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Letter of Map Revision Request for River Oaks Assisted Living and Memory Care on Elm Fork of the Trinity River Coppell, Texas IMPORTANT INFORMATION This report is not valid until the project grading is complete and as-built plans provided that match this report. ( Morrison Hydrology LLC Texas Registered Engineering Firm F-12696 A kill .' ' ISUN 1600 Lake Air Drive IS j Waco, Texas 76710 OROLOGY Office (254) 741-0101 4 ....,T',�r�� : (254) 580-9636 Pt Alt's.,...�. ... �► Vi- Personal A rorrison@mhydrology.com a�p. W f/O RISO Date: 5/7/2012 36651 4 i , Table of Contents Introduction Hydrologic Information Hydraulic Information FEMA Effective Hydraulic Information Pre-Existing Condition Hydraulic Information Modified Condition Hydraulic Information Summary APPENDICES Appendix 1 Approved CLOMR CLOMR FEMA approval letter CLOMR Report(on attached disk) Appendix 2 FEMA Effective Information Case No. 10-06-3039P LOMR Case 10-06-3039P-480195 D48113C_0030 FEMA 500year HECRAS model Output(on attached disk) FEMA floodway HECRAS model Output (on attached disk) FEMA Multiple Profile HECRAS model Output(on attached disk) LOMR Case 10-06-3039P-480195 (on attached disk) Appendix 3 Modified Condition Hydraulic Information FEMAMOD.pdf As-Built Floodway HECRAS model Output(on attached disk) Preliminary Grading Plan Appendix 4 FEMA Forms River Oaks Assisted Living LOMR Coppell, Texas Page -3 Introduction The purpose of this report is to provide sufficient information in support of a Letter of Map Revision for the River Oaks Assisted Living and Memory Care Facility at Lot 1, Block A, Signature Living at the Denton Creek Addition, City of Coppell, Dallas County, Texas. The site is located as shown below: O \ K NOT TO SCALE % i ' 7/) ----\ 111 1 Project Site .: 1 if 1 SANDY LAM a 4yt -. .- 1,- 11 ROAD 1M1At ! � - CARROLLTON•'`�~ 3 Pop 82.169 R � b Pork ARD n I . The site is in the floodplain and floodway of the Elm Fork Trinity River in the City of Coppell, Texas. The floodplain and floodway for this area is in the process of being modified as part of the FEMA map modernization process. The current FEMA Map is dated August 23, 2001 (48113CO155 J). In June 22, 2007 a new Preliminary map (48113C0030 L)was presented by FEMA. During the past five years this map has seen many delays during the appeals process. We were not sure what map to use for this LOMR so we contacted Mr. Ronald C. Wanhanen, PE Engineer, FEMA Region 6. Mr. Wanhanen contacted Mr. Benjamin Kaiser RