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St Andrews Est-SY030929 REQUEST FOR A CONDITIONAL LETTER OF MAP REVISION FOR FILL (CLOMR-F) o~ DENTON CREEK (OLO DENTON CREEK) 1N THE CITY OF COPPELL DALLAS COUNTY, TEXAS PROJECT: ~I~ANII~/gWS ESTATES Prepared for: St. Andrews Land Company Ltd. - Holmes Builders, Inc. 1406 Halsey Way Suite 100 Carrollton, Texas 75007 Prepared by: Evans Engineering 1417 W. Main Street, Suite 100B Carrollton, Texas 75225 September 29, 2003 - REQUEST FOR (CLOMR-F) -- ST. ANDREWS ESTATES B. C. D. E. F. G Appendix Appendix Appendix Appendix Appendix Appendix Appendix Appendix Appendix Appendix TABLE OF CONTENTS SECTION I -- Narrative General Purposes of Study and Report Site Description Topography Hydrology Hydraulics Results and Conclusions List of Fi,qures Figure I Location Map - City of Coppell (Source: Dallas Co. Appraisal District) Figure 2 Vicinity Map (Source: Dallas Co. Appraisal District) Figure 3 Map of Neighboring Developments (Source: Dallas Co. Appraisal District) Figure 4 Topographic Maps (Extracts of Carrollton quadrangle, 1:20,000 & 1:10,000) SECTION II - FEMA Application/Certification Forms · MT-1 Form 1 - Property Information Form · MT-1 Form 2 - Elevation Form · MT-1 Form 3 - Revision Requester and Community Official Form APPENDICES - Technical Data A - Preliminary Plat, "St. Andrews Estates," August 26, 2003 B - Grading Plan, "St. Andrews Estates," August 21, 2003 C - LOMR No. 97-06-503P, July 23, 1997 D - Topographic Map (1" = 200') -- Cross-section stations and area of fill E - Cross-Sections (HEC-RAS output) F- Flood Plain Surface (HEC-RAS output) G - Table of Water Surface Elevations, Existing and Proposed (HEC-RAS) H - Extract of FIRM Panel 480170 0010 E, revised July 23, 1997 Showing the requested map revision I - HEC-RAS Output (Report) J - HEC-RAS Input Files (3.5" Disk) REQUEST FOR A CONDITIONAL LETTER OF MAP REVISION (CLOMR) OLD DENTON CREEK PROJECT: "ST. ANDREWS ESTATES" A. General The subject development proposes filling a portion of the flood plain of Old Denton Creek and creating building lots, as shown by the attached plat (Appendix A.) The City of Coppell requires a hydraulic study odor to filling any delineated flood plain. This study wes undertaken to provide the necessary technical data for issuance of a Conditional Letter of Map Revision (CLOMR) for flood plain reclamation along Denton Creek in the City of Coppell, Dallas County, Texas, as shown by the Grading Plan at Appendix B. The required forms for this "Request for a Conditional Letter of Map Revision" ara included in Section II. The technical information is provided as Appendices. B. Purposes of Study and Report The purpose of this study is a determination of the effects of filling the flood plain of Old Denton Creek. An objective of this report is to provide all necessary information for obtaining a Conditional Letter of Map Revision (CLOMR) from the Federal Emergency Management Agency. C. Site Description "St. Andrew's Estates" is a proposed residential subdivision that includes a cul-de-sac street. The site touches on the southern banks of Old Denton Creek about 1000 feet downstream of MacArthur Blvd. The ten-acre site was originally developed by the City of Coppell as a service center (warehouse and shops) and was sold to Holmes Builders, Inc. in 2002. D. Toooaraohv A small tributary meanders through the subject property and enters the flood plain of Denton Creek/Old Denton Creek, creating a small appendage to the flood plain. This is evident in the quadrangle maps shown at Figures 4a and 4b. As documented by the referenced LOMR, there is a split in the channel just upstream of MacArthur Bird where a portion of the flow in Denton Creek enters the old channel, called "Old Denton Creek." The newer channel was created by a Corps of Engineers project with the old channel left to help carry less frequent, larger flows. E. Hydrology Denton Craek's contributory wetershed area at a point just below its confluence with Cottonwood Branch is 19.45 square miles with a peak discharge of 21,300 cfs for the 100-year storm event, according to the FIS. The referenced LOMR documented a split in flow at the divergence of Old Denton Creek, such that the 100-year flood peak discharge in the latter channel is determined to be 4000 cfs. F. Hydraulics (Appendices E, F, G, I and J) The effective model was adopted in its entirety from LOMR No. 97-06-503P, July 23, 1997. The data for the Old Denton Creek hydraulic model was obtained from Ms. Teresa Turner of the Department of Engineering and Public Works in digital format. The data was imported to HEC-RAS format and matched with the output produced in 1997. Three cress-sections were added to the input in order to model the flood plain in the small tributary appended to Old Denton Creek's channel. One of the new cross-sections (Sta 236+00) lines up with the small tributary and cross-sections were selected just upstream and downstream of its confluence with Old Denton Creek. Analyses of the hydraulic characteristics of channel were performed with the USACE's HEC-RAS program (ver. 3.1.1.) By this model the probable water surface elevations along the creek for the 100-year storm event were determined and compared for the existing (pre-development) and proposed conditions. Refer to Appendix G in two pages. Appendix F is an orthogonal view of the channel with the surface of the flood plain modeled. G. Results and Conclusions Comparing the flood elevations for the existing and proposed conditions, the greatest change between the two outputs was a difference of 0.03 feet (3~8 inch) at Station 236+00 lower for the proposed conditions. This can be explained by the action to remove an expansion and contraction which serves to increase the flow rate in the narrower channel. However, the floodway is not altered at all. Based on the study output, the following conclusions can be made: The proposed grading (Grading Plan, Appendix B) will not cause additional flooding at any location along Old Denton Creek. The CLOMR should be approved as shown by Appendix H. . _.... , ...... , k..., r,„ AIL keip % , /i<i- , iv itab. 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'Zs” A' ••• .7 4*.: ' * ••::$iSISA * -••--....—..kagitilli: II.:,' I . . 0 0.3 0.6 0.9 1.2 1.5 km N . . G 0 0.2 0.4 0.6 0.8 1 m i Map center is UTM 14 690067E 3651533N (NAD27) Carrollton quadrangle Projection is UTM Zone 14 NAD83 Datum MN=3.995 GN--...-1.108 Figure 4a-- Topographic Map (Extract of Carrollton quadrangle, 1:20,000) topozone • ' n,-.2„-it 1•44,,41 :"i Mv,,....0 I'4 r i 1 if ii t (ZZ ) \\ if ft �„ '.. —-- iii * " . \'''' ':...,. , 4. ,_.......,, „-...:.............;; . ,. i f v '----'-\\. . ,• PROJf✓GT 0 _ • Ill , _V--- S l'c� `� \'', 13'1 14 ' AO 7 t �- 6 454 ' D ?oats 2ciA= - - -- f ( ,t " i• \ i n»s.*• f *,0 ('rr -,',,t,, F • - ,! -11 1 l-1'0 C411/ ,. + 0. ',• ,- \.,\, '+e...,,,o;if>,'11?4 a I r / ; j , , 0 0.1 0.2 0.3 0.4 01.5 km N 0 0.1 0.2 0.3 0.4 0.5 mi GN Map center is UTM 14 690067E 3651533N (NAD27) Carrollton quadrangle Projection is UTM Zone 14 NAD83 Datum MN-3.995 GN=-1.108 Figure 4b-- Topographic Map (Extract of Carrollton quadrangle, 1:10,000) FEDERAL EMERGENCY MANAGEMENT AGENCY [ 0.~1.1~. NO. $0~?-0147 J PROPERTY INFORMATION FORM E,,~,v. s~r,,.~ ~o, ~oos PAPERWORK BURDEN DISCLOSURE NOTICE Public reporting burden for this form is estimated to average 1.63 hours per response. The burden estimate includes the time for reviewing instructions, searching existing data sources, gathering and maintaining the needed data, and completing, reviewing, and submitting the form. You are not required to respond to this collection of information unless a valid OMB control number appears in the upper right corner of this form. Send comments regarding the accuracy of the burder~ estimate and any suggestions for reducing this burden to: Information Collections Management, Federal Emergency Management Agency, 500 C Street, SW, Washington DC 20472, Paperwork Reduction Project (3067~147). Submission of the form is required to obtain or retain benefits under the National Flood Insurance Program. Please do not send your completed survey to the above address, This form may be completed by the property owner, property owner's agent, licensed land surveyor, or registered professional engineer to support a request for a Letter of Map Amendment (LOMA), Conditional Letter of Map Amendment (CLOMA), Letter of Map Revision Based on Fill (LOMR-F), or Conditional Letter of Map Revision Based on Fill (CLOMR-F) for existing or proposed, single or multiple lots/structures. Please check the item below that describes ~,our request: A letter from FEMA stating that an existing structure or parcel of land that has not been elevated by fill [] LOMA (natural grade) would not be inundsted by tfie base flood- A letter from FEMA stating that a proposed structure that is not to be elevated by fill (natural grade) ] CLOMA would not be inundated by the base flood if built as proposed~ A letter from FEMA eteting that an existing structure or parcel of land that has been elevated by fill [] LOMR-F would not be inundated by the bese flood. A letter from FEMA stating that a parcel of land or proposed structure that will be elevated by fill ] CLOMR-F would not be inundated by the base flood if fill is placed on the paroel as proposed or the structure is built as proposed. Fill is defined as material from any source placed to raise the ground to or above the Base Flood Elevation (BFE). The common construction practice of r~-moving unsuitable existing material (topsoil) and backfilling with select structural material is not considered the placement of fill if the practice does not alter the existing (natural grade) elevation, which is at or above the BFE. Fill that is placed before the date of the first National Flood Insurance Program (NFIP) map showing the area in a Special Flood Hazard Area (SFHA) is considered natural grade. Has fill been placed on your property? [] Yes [] No If yes, when was fil~ placed? Octj1997 month/year Will fill be placed on your property? [] yes [] No If yes, when will fill be placed? Janl2004 month/year Street Address of the Property (if request is for multiple strostures, please attach additional sheet): 732 Deforest, Coppell, Dallas County, Texas 2. Legal description of Property (Lot, Block, Subdivision) (if a street address cannot be provided): Current description: Gilbett Woolsey Survey (Abstract No. 1792), Tract 1 Proposed description: St. Andrews Estates Addffion 3. Are you requesting that the SFHA designation be removed from (check one): ] the entire legally recorded property? ] a portion of land within the bounds of the property (a certified metes and bounds description and map of the area to be removed, certified by a licensed land surveyor or registered professional engineer, are required)? ] structures on the property? What are the dates of construction? 4~ is this request for a (check one): [] single structure ] single lot ] multiple structures (How many structures are involved in your request? List the number: ) ] multiple lots (How many lots are involved in your request? List the number: 6) FEMA Form 81-87, SEP 02 Property Information Form MT-1 Form 1 Page I of 2 addition to this form (MT-I Form 1), ALL requests must include the following: · Copy of the Plat Map for the property (with recordation data and stamp of the Recorder's Office) OR · Copy of the property Deed (with recordation data end stamp of the Recorder's Office), accompanied by a tax assessor's map or other certified map showing the surveyed location of the property relative to local streets and watercourses · Copy of the effective FIRM panel and/or Flood Boundary and Floodway Map (FBFM) (if applicable) on which the property location has been accurately plotted (property Inadvertently located in the NFIP regulatory floodway will require Section B of MT-1 Form 3) · Form 2 - Elevation Form. If an Elevation Certiflcste has already been completed for this property, it may be submitted in addition to Form 2. Pisese include a map scale and North arrow on all maps submitted. For LOMR-Fa and CLOMR-Fa, the following must be submitted in addition to the items listed above: · Form 3 - Community Acknowledgment Form pr~c~no Fee (ese instructions for appropriate mailing sddrees; or, visit http:llwww.fema.govlfhmlfrm_fees, shtrn for the most current fee schedule) Revised fee schedu es ars published periodically but no more than once annually, aa noted in the Federal Resister. Please note: single/multiple Ict(a)/structure(s) LOMAs ers fee exempt. The current review and processing fees are listed below: Chock the fee that applies to your request: r~ $325 (single lot/structure LOMR-F fctlowing a CLOMR-F) E~ $425 (single lot/structure LOMR-F) --I $500 (single lot/structure CLOMA or CLOMR-F) r~l $700 (multiple lot/structure LOMR-F following a CLOMR-F, or multiple Ict/structure CLOMA) [~ $800 (multiple Iot/strccture LOMR-F or CLOMR-F) Pleess submit the Payment Information Form for remittance of applicable fees. Please make your check or money order payable to: National Flood All documents submitted in support of this request are correct to the best of my knoWledge. fine or imprisonment under Title 18 of the United States Code, Section 1001. Applicant's Name: John David Evans, P.E. Please Print or Type Mailing Addrees: 1417 W. Main Street, #1(}OB Carroliton, Texas 75006 E-Mail Addrsee: evaneengr~comcaat.com (optlonsi) September 29, 2003 Date I understand that any false statement may be punishable by Company: Evans Engineering (sole proprietorship) Daytime Teisphone No.: (214) 929-2763 Fax No.: (972) 594-8263 If you have any questions concerning FEMA policy, or the NFIP In general, please contact the FEMA Map Assistance Center toll free st 1-877-FEMA MAP (1-877-336-2627), or visit the Flood Hazard Mapping webstte at www.fema.gov/ff~rnL FEMA Form g1~7, SEP 02 Property Information Form MT-1 Fomt 1 Page 2 of 2 PAPERWORK BURDEN DISCLOSURE NOTICE Public repotting burden for this form is estimated to average 1 hour per response. The burden est[mate includes the time for reviewing instructions, searching existing data sources, gathering and maintaining the needed data, and completing, reviewing, and submitting the form. You are not required to respond to this coilsction of information unless a valid OMB control number appears in the upper right comer of this form. Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to: information Collections Management, Federal Emergency Management Agency, 500 C Street, SW, Washington DC 20472, Paperwork Reduction Project (3067-0147). Submission of the form is required to obtain or retain beneflts under the National FIood lnsurance Pr ram. Please do not send ourcom letedsmve to the above addmss- This form must be completed for requests and must be completed and signed by a registered professional engineer or licensed land surveyor. A FEMA National Flood Insurance Program (NFIP) Elevation Cemtificate may be submitted in addition to this form for single structure requests. For requests to remove a structure on nstural grade OR on engineered fill from the Special Flood Hazard Area (SFHA), submit the lowest adjacent grade (the lowest ground touching the structure), including an attached deck or garage. For requests to remove an entire parce~ of land from the SFHA, provide the lowest lot elevation; or, if the request involves an area described by metes and bounds, provide the lowest elevation within the metes and bounds description. 1. NFIP Community Number: 480170 Property Name or Address: St Andrews Estates; 732 Deforest Road, Coppell, TX 2. Are the elevations listed below based on [] e_xjst nR or [] proposed conditions? (Check one) 3. What is the elevation datum? NAD 82 If any of the elevations listed below were computed using a datum different than the datum used for the effective Flood Insurance Rate Map (FIRM) (e.g., NGVD 29 or NAVD 88), what was the conversion factor? Local Elevation +1- fl. = FIRM Datum 4. For the existing or proposed structures listed below, what are the types of construction? (check ail that apply) [] crawl space [] slab on grade [] basement/enclosure [] other (explain) 5. Has FEMA identified this area as subject to land subsidence or uplift? (see instructions) [] Yes [] No If yes, what is the date of the current releveling? / (month/year) Lowest Block Lowest Lot Adjacent Base Flood For FEMA Use Only Lot Number Number Elevation Grade To Elevation Structure 5 A 454.5 455.0 452.9 6 A 4~.~ ~5~.5 452.9 ~ ~ 454'8 455.5 452.~ ~ This certification is to be signed and seated by a licensed land surveyor, registered professional engineer, or architect authorized by law to certify elevation information. All documents submitted in support of this request are correct to the best of my knowledge. I understand that any false statement may be punishable by fine or imprisonment under Title 18 of the United States Code, Section 1001. Certifier's Name: Peter F. Hennessey, RPLS License No.: 3740 Expiration Date: 12131/2003 Company Name: Hennc",.=~e~' Engineering, inc. Telephone No.: 972-245-9478 Fax No.: 972-245-7087 ii...P. ETER HENNESSE~' FEMA Form 81.87A, SEP 02 Elevation Form MT-1 Form 2 Page I of 2 Lot Number Block Number A 16 A 17 A Lowest Lot Elevation 454.2 445.5 Continued fi.om page t. Lowest Base Flood For FEMA Use Only Adjacent Grade Elevation To Structure 455.0 452.9 455 452.9 This certification is to be signed and sealed by a ;ensed land surve or, registered professional engineer, or architect authorized by law to certify elevation information. All documents submitted in support of this request are correct to the best of my knowledge. I understand that any false ~ates Code, Section 1001. . ........... ~~ation Date: 1Z/~llU~ FEMA Form gl-87A, SEP 02 Elevation Form MT-1 Form 2 Page 2 of 2 I FEDERAL EMERGENCY MANAGEMENT AGENCY [ o.~,.~o, s0,~.0,,z I COMMUNITY ACKNOWLEDGMENT FORM E.~ir~ S~t, mb~ $O, 2005 PAPERWORK BURDEN DISCLOSURE NOTICE Public reporting burden for this form is estimated to average 0.88 hour per response. The burden estimate includes the time for reviewing instructions, seamhing existing data soumes, gathering and maintaining the needed data, and completing, reviewing, and submitting the form. You are not required to respond to this collection of information unless a valid OMB control number appears in the upper rignt corner of this form. Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to: Information Collections Management, Federal Emergency Management Agency, 500 C Street, SW, Washington DC 20472, Paperwork Reduction Project (3067-0147). Submission of the form is required to obtain or retain benefits under the National Flood Insurance Program. Please do not send your completed survey to the above address. This form must be complated for requests involving the existing or proposed placement of fill (complete Section A) OR to provide acknowledgment of this request to remove a property from the SFHA which was previously located within the regulatory floodway (complete Section B). This form must be completed and signed by the official responsible for floodplain management in the community. The community number and the subject property address must appear in the spaces provided below. Community Number: 480170 Property Name or Address: St Andrews Estates; 732 Deforest Road, Coppell, TX A. REQUESTS INVOLVING THE PLACEMENT OF FILL As the community official responsible for floodplain management, I hereby acknowledge that we have received and reviewed this Letter of Map Revision Based on Fill (LOMR-F) or Conditional LOMR-F request. Based upon the community's review, we find the completed or proposed project meets or is designed to meet all of the community floodplain management requirements, including the requirement that no fill be placed in the regulatory floodway, and thst al~ necessary Federal, State, and local permits have been, or in the case of a Conditional LOMR-F, will be obtained. In addition, we have determined that the land and any existing or proposed structures to be removed from the SFHA are or will be reasonably safe from flooding as defined in 44CFR 65.2(c), and that we have available upon request by FEMA, all analyses and documentation used to make this determination. For LOMR-F requests, we understand that this request is being forwarded to FEMA for a pos-~ble map revision. Community Comments: Community Official's Name and Title: (Please Pdnt or Type) Telephone No.: Kenneth M. Griffin, P.E., Director of En~lineerin~ and Public Works (972) 304-3686 Community Name: Community Official's Signature: (required) Date: City of Coppell B. PROPERTY LOCATED WITHIN THE REGULATORY FLOODWAY As the community official responsible for floodplain management, I hereby acknowledge that we have received and reviewed this request for a LOMA. We understand that this request is being forwarded to FEMA to determine if this property has been inadvertently included in the regulatory floodway. We acknowledge that no fill on this property has been or will be placed within the designated regulatory floodway. We find that the completed or proposed project meets or is designed to meet all of the community floodplain management requirements, Community Comments: Community Official's Name and Title: (Please Print or Type) Telephone No.: ! Community Name: Community Official's Signature (required): Date: FEMA Form 8t-87B, SEP 02 Community Acknowledgment Form MT-t Form 3 Page t of I I II � p PRESTWICK VOL. 2001208 PG, 0937 D. R. D.C.T. ZONED: SF -12 FUTURE STREET R.O.W. STONEWICK LANE J THE PENINSULAS OF COPPELL 0 s / VOL. 96209, PG. 3323 N05' 13'09 "E rp 5> D. R. D.C.T. 24.04' N20'49'22 "E GUADALUPE AND ANGELITA ESTRADA ZONED: SF -9 PD132 28 71 VOL. 96239 PG. 1250 D. R. D.C.T. i I ZONED: SF -12 20' U.E. EXISTING FLOODPLAIN TO VOL. 958 PG. 917 BE REMOVED EXISTING FLOODPLAIN N40'1 2'08 "W D.R.D.C.T. TO REMAIN 60.41' ��p ��0� 13,p6 NORTH 1019.68' 36 95.73' - r a5.so'- - - as.00' - - - s7.00' -'1 - _ _ ti3Q. N09'15'03 "W 10' U.E., LANDSCAPE, 36.77' I 95.00' I 90.00' _ 180.00' 88.00- - - - 116.69' pp• 27.07' \ �2•RF WALL MAINT. & D.E. I _ __ T 6> p � 'rte to �20' B.L. BL I 20' B.L. 20' B.L. 20' B.L. 20' B.L. gb' I 20' B.L. 20' B.L. 6S� 6> 159 "pFN 15-00, NO1'29'58 "E a `� /- ' J I I O 20' B.L. B. . S n 1m 23 �IaI I� 22 I I ( R. W. 1 ( m / F // I 9 �` Z 2 30.00' w 24, 3 W I 1 20' U.E. & D.E. J � � I i 0 / M m a I n I 5 O.p N06'04' N12 m m a 21 I',� I I _ Ic� I-I // a -j 700 0' S8 "E N09.0p, 120 gg' / 12,460 SF 1 12.170 SF '12,239 SF J I - m '"�i m / e // I IM o' 01 "E ro - n m m 17 / 16 10 io 15 _ 00 m� I� rn m 60. In Im mI I 20 ° °' 19 m I 1 g / 60.00�� "��Z0.00' / z m�I 1 13.335 SF I 12,945 SF I I I (1 1 20,414 SF / / 19,620 SF zpoo' / a I L30' B.L. I I�I I L- I o) I 1 113.433 SF /// ,.. i // I 27,690 SF \. -. i ... S ` I 30' B.L. I 30' B.L. I _N90'00'00 "E 30.00' 27 07 / I P I I I 1 / ryh // 50.00' O o 30 B.L. 30 B.L L J I DOI I I 30' B.L. T 100 YEAR FLOODPLAIN, ZONE X, 0 0 10' U.E. 7.547.35 _ - J 30' B.L. I % �h // 30' B.L. _ J / �0° I / I o RAINTREE VILLAGE I I 78 23 1 t.suo 0.85' �1o>_u. E. -i0'�E e f - L 30' B.L. / / -� _� 24.89' - / l _ ACCORDING TO FIRM COMMUNITY t Q C8 10' U.ET_ 97.21' 85,09' w SBi _ 1 �/ / 10' U.E. - - - 177.04' - - o�\ c� z PANEL #480170 0010E DATED VOL. 86132, PG. 231 1 I O I T2 46.36 - 72.69 - - - - _ _ _ _ , o g I JULY 23, 1997 D. R. D.C.T. I K�!t, C7 _ _ - - T3 1 tir 79.59 - 74.60' _ _ _ S36'42'53 "E rn - ZONED: SF PD 137 T4 - - 85. 09.28'_ _ - - - 41.99' ' a w / N .00' s> NORTH - - - C4 -. 3 0.92' - -/� o w o _ c3 ,a _ - / - r _ C6 _ m o 14 -00 r� M .00 192.83' ST. ANDREWS LANE -. - - -_ _ / - - - _ ��05� , ' of o ° 23,662 SF o o Nl O i 24X I _ CS - N2� �2 poi I ° ST. ANDREWS MANOR 7 ° o �IcV W I T7 c2 _ _ _ _ s2.sa' 1o'�u.E._ss_to'_ / _ _ �� I ANDREW SPEAR o Co Go r> o _ _ 39,46 95.16' 95.14 VOL. 4397 PAGE 01075 G1 4.36_ 73.535_ - eI �54.jZ 8 / -�_- -� -- I �- �n 78.23' 24.89' 11.60' 30' B.L. 9 .1� 56_19'_ +- 10' U.E. 48.07' '"�� ����• 1 _ - - _ 95.1 t' _ I I 4th /J8' m I DATE: 08 -05 -99 ~i M irF 10' U.E. 7.54' 17.35' 30' B.L. 30' B.L. 30' B.L. 30' B.L. s -_ 30' B.L. I 3_� / \ 9� l _ �- -1 (- -1 I i - 30' BL ' Z �y. 0) VOL. 2001044 PAGE 03714 I 30' B.L. I rn \ 30' B.L 30' B I C` p/ \ N DATE: 05 -25 -00 20' U.E. & D.E. vl \, I I 30' BL I N 6 \\ -, , �1 �1 III I, ;-�,� �I� III III �I1 -�ot5 R.O.W. DEDICATION o 2,4610 �� 1 2 3 4 m 5 �p Imp 7 g r I J JAI I m n°i 13 w 1 � m \� M m1 SF J� m12,170 SF JIa 1 ,428 SF h (14,810 SF I 1 14,626 SF °' I 6 IO� X13,027 SF to 10 12,962 SF ��ml h 13,718 SF of h 14,566 SF � I Im 14,587 SF Io 14,051 SF �'rn 20,419 SF 0.287 AC. m o m m co 13,880 SF _ I I� aOIMI Fo m1 I (-00 roI I mI 1 mfr I m al EXISTING FLOODPLAI1- I I I I �� 00 10' U.E., LANDSCAPE, I �,, f 0 I I 1.0 100 YEAR F(� I I I� I 1'� _ I � OODPLAIN =452.9 N o - J I 5 ?0'_BL 20' BL SE FILLED B� I 20' BB 20' 8L I o I I O N 20' BL J 20' BL J L 20' BL 20' BL L MIN. FINtSHEp FL020' BL 5 6 L 20' BL I L 20_BL_ WALL MAINT. & D.E. _ I � I � � 20' BL 1 F J -- �� 36.77' 95.73' 85.50' 85.00' I 97.00' _ - 95.00' 95.00 95.00' 95.00' 95.00' L - 95.00 95.00' _ 170.84' _ -- - -- -- - - - _ 153.00' 303.00' TO 20' U.E. - - - - - - - - - - - - - - - I I NORTH 1328.84' � 0 0 I ( -- -- - - - - 1 C -- -- - - - - - - -- -- SOUTH 1687.92' _ _I STATE OF TEXAS )( COUNTY OF DALLAS )( WHEREAS ST. ANDREWS LAND COMPANY, LTD. is the owner of a-tract of - #and situated 'in lttre Wiliiam A. Trimble Survey, Abstract No. 1268, Map Records, Denton County, Texas, now being Abstract No. 1791 in the City of Coppell, Dallas County, Texas, and being more particularly described as follows: COMMENCING at a found 3/4" iron rod, at the intersection of the center line of MacArthur Boulevard (100' R.O.W.) and the south survey line of the William A. Trimble Survey; 1 THENCE, East, along the south survey line of said William A. Trimble Survey, a distance of 557.68 feet to the POINT OF BEGINNING ; THENCE, North, at 36.77 feet passing a 112" found iron rod, at 940.0 feet passing a 112" set iron rod, in all a distance of 1019.68 feet to a point in the center line of Denton Creek for a corner; THENCE, along said Denton Creek center line, meanders the following courses and distance; North 34' 00' 00" East, 67.59 feet; North 15' 00' 02" East, 70.00 feet; North 06' 04' 58" East, 60.00 feet; North 09' 00' 01 " East, 70.00 feet; North 01' 29' 58" East, 30.00 feet; North 09' 15' 03" West, 27.07 feet to a point for corner; THENCE, East, at 46.83 feet passing a 1/2" set iron rod, in all a distance of 270.61 feet to a 112" set iron rod for a corner; THENCE, South, at 1292.07 feet passing o 1/2 " found iron rod, in all a distance of 1328.84 feet to a point in the said south survey line of the said William A. Trimble Survey, for a corner; THENCE, West, along said south survey line, a distance of 340.27 feet to the POINT OF BEGINNING and containing 435,601 square feet or 10.000 acres of land. Word /2003 /JO324Survey. doc NOW, THEREFORE, KNOW ALL MEN BY THESE PRESENTS: THAT ST. ANDREWS LAND COMPANY, LTD., acting herein by and through it's duly authorized officers, do hereby adopt this plat designating the hereinabove described property as ST. ANDREWS ESTATES, an addition to the City of Coppell, Texas and do hereby dedicate to the public use forever, the streets and alleys, shown thereon. The Easements shown hereon are hereby reserved for the purpose as indicated. No Buildings, fences, trees, shrubs or other improvements or growths shall be constructed or placed upon, over or across the "Utility Easements" as shown. Said "Utility Easements" being hereby reserved for the mutual use and accommodation of all public utilities desiring to use or using same. All and any public utility shall have the right to remove and keep removed all or parts of any buildings, fences, trees, shrubs, or other improvements or growths which may in any way endanger or interfere with the construction, maintenance or efficiency of its respective system on the "Utility Easements" and all public utilities shall at all times have the full right of ingress and egress to or from and upon the said "Utility Easements" for the purpose of constructing, reconstructing, inspecting, patrolling, maintaining and adding to or removing from all or parts of its respective system without the necessity at any time of procuring the permission of anyone. Witness my hand at Coppell, Texas this the - _ - - - -- day of ----- - - - - -, A.D., 2003 ST. ANDREWS LAND COMPANY, LTD By. ------ - - - - -- TERRY HOLMES DALLAS COUNTY )( STATE OF TEXAS )( BEFORE ME, THE UNDERSIGNED AUTHORITY, A NOTARY PUBLIC IN AND FOR THE SAID COUNTY AND STATE, ON THIS DAY PERSONALLY APPEARED TERRY HOLMES, KNOWN TO ME TO BE THE PERSON WHOSE NAME IS SUBSCRIBED TO THE FOREGOING INSTRUMENT, AND WHO ACKNOWLEDGED TO ME THAT HE EXECUTED THE SAME IN THE CAPACITY THEREIN STATED. GIVEN UNDER MY HAND AND SEAL OF OFFICE THIS - - - - -- DAY OF ----------------- 2003. NOTARY PUBLIC IN AND FOR THE STATE OF TEXAS MY COMMISSION EXPIRES: SURVEYOR'S CERTIFICATE I, PETER F. HENNESSEY, REGISTERED PROFESSIONAL LAND SURVEYOR, HEREBY CERTIFY THAT I HAVE PREPARED THIS PLAT FROM AN ACTUAL ON- THE - GROUND SURVEY OF THE LAND, AND THAT THE CORNER MONUMENTS SHOWN THEREON WERE PROPERLY PLACED UNDER MY PERSONAL SUPERVISION IN ACCORDANCE +WITH THE PLATTING RULES AND REGULATIONS OF THE CITY OF CARROLLTON, TEXAS. PETER F. HENNESSEY, RPLS NO. 3740 DALLAS COUNTY )( STATE OF TEXAS )( BEFORE ME, THE UNDERSIGNED AUTHORITY, A NOTARY PUBLIC IN AND FOR THE SAID COUNTY AND STATE, ON THIS DAY PERSONALLY APPEARED PETER F. HENNESSEY, KNOWN TO ME TO BE THE PERSON WHOSE NAME IS SUBSCRIBED TO THE FOREGOING INSTRUMENT, AND WHO ACKNOWLEDGED TO ME THAT HE EXECUTED THE SAME IN THE CAPACITY THEREIN STATED. GIVEN UNDER MY HAND AND SEAL OF OFFICE THIS ------ - DAY OF --------- - - - - -- 2003. I NOTARY PUBLIC IN AND FOR THE STATE OF TEXAS MY COMMISSION EXPIRES: -_ Of , o the City o z < action, then and there accepted the dedication of streets, alleys, parks, g water and sewer lines, as shown and set forth in and upon Y 0 w Mayor to note the acceptance thereof by signing � O w 0 Witness my hand this - - - - -- day of ---------- o Co W Of a ft� m ]�E 06' 10' 13" m a- N v NO3'05'07 "W 75.35' DEFOREST ROAD 14'13'05" 1000' c U SITE �s a 247.52' LEGEND: U.E. = UTILITY EASEMENT D.E. = DRAINAGE EASEMENT VICINITY MAP LMANAGER: PLAT N.T.S. SERVER: /DRAWIN( STRATFORD MANOR VOL. 2000034 PG. 0147 D.R.D.C.T. RECOMMENDED FOR APPROVAL Chairman, Planning and Zoning Commission City of Coppell, Texas Approved and Accepted: 60 30 0 60 120 150 SCALE IN FEET Notes: 1" 60 1. Maintenance of Lot 24X common area will be the responsibility of the Home Owners Association. 2. The City of Coppell will have no responsibility for maintenance of the floodway /floodplain areas as shown hereon; however, the City does have the authority to regulate activity in the flood way /f load plain as per the City's Floodplain Ordinance. The maintenance of these areas shall be the sole responsibility of the individual owners) adjacent to said areas. Mayor These areas are to remain free of improvements that may obstruct the City of Coppell, Texas flow of stormwater and protected from potential erosion by the owners. No fences will be allowed in the floodplain, along with any other The undersigned, the City Secretary to the City of Coppell, Texas hereby certifies that the foregoing structures as per the City's Floodplain Ordinance. amending plat of ST. ANDREWS ESTATES Addition to the City of Coppell was submitted to the City Council on the _ - - - -- day of ---------- - - - - -, 200_, and the Council, by formal action, then and there accepted the dedication of streets, alleys, parks, easements, public places, and water and sewer lines, as shown and set forth in and upon said plat, and said Council further authorized the Mayor to note the acceptance thereof by signing his /her name as hereinabove subscribed. 12.87' Witness my hand this - - - - -- day of ---------- - - - - -, A.D., 2003 C3 City Secretary Floodplain Development Permit Application No. _ Coppell floodplain administrator on --- - - - - -_ Floodplain Administrator ------ - - - - -_ - LINE TABLE LINE BEARING LENGTH TI N45'00'00 "W 14.14' T2 S45'00'00 "W 14.14' T3 N42'49'35 "W 13.60' T4 S48- 5V30 "W 15.06' J0324 /JO34.DWG has been filed with the City of ---------- 2003 _ -- Date CURVE TABLE CURVE DELTA RADIUS TANGENT LENGTH CHORD BRG. CHORD C1 35'39'33" 40' 12.87' 24.89' N17 *49'46 "W 24.49' C2 35'39'33" 40' 12.87' 24.89' N17'49'46 "W 24.49' C3 06' 10' 13" 700' 37.73' 75.38' NO3'05'07 "W 75.35' C4 14'13'05" 1000' 124.72' 248.15' N00'56'20 "E 247.52' C5 16'05'44" 1000 141.39' 280.92' N00'00'OO "E 280.00' C6 16 °05'44" 1000 141.39' 280.92' N00-00'00 "E 280.00' C7 35'39'33" 40' 12.87' 24.89' 517'49'46 "W 24.49' C8 35'39'33" 40' 12.87' 24.89' S17'49'46"W 24.49' C9 180'00'00' 4' N/A 12.57' N9900'00 "W 8.00' C10 180100'00' 4' N/A 12.57' N90'00'00 "W 8.00' C11 60'17'113" 175' 101.62' 184.14' N30'08'36'W 175.76' C12 32'24'47" 275' 79.93' 155.57' N44'04'49 "W 153.51' THIS PLAT CORRECTLY PRESENTS THE REQUIRED EASEMENTS FOR THIS DEVELOPMENT. Verizon Telephone ------ _ TXU Gas Comcast Oncor Energy Delivery ___ -___--------- A PRELIMINARY PLAT OF LOT 1 TO LOT 24X, BLOCK 2 ST. ANDREWS ESTATES AN ADDITION TO THE CITY OF COPPELL WILLIAM A. TRIMBLE SURVEY, ABSTRACT NO. 1791 DALLAS COUNTY, TEXAS OWNER: ST. ANDREWS LAND COMPANY LTD. PREPARED BY: TERRY HOLMES, MANAGER HENNESSEY ENGINEERING, INC. HOLMES BUILDERS, INC. 1417 W. MAIN STREET #100 1406 HALSEY WAY #100 CARROLLTON, TX 75006 CARROLLTON, TEXAS 75007 PH: (972) 245_9478 PH: (972) 221 - 8326 FAX: (972) 245 -7087 FAX: (972) 242 -2931 CITY FILE No. XX -XXXXX AUGUST 2003 SCALE: 1 " =60' JOB No.0324 APPENDIX A � � � � � - - 1 .. _ __.. .> </1y+1 t c � � - - i� rud. �..1 F � .7 ,.'r..- �.. - -�-�a ,....,� -_ _,. • �, t �B� wvc- �: =::.� `�,. > --a. "., _�. �.,.° _ -y �•�_ - •.'��-,<:. �a - -._, � >. - ..,�:.; g,�. �., �.. - �^- �"'.:_�..�� -.,._. ..... �� _ ....., -° i' -. �;,��11 I I I I I I I i I I I I I I ( I 465 455 450 A "M !?i!Pedet:al Emergency Management Agency ~]i' Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 97-06-503P The Honorable Candy Sheehan Mayor, City of Coppell 255 Parkway Boulevard Coppelt, Texas 75019 Community: City of Coppell, Texas Community No.: 480170 Panel Aff'ected: 0010 E Effective Date of This Revision: JULtI31997 102-1~A-C Dear Mayor Sheehan: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flo{xl Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated May 6, 1997, Ms. Sabine Borgnet-Harris, Halff Associates, Inc., requested that FEMA revise the FIRM and F1S report to show the effects of corrections to the effective hydraulic analysis and effective FIRM and FIS report along Denton Creek t¥om just downstream of the convergence to approximately 1,450 feet upstream of the divergence of Old Denton Creek and along Old Denton Creek from it5 convergence with to its divergence from Denton Creek. The corrections made as part of this revision are listed below. The efl'~:ctive hydraulic analysis shows Denton Creek and Old Denton Creek share a common floodplain. This study is incorrect because high ground separates Denton Creek from Old Denton Creek so that each stream has its own floodplain. As part of this revision, the effective hydraulic analysis was separated so that each stream has its own hydraulic analysis. The effective floodway analyses for Denton Creek and Old Denton Creek showed floodway topwidths that were greater than the topwidths of the floodplain of the flood having a l-percent chance ol being equaled or exceeded in any given year (base flood). The topwidths were corrected as part of this revision. The effective floodway analysis for Old Denton Creek showed floodway topwidths that did not match those shown on the effective FIRM. These discrepancies were corrected. The cross-sectional distances shown in the effective hydraulic analyses along the revised reach for both Denton Creek and Old Denton Creek did not match the distance shown on the effective FIRM and Flood Profile panels 0BP, 09P, and 1 IP. These discrepancies were corrected. The configuration of Denton Creek and Old Denton Creek in the effective hydraulic analysis did not match the configuration shown on the effective FIRM. Minor changes were made to the geometry at Cross Sections 23800, 24400, and 24700 to correct this discrepancy. All data required to complete our review of this request were submitted with letters from Ms. Harris. Because this Letter of Map Revision (LOMR) is being issued to correct a mapping or study analysis error, fees were ndt assessed for the review. APPENDIX C 2 We have completed our review of the submitted data and the flood data shown on the effective FIRM and report. We have revised the FIRM and FIS report to modify the elevations and the floodplain and floodway boundary delineations of the base flood along Denton Creek from just downstream of the convergence to approximately 1,450 feet upstream of the divergence of Old Denton Creek and along Old Denton Creek from its convergence with to its divergence from Denton Creek. As a result of the modifications, the base flood elevations (BFEs) along Denton Creek increased and decreased compared to the effective BFEs; the width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, decreased compared to the effective SFHA width; and the width of the regulatory floodway increased and decreased compared to the effective floodway width~ In addition, the BFEs along Old Denton Creek increased and decreased compared to the effective BFEs; and the SFHA width decreased compared to the effective SFHA width. All affected property owners were notified of the changes in BFE, SFHA width, and floodway width in a public notice published in the Citizen's Advocate on February 14 and February 21, 1997~ The modifications are shown on the enclosed annotated copy of FIRM Panel(s) 0010 E, Profile Panel(s) 0BP. 09P, and lIP, and affected portions of the Summary of Discharges Table and Floodway Data Table. This LOMR hereby revises the above-referenced panel(s) of the effective FIRM and the affected portions of the FIS report, both dated April 15, 1994. The modifications are effective as of the date shown above. The map panel(s) as listed above and as modified by this letter will be used for all flood insurance policies and renewals issued for your community. The changes in BFEs, when rounded to a whole foot, are equal to zero; therefore, we will not republish the BFEs. A review of the determination made by this LOMR and any requests to alter this determination should be made within 30 days. Any request to alter the determination must be based on scientific or technical data. Because this LOMR will not be printed and distributed to primary users, such as local insurance agents and mortgage lenders, your community will serve as a repository for these new data. We encourage you to disseminate the information reflected by this LOMR throughout the community, so that interested persons, such as property owners, local insurance agents, and mortgage lenders, may benefit from the information. We also encourage you to prepare a related article for publication in your community's local newspaper. This article should describe the assistance that officials of your community will give to interested persons by providing these data and interpreting the NFIP maps. We will not physically revise and republish the FIRM and FIS report for your community to reflect the modifications made by this LOMR at this time. When changes to the previously cited FIRM panel(s) and FIS report warrant physical revision and republication in the future, we will incorporate the modifications made by this LOMR at that time. The floodway is provided to youi' community as a tool to regulate floodplain development. Therefore, the floodway modifications described in this LOMR, while acceptable to FEMA, must also be acceptable to your community and adopted by appropriate community action, as specified in Paragraph 60.3(d) of the NFIP regulations. This LOMR is based on minimum floodplain management criteria established under the NFIP. Your community is responsible for approving all floodplain development, and for ensuring all necessary permits required by Federal or State law have been received. State, county, and community officials, based on knowledge of local conditions and in the interest of safety, may set higher standards for construction in the SFHA. If the State, county, or community has adopted more restrictive or comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP criteria. Pa~¢ 2 of 9 This determination has been made pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (Public Law 93-234) and is in accordance with the National Flood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. Pursuant to Section 1361 of the National Flood Insurance Act of 1968, as amended, communities participating in the NFIP are required to adopt and enforce floodplain management regulations that meet or exceed minimum NFIP criteria. These criteria are the minimum and do not supersede any State or local requirements of a more stringent nature. This includes adoption of the effective FIRM to which the regulations apply and the modifications described in this LOMR. Our records show that your community has met this requirement. A Consultation Coordination Officer (CCO) has been designated to assist your community. The CCO will be the primary Iiaison between your community and FEMA. For information regarding your CCO, please contact: Mr. James LeGrotte Director, Mitigation Division Federal Emergency Management Agency, Region VI Federal Regional Center, Room 206 800 North Loop 288 Denton, Texas 76201-3698 (817) 898-5127 If you have any questions regarding floodplain management regulations for your community or the NF1P in general, please contact the CCO for your community at the telephone number cited above. If you have any technical questions regarding this LOMR, please contact Mr. Alan Johnson of our staff in Washington, DC, either by telephone at (202) 646-3403 or by facsimile at (202) 646-4596. Sincerely, Mitigati>n Directorate Enclosure(s) CC; Mr. Kenneth M. Griffin, P.E. Director of Public Works City of Coppell Ms. Sabine Borgnet-Harris Halff Associates, Inc. X~ © TABLE 1 - SUMMARY OF DISCHARGES - continued FLOODING SOURCE AND LOCATION DRAINAGE AREA (sq. miles) DENTON CREEK At confluence with Elm Fork of Trinity River 24.23x 10,600 Below Cottonwood Branch 19.45x 13,300 Above Cottonwood Branch 12.52x 9,400 At State Route 121 10.30~ 10,000 PEAK DISCHARGES (cf~) 50-y~ ~0o-_ificX2~ .500-YEAR 15,500 17,800 36,200~ 18,900 21,300 36,200~ 13,200 14,900 36,200' 13,800 15,600 36,200~ OLD DENTON CREEK I At convergence withI Denton Creek COTTONWOOD BRANCH At confluence with Denton Creek At Sandy Lake Road At State Road At Bethel Road REVISED DATA 4,000 ~// * 6.93 4,500 6,400 7,300 9,400 5.69 4,200 5,900 6,700 8,600 4.69 3,600 5,100 5,700 7,300 3.64 3,600 5,000 5,600 7,100 *Data not available ~Drainage area below Grapevine Lake ~Discharge for Denton Creek below Grapevine Dam controlled outflows from Graoev%ne La~e The decrease in peak discharge with an increase in drainage area for some streams is due to watershed shape and/or overhank storage effects. 3.2 Hydraulic Analyses Analyses of the hydraulic characteristics of flooding from the sources studied were carried out to provide estimates of the elevations of floods of the selected recurrence interwals. Cross sections were obtained from Texas State Highway Department bridge plans, field surveys, and studies prepared by Albert H. Halff and Associates, Inc., URS Engineers, Nathan D. Meier and Associates, Inc., Freeze and Nichols, and Caffey and Morrlson, Inc. Locations of selected cross sections used in the hydraulic analyses are shown on the Flood Profiles (Exhibit 1). For st for which a floodway was computed (Section 4.2), sel. 9 s TO REFLECT LOMR DATED *~ Pa~e 6 of 9 CITY OF COPPELL, TX fOALLA$ ANO DENTON COS,) ~ I ............... 1 ........ -._:- ..... , :::': - -~ ..... ~ --:-- :.-' --- ' :::'"L:: ~l, ~ .... ,. .I ...... ~ ....... ~ ~ ~ '' -- ::: I::'.-'-': -' _:---, .... ~ .... ":~ = '- I:::. ":-:i ::::' .::,' -~::: ' : : :' '~ ..... -: .... ~DAL~S AND O,.TON COS.[ OLD DENTON CREEK / ,„„. ... (11/004khed:1_, IP mil" • .** .- --'......, ;;•-■,,..0• ___,-___. -:,-. 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AtialLitli 1.- ' / ... ,1 _60 E.-44 iiasii _weirammewmil,apr....:_„444 4, I . ' 'V• .._s' . ' . .. ' .4' I'' . ' "iti ' . .'I 4; ' : ! ;■4. ' .-.- -6-•`'..A....'"° *'-' .. ..".:....%-;----Mr it"--.-_-.7 7 r.,/,‘,17,,,,P,—,..,,END!Xi Jl ru iui cWJ L. LaLCJ- vv1JFJCn r fall. r tats VY .7I GUI LVVJ RS=25530 .055 O —.055 3 Legend 5 EGPF1 WS PF 1 Ground 460 Bank Sta g 450- m - w - w 440- - 0 2000 4000 6000 8000 Station(ft) St Andrews Estates- Coppell Plan: Plan 04 9/28/2003 RS=24700 .055 >1 0 0 0' Legend 3 5 3 5 5 5 EG PF 1 WS PF 1 1 —� Ground \Nvivipire ik 460- Ineff a Bank Sta ■N C ' O 4.50_ f6 _ W 440 - M 430 , 2000 4000 6000 8000 10000 Station(ft) 1 in Horiz.=1500 ft 1 in Vert.=10 ft APPENDIX E 1 ©r 4 St Andrews Estates-Coppell Plan: Plan 04 9/28/2003 RS=24400 .055 >16' . 055>3� .055 Legend 5 5 EG PF 1 WSPF1 Ground T heft • Bank Sta c O 450_ d - w 440- 430 , 0 2000 4000 6000 8000 Station(ft) St Andrews Estates- Coppell Plan: Plan 04 9/28/2003 RS=23800 .055 TI . ( .055— .035 .055) 3 Legend Bank Sta 5 EG PF • di/ WSPF1 Ground 460 Ineff 2 450 d w 440 • a 2000 4000 6000 8000 10000 Station(ft) 1 in Horiz.=1500 ft 1 in Vert.=10 ft "2_ a St Andrews Estates-Coppell Plan: Plan 04 9/28/2003 RS=23500 100 ft downstream of confluence with minor trib .055 >10 H.055--)<D35><•'°55 3 Legend 5 EG PF 1 WS PF 1 Ground 460 4 Ineff • Bank Sta 0 450 ■ 440 N 2000 4000 6000 8000 10000 Station(ft) St Andrews Estates- Coppell Plan: Plan 04 9/28/2003 RS=22370 !�• .06 . .055 O 3 5 Legend 5 EGPF1 WS PF 1 Crit PF1 —a-- 460 Ground Bank Sta 0 450 > w 440- 430 2000 4000 6000 8000 10000 Station(ft) 1 inHoriz.=1500ft 1 in Vert.=10ft 4 oG 4 2 : 6C1 'a = N S N N N 1 I co O O N O N O CO \0 /, EL N EC. '// T\, i = , L , o U o \ lam // m W N � r L C J -0 /< \ / -- VJ N 1--' / N r / `e. o� �r � � ,/ APPENDIX F / i APPENDIX G > Z APPENDIX H HEC-RAS Version 3.1.1 May 2003 U.S. Army Corp of Engineers Hydrologic Engineering Center 609 Second Street, Suite D Davis, California 95616-4687 (916) 756-1104 X X XXXXXX XXXX X X X X X X X X X XXXXXXX XXXX X X X X X X x x x x X X XXXXXX XXXX XXXX XX XXXX X X X X X X X X X x XXX XXXX XXXXXX XXXX X X x X x x x X x X X X X X XXXXX PROJECT DATA Project Title: St Andrews Estates - Coppell Project File : StA~drews.prj Run Date and Time: 9/28/2003 11:35:47 PM Project in English units Project Description: OLD DENTON CREEK - COPPELL SIDE - EXISTING FLOODWAY - 100 YR DISCHARGE PROFILE FIS (K-H Encroachment Model) DENTON CREEK, TEXAS PLAN DATA plan Title: Plan 04 Plan File : C:\PROJECT$\13004\stAndrews.p04 Geometry Title: Added section at minor trib - filled Geometry File : C:\PROJECTS\13004\StAndrews.g02 Flow Title : Imported Flow 01 Flow File : C:\PROJECTS\13004\StAndrews.f01 Plan Sunm~ry Information: Number of: Cross Sections = 8 Mulitple Openings = 0 Culverts 0 Inline Structures 0 Bridges 0 Lateral Structures = 0 Computational Information Water surface calculation tolerance = 0.01 critical depth calculaton tolerance = 0.01 Maxi~unnumber of interations 20 Maximu/n difference tolerance 0.3 Flow tolerance factor 0.001 Computation Options critical depth computed only where necessary Conveyance Calculation Method: At breaks in n values only Friction Slope Method: Average Conveyance Computational Flow Regime: Subcritical Flow Encroachment Data Equal Conveyance = True %eft Offset = 0 APPENDIX I Right Offset = 0 River = RIVER-1 Reach = Reach-I RS Profile Method Valuel Value2 22370 PF 2 1 5094 5460 23800 PF 2 1 6625 6720 24¢00 PF 2 1 6050 6165 24700 PF 2 1 4800 4900 25530 PF 2 1 2494 2743 River = Old Dention Cree Reach = From confluence RS Profile Method Valuel Value2 22370 PF 2 1 5094 5460 23800 PF 2 1 6625 6720 24400 PF 2 1 6050 6165 24700 PF 2 1 4800 4900 25530 PF 2 I 2494 2743 FLOW DATA Flow Title: Imported Flow 01 Flow File : C:\PROJECT$\13004\StAndrews.f01 Flow Data (¢fs) River Reach RS RIVER-1 Reach-1 25530 RIVER-1 Reach-1 24700 RIVER-1 Reach-1 22370 Old Dention CreeFromconfluence 25530 Old Dention CreeFrom confluence 24700 Old Dention CreeFrom confluence 22370 Old Denton CreekReach 1 25530 Old Denton CreekReach 1 24700 Old Denton CreekReach 1 22370 PF 1 20600 4000 20600 20600 4000 20600 20600 4000 20600 PF 2 20600 4000 20600 20600 4000 20600 20600 4000 20600 Boundary Conditions River Reach Profile Downstream Old Denton CreekReach 1 PF 1 = 452.58 Old Denton CreekReach I PF 2 = 453.52 Upstream ~nown WS El~own WS GEOMETRY DATA Geometry Title: Added section at minor trib - filled Geometry File : C:\PROJECTS\13004\StAndrews.g02 CROSS SECTION RIVER: Old Denton Creek REACH: Reach 1 INPUT Desqription: RS: 25530 Station Elevation Data num= 45 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev -500 469.5 600 460.5 700 455.6 800 452.9 900 450.4 1000 449.9 1100 451.1 1200 450.6 1300 451.3 1400 450.8 1500 451 1600 451.4 1700 451.6 1800 451.5 1900 452.7 2000 453.1 2100 453.4 2200 454.2 2300 454.3 2400 455 Z495.2 455.33 2570 436.63 2627.2 436.63 2630 434.5 2670 434.4 2742.67 454.8 2780 453.5 2800 455 3020 456.5 3100 456.8 3240 457.8 3315 457.8 3395 457.8 3540 457.2 3620 455.9 3680 456.9 3825 458 3905 458.4 4000 458.7 4100 457.7 4200 457 4300 456.5 4400 455.1 4500 454.9 4600 453.8 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val -500 .055 2495.2 .035 2742.67 .055 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2495.2 2742.67 800 360 350 .1 .3 CROSS SECTION OUTPUT Profile #PF 1 E.G. Elev (ft) 453.78 Element Left OB Channel Right OB Vel Head (ft) 0.50 Wt. n-Val. 0.055 0.035 W.S. Elev (ft) 453.27 Reach Len. (ft) 800.00 360.00 350.00 Crit W.S. (ft) Flow Area (sq ft) 2406.38 2943.11 E.G. Slope (ft/ft) 0.000724 A~ea (sq ft) 2406.38 2943.11 Q Total (cfs) 20600.00 Flow (cfs) 2676.52 17923.48 Top Width (ft) 1505.65 Top Width (ft) 1271.84 233.81 Vel Total (ft/s) 3.85 Avg. Vel. (ft/s) 1.11 6.09 Max Chl Dpth (ft) 18.87 Hydr. Depth (ft) 1.89 12.59 Conv. Total (cfs) 765425.9 Conv. (cfs) 99450.2 665975.7 Length Wtd. (ft) 413.58 Wetted Per. (ft) 1271.90 239.18 Min Ch E1 (ft) 434.40 Shear (lb/sq ft) 0.09 0.56 Alpha 2.19 Stream Power (lb/ft s) 0.10 3.39 Frctn Loss (ft) 0.22 Cum Volume (acre-ft) 397.76 73.93 7.01 C & E Loss (ft) 0.10 Cua~ SA (acres) 146.41 5.39 2.70 Warning: Divided flow computed for this cross-section, War~ing: The conveyance ratio (upstrea~ conveyance divided by downstream conveyance) is less than 0.7 or greater than 1,4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: Old Denton Creek REACH: Reach 1 RS: 24700 INPUT Description: Station Elevation Data hUm= 53 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1000 465 1120 462 1140 462 1230 460 1300 460 1410 457 1550 455 1650 454 1870 453 2080 452 2180 451 2260 450 2630 451 2910 451 2980 451 3180 452 3340 452 3530 452 3800 453 4000 453 4110 453 4188.16 453 4260 435.04 4350 435.04 4424.38 453.63 4450 454 4480 455 4510 455 4780 454 4800 451 4810 451 4830 440 4850 433.9 4880 440 4950 456 5170 456 5200 456 5260 456.3 5300 456.6 5400 456.9 5550 457 5800 458.4 5900 459 5970 459.4 6050 459.7 6140 459.9 6360 459 6410 458.5 6480 458.3 6500 458.7 6580 459.2 6670 460 6690 462 Mann. ing's n Values nun~ 5 Sta n Val sta n Val Sta n Val 1000 .055 4188.16 .035 4424.38 .055 Bank Sta: Left Right Lengths: Left Channel 4830 4880 210 350 Ineffective Flow hum= 1 ~Sta L Sta R Elev Permanent 1000 4480 455 T Sta n Val Sta n Val 4810 .035 4950 .055 CROSS SECTION OUTPUT Profile #PF 1 Right Coeff Contr. Expan. 80 .1 .3 E.G. Elev (ft) 453.45 Element Left OB Channel Right OB Vel Head (ft) 0.16 Wt. n-Val. 0.036 0.035 0.035 W.S. Elev (ft) 453.30 Reach Len. (ft) 210.00 350.00 80.00 Crit W.S. (ft) Flow Area (sq ft) 196.45 817.30 386.72 E.G. Slope (ft/ft) 0.000176 Area (sq ft) 6733.57 817.30 386.72 Q Total (cfs) 4000.00 Flow (cfs) 336.03 2906.71 757.27 Top Width (ft) 2771.65 Top Width (ft) 2663.48 50.00 58.17 Vel Total (ft/s) 2.86 Avg. Vel. (ft/s) 1.71 3.56 1.96 Max Chl Dpth (ft) 19.40 Hydr. Depth (ft) 4.34 16.35 6.65 Conv. Total (cfs) 301453.8 Conv. (cfs) 25324.1 219059.5 57070.3 Length Wtd. (ft) 311.38 Wetted Per. (ft) 48.30 51.52 59.67 Min Ch E1 (ft) 433.90 Shear (lb/sq ft) 0.04 0.17 0.07 Alpha 1.25 Stream Power (lb/ft s) 0.08 0.62 0.14 Frctn Loss (ft) 0.09 Cum Volume (acre-ft) 313.83 58.39 5.46 C & E Loss (ft) 0.02 Cum SA (acres) 110.28 4.22 2.47 Warning: Divided flow com~uted for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: Old Denton Creek REACH: Reach 1 RS: 24400 INPUT Description: Station Elevation Data num= 40 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1000 465 1040 460 1090 457.5 1140 459.5 1200 452 1240 452 1270 457 1340 452 1540 450.5 1700 450 1940 450 2200 449 2790 450 3250 450 3340 451 3870 452 4090 451 5000 451 5220 452 5240 459.5 5260 459.2 5280 452.3 5310 452 5365 433.5 5445 433.5 5510 451.5 5600 453 5950 456.5 6050 453 6100 446 6120 431.5 6160 452 6180 456 7120 457.8 7430 459 7670 459.9 9020 458 9240 457.5 9440 458 9940 458.5 Manning's n Values hum= 5 Sta n Val Sta n Val Sta n Val Sta n Val Sta n Val 1000 .055 5260 .035 5510 .055 6050 .035 6180 .055 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 6100 6160 500 900 200 .1 .3 Ineffective Flow num~ 1 Sta L Sta R Elev Permanent 1000 5950 456.5 T CROSS SECTION OUTPUT Profile #PF 1 E.G. Elev (ft) 453.34 Element Left OB Channel Vel Head (ft) 0.34 Wt. n-Val. 0.035 0.035 Right OB 0.035 W.S. Elev (ft) 453.00 Reach Len. (ft) 500.00 900.00 Crit W.5. (ft) Flow Area (sq ft) 175.19 735.23 E.G. Slope (ft/ft) 0.000572 Area (sq ft) 12511.92 735.23 Q Total (els) 4000.00 Flow (cfs) 407.55 3590.86 Top Width (ft) 4388.34 Top Width (ft) 4323.32 60.00 Vel Total (ft/s) 4.38 Avg. Vel. (ft/s) 2.33 4.88 Hax Chl Dpth (ft) 21.50 Hydr. Depth (ft) 3.50 12.25 Conv. Total (cfs) 167319.1 Cony. (cfs) 17047.6 150204.9 Length Wtd. (ft) 854.27 Wetted Per. (ft) 50.60 69.65 Min Ch E1 (ft) 431.50 Shear (lb/sq ft) 0.12 0.38 ~tlpha 1.14 Stream Power (lb/ft s) 0.29 1.84 Frctn Loss (ft) 0.40 Cum Volume (acre-ft) 267.44 52.16 C & E Loss (ft) 0.02 Cum SA (acres) 93.44 3.78 200.00 2.52 2.52 1.59 5.02 0.63 0.50 66.7 5.12 0.02 0.01 5.10 2.41 Warning: Divided flow computed for this cross-section. CROSS SECTION RIVER: Old Denton Creek REACH: Reach 1 RS: 23800 INPUT Description: station Elevation Data nu~= 52 Eta Elev Eta Elev Eta Elev Eta Elsv Eta Elev 1000 465 1110 460 1190 457 1280 456 1340 455 1480 455 1590 454 1740 453 1860 452 1950 451 2110 450 2820 449 2850 449 3280 450 3300 450 3350 450 3410 450 3440 451 3540 451 3630 451 4140 451 4190 450.4 4240 451 4380 451 4900 450.6 5280 451 5380 451 5468.04 451.42 5535 434.68 5625 434.68 5694.28 452 5820 454 5940 454 5970 455 6310 455 6390 454 6410 455 6510 455 6610 452 6620 450 6640 440 6660 433.3 6680 440 6700 450 6750 454 7070 454 7239 454 7240 454 7280 454 7350 455 7470 460 7550 470 Manning's n Values num= 5 Sta n Val Sta n Val Eta n Val Eta n Val Sta n Val 1000 .055 5468.04 .035 5694.28 .055 6610 .035 7070 .055 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 6640 6700 100 100 100 .1 .3 Ineffective Flow num= 1 Eta L Eta R Elev Permanent 1000 6310 455 T CROSS SECTION OUTPUT Profile #PF 1 E.G. Elev (ft) 452.93 Element Left OB Channel Right OB Vel Head (ft) 0.28 Wt. n-Val. 0.035 0.035 0.035 W.S. Etev (ft) 452.65 Reach Len. (ft) 100.00 100.00 100.00 Crit W.S. (ft) Flow Area (sq ft) 176.40 792.84 43.80 E.G. Slope (ft/ft) 0.000388 Area (sq ft) 11204.03 792.84 43.80 Q Total (cfs) 4000.00 Flow (cfs) 427.08 3528.87 44.05 Top Width (ft) 4097.30 Top Width (ft) 4004.21 60.00 33.09 Vel Total (ft/s) 3.95 Avg. Vel. (ft/s) 2.42 4.45 1.01 Max Chl Dpth (ft) 19.35 Hydr. Depth (ft) 3.42 13.21 1.32 Conv. Total (cfs) 203116.8 Conv. (cfs) 21686.8 179193.0 2236.9 Length Wtd. {ft) 100.00 Wetted Per. (ft) 54.14 64.55 33.20 Min Ch E1 (ft) 433.30 Shear (lb/sq ft) 0.08 0.30 0.03 Alpha 1.16 Stream Power (lb/ft s) 0.19 1.32 0.03 Frctn Loss (ft) 0.04 Cum Volume (acre-ft) 131.33 36.37 5.00 C & E Loss (ft) 0.01 Cum SA (acres) 45.64 2.54 2.32 ~5 o~ ~0 Warning: Divided flow computed for this cross-section. CROSS SECTION RIVER: Old Denton Creek REACH: Reach 1 RS: 23700 INPUT Description: 100 ft upstream of confluence with minor trib Station Elevation Data nu~ 52 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1000 465 1110 460 1190 457 1280 456 1340 455 1480 455 1590 454 1740 453 1860 452 1950 451 2110 450 2820 449 2850 449 3280 450 3300 450 3350 450 3410 450 3440 451 3540 451 3630 451 4140 451 4190 450.4 4240 451 4380 451 4900 450.6 5280 451 5380 451 5468.04 451.42 5535 434.68 5625 434.68 5694.28 452 5820 454 5940 454 5970 455 6310 455 6390 454 6410 455 6510 455 6610 452 6620 450 6640 440 6660 433.2 6680 440 6700 450 6900 454 7070 454 7239 454 7240 454 7280 454 7350 455 7470 460 7550 470 Manning's n Values num= 5 Sta n Val Sta n Val Sta n Val Sta n Val Sta n Val 1000 .055 5468.04 .035 5694.28 .055 6610 .035 7070 .055 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 6640 6700 100 100 100 .1 .3 Ineffective Flow num= 1 Sta L Sta R Elev penmanent 1000 6310 455 T CROSS SECTION OUTPUT Profile %PF 1 E.G. Elev (ft) 452.88 Element Left OB Channel Right OB Vel Head (ft) 0.26 Wt. n-Val. 0.035 0.035 0.035 W.S. Elev (ft) 452.63 Reach Len. (ft) 100.00 100.00 100.00 Crit W.S. (ft) Flow ;trea (sq ft) 175.38 793.64 172.56 E.G. Slope (ft/ft) 0.000364 ~ea (sq ft) 11124.04 793.64 172.56 Q Total (cfs) 4000.00 Flow (cfs) 411.08 3421.34 167.58 Top Width (ft) 4191.25 Top Width (ft) 3999.89 60.00 131.36 vel Total (ft/s) 3.50 Avg. Vel. (ft/s) 2.34 4.31 0.97 Max Chl Dpth (ft) 19.43 Hydr. Depth (ft) 3.44 13.23 1.31 Cony. Total (cfs) 209714.7 Cony. (cfs) 21552.4 179376.1 8786.1 Length W~d. (ft) 100.00 Wetted Per. (ft) 53.48 64.61 131.39 Min Ch E1 (ft) 433.20 Shear (lb/sq ft) 0.07 0.28 0.03 Alpha 1.34 Stream Power (lb/ft s) 0.17 1.20 0.03 Frctn Loss (ft) 0.02 Cum Volume (acre-ft) 105.70 34.55 4.75 C & E Loss (ft) 0.06 Cum SA (acres) 36.45 2.40 2.13 Waming: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: Old Denton Creek REACH: Reach 1 RS: 23600 INPUT Description: At confluence with minor trib Station Elevation Data num= 52 Sta Elev Sta Elev Sta Elev 1000 465 1110 460 1190 457 1480 455 1590 454 1740 453 r 2110 450 2820 449 2850 449 3350 450 3410 450 3440 451 4140 451 4190 450.4 4240 451 5280 451 5380 451 5468.04 451.42 5694.28 452 5820 454 5940 454 6390 454 6410 455 6510 455 6640 440 6660 433.1 6680 440 7070 452 7239 453.5 7240 454 7470 460 7550 470 Sta Elev Sta Elev 1280 456 1340 455 1860 452 1950 451 3280 450 3300 450 3540 451 3630 451 4380 451 4900 450.6 5535 434.68 5625 434.68 5970 455 6310 455 6610 452 6620 450 6700 442 6900 450 7280 454 7350 455 Manning's n Values num= 5 sta n Val Sta n Val sta n Val 1000 .055 5468.04 .035 5694.28 .055 Bank Sta: Left Right Lengths: Left Channel 6640 6700 100 100 Ineffective Flow num= 1 Sta L Sta R Elev Peri, anent 1000 6310 455 T Sta n Val Sta n Val 6610 .035 7070 .055 CROSS SECTION OUTPUT Profile #PF 1 Right Coeff Contr. Expan. 100 .1 .3 E.G. Elev (ft) 452.81 Element Left OB Channel Right OB Vel Head {ft) 0.05 Wt. n-Val. 0.035 0.035 0.035 W.S. Elev (ft) 452.76 Reach Len. (ft) 100.00 100.00 100.00 Crit W.S. (ft) Flow Area {sq ft) 182.20 883.35 1681.85 E.G. Slope (ft/ft) 0.000086 Area (sq ft) 11640.21 883.35 1681.85 Q Total (cfs) 4000.00 Flow (cfs) 207.69 2031.87 1760.45 Top Width (ft) 4542.85 Top Width (ft) 4027.69 60.00 455.16 Vel Total {ft/s) 1.46 Avg. Vel. (ft/s) 1.14 2.30 1.05 Max Chl Dpth (ft) 19.66 Hydr. Depth (ft) 3.30 14.72 3.70 Cony. Total (cfs) 431979.1 Cony. (cfs) 22429.1 219431.0 190118.9 Length Wtd. (ft) 100.00 Wetted Per. (ft) 57.77 62.41 455.34 Min Ch E1 (ft) 433.10 Shear (lb/sq ft) 0.02 0.08 0.02 Alpha 1.53 Stream Power (lb/ft s) 0.02 0.17 0.02 Frctn Loss (ft) 0.02 cu~ Volume (acre-ft) 79.57 32.62 2.62 C & E Loss (ft) 0.02 cum SA (acres) 27.24 2.26 1.46 Warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1,4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: Old Denton Creek REACH: Reach 1 RS: 23500 INPUT Description: 100 ft downstream of confluence with minor trib Station Elevation Data num- 52 Sta Elev Sta Elev Sta Elev 1000 465 1110 460 1190 457 1480 455 1590 454 1740 453 2110 450 2820 449 2850 449 3350 450 3410 450 3440 451 4140 451 4190 450.4 4240 451 5280 451 5380 451 5468.04 451.42 Sta Elev Sta Elev 1280 456 1340 4S5 1860 452 1950 451 3280 450 3300 450 3540 451 3630 451 4380 451 4900 450.6 5535 434.68 5625 434,68 5694.28 452 5820 454 5940 454 5970 455 6310 455 6390 454 6410 455 6510 455 6610 452 6620 450 6640 440 6660 433 6680 440 6700 450 6900 454 7070 454 7239 454 7240 454 7280 454 7350 455 7470 460 7550 470 Mar~ning's n Values nun~ 5 Sta n Val Sta n Val Sta n Val Sta n Val Sta n Val 1000 .055 5468.04 .035 5694.28 .055 6610 .035 7070 .055 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 6640 6700 200 500 200 .1 .3 Ineffective Flow hum= 1 Sta L Sta R Elev Permanent 1000 6310 455 T CROSS SECTION OUTPUT Profile #PF 1 E.G. Elev (ft) 452.77 Element Left OB Channel Right OB Vel Head (ft) 0.26 Wt. n-Val. 0.035 0.035 0.035 W.S. Elev (ft) 452.50 Reach Len. (ft) 200.00 500.00 200.00 Crit W.S. (ft) Flow A~ea (sq ft) 169.40 790.30 156.87 E.G. Slope (ft/ft) 0.000376 Area (sq ft) 10636.41 790.30 156.87 Q Total (cfs) 4000.00 Flow (cfs) 402.10 3447.93 149.97 Top Width (ft) 4158.69 Top Width (ft) 3973.45 60.00 125.25 Vel Total (ft/s) 3.58 Avg. Vel. (ft/s) 2.37 4.36 0.96 Max Chl Dpth (ft) 19.50 Hydr. Depth (ft) 3.62 13.17 1.25 Cony. Total (cfs) 206362.4 Conv. (cfs) 20744.4 177880.9 7737.2 Length Wtd. (ft) 396.87 Wetted Per. (ft) 49.40 64.74 125.27 Min Ch E1 (ft) 433.00 Shear (lb/sq ft) 0.08 0.29 0.03 Alpha 1.33 Stream Power (lb/ft s) 0.19 1.25 0.03 Frctn Loss (ft) 0.06 Cum Volume (acre-ft) 54.00 30.70 0.51 C & E Loss (ft) 0.06 Cum SA (acres) 18.06 2.13 0.79 Warning: Divided flow cor%Duted for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: Old Denton Creek REACH: Reach 1 RS: 22370 INPUT Description: Station Elevation Data nu/~= 28 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1000 460 1300 449 1750 449 1950 448 2550 448 2950 450 3670 450 4010 449 4070 448 4370 449.5 4970 450.5 5094 450.5 5160 434.04 5220 434.04 5280 434.04 5320 432.5 5345 435 5360 445 5380 446 5405 452.7 5460 454.5 5870 454 6310 452.5 6480 452 6550 453.5 6610 457 6630 459.5 6780 466 Manning's n Values num= 5 Sta n Val Sta n Val Sta n Val Sta n Val Sta n Val 1000 .05 1300 .06 5094 .035 5460 .055 6610 .05 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 5094 5460 800 800 400 .1 .3 CROSS SECTION OUTPUT Profile 9PF 1 E.G. Elev (ft) 452.66 Vel Head (ft) 0.08 W.$. Elev (ft) 452.58 Crit W.S. (ft) 440.90 E.G. Slope (ft/ft) 0.000123 Q Total (cfs) 20600.00 ~op Width (ft) 4422.72 Vel Total (ft/s) 1.18 Max Chl Dpth (ft) 20.08 Cony. Total (cfs) 1858985.0 Length Wtd. (ft) M/n Ch E1 (ft) 432.50 Alpha 3.56 Frctn Loss (ft) C & E Loss (ft) Element Left OB Channel Right OB Wt. n-Val. 0.060 0.035 0.055 Reach Len. (ft) Flow Area (sq ft) 12886.24 4559.48 64.89 Area (sq ft) 12886.24 4559.48 64.89 Flow (cfs) 7895.60 12695.81 8.59 Top Width (ft) 3891.64 310.55 220.53 Avg. Vel. (ft/s) 0.61 2.78 0.13 Hydr. Depth (ft) 3.31 14.68 0.29 Conv. (cfs) 712514.7 1145695.0 775.4 Wetted Per. (ft) 3891.72 316.65 220.54 Shear (lb/sq ft) 0.03 0.11 0.00 stream Power (lb/ft s) 0.02 0.31 0.00 Cum Volume (acre-ft) Cum SA (acres) Warning: Divided flow computed for this cross-section. SUMMARY OF MANNING'S N VALUES River:Old Denton Creek Reach River Sra. nl n2 n3 n4 n5 Reach 1 25530 .055 .035 .055 Reach 1 24700 .055 .035 .055 .035 .055 Reach 1 24400 ,055 .035 .055 .035 .055 Reach 1 23800 .055 .035 .055 .035 .055 Reach 1 23700 .055 .035 .055 .035 .055 Reach 1 23600 .055 .035 .055 .035 .055 Reach 1 23500 .055 .035 .055 .035 .055 Reach 1 22370 .05 .06 .035 .055 .05 5U~gt~RY OF REACH LENGTHS River: Old Denton Creek Reach River Sra. Left Reach 1 25530 800 Reach 1 24700 210 Reach 1 24400 500 Reach 1 23800 100 Reach I 23700 100 Reach 1 23600 100 Reach 1 23500 200 Reach 1 22370 800 Channel 360 350 900 100 100 100 5OO 800 Right 350 80 200 100 100 100 200 4OO SLg~4ARY OF CONTRACTION AND EXPANSION COEFFICIENTS River: Old Denton Creek Reach River Sta. Contr. Expan. Reach 1 Reach 1 Reach 1 25530 .1 .3 24700 .1 .3 24400 .1 .3 Reach 1 23800 .1 .3 Reach 1 23700 .1 .3 Reach 1 23600 .1 .3 Reach 1 23500 .1 .3 Reach 1 22370 .1 .3 ERRORS WARNINGS AND NOTES Errors Warnings and Notes for Plan : Plan 04 River: Old Denton Creek Reach: Reach 1 Warning:Divided flow computed for this Warning:The conveyance ratio (upstream less than 0.7 or greater than 1.4. This may indicate the need for River: Old Denton Creek Reach: Reach 1 Warning:Divided flow computed for this Warning:The conveyance ratio (upstream less than 0.7 or greater than 1.4. This ~ay indicate the need for River: Old Denton Creek Reach: Reach 1 Warning:Divided flow computed for this River: Old Denton Creek Reach: Reach 1 Warning:Divided flow computed for this River: Old Denton Creek Reach: Reach 1 W~rning:Divided flow computed for this Warning:The conveyance ratio (upstream less than 0.7 or greater than 1.4. This may indicate the need for River: Old Denton Creek Reach: Reach 1 Warning:Divided flow computed for this Warning:The conveyance ratio (upstream less than 0.7 or greater than 1.4. This may indicate the need for River: Old Denton Creek Reach: Reach 1 Warning:Divided flow computed for this Warning:The conveyance ratio (upstream less than 0.7 Or greater than 1.4. This may indicate the need for River: Old Denton Creek Reach: Reach 1 Warning:Divided flow computed for this RS: 25530 Profile: PF 1 cross-section. conveyance divided by downstream conveyance) is additional cross sections. RS: 24700 Profile: PF 1 cross-section. conveyance divided by downstream conveyance) is additional cross sections. RS: 24400 Profile: PF 1 cross-section. RS: 23800 Profile: PF 1 cross-section. RS: 23700 Profile: PF 1 cross-section. conveyance divided by downstream conveyance) is additional cross sections. RS: 23600 Profile: PF 1 cross-section. conveyance divided by downstream conveyance) is additional cross sections. RS: 23500 Profile: PF 1 cross-section. conveyance divided by downstream conveyance) is additional cross sections. RS: 22370 Profile: PF 1 cross-section.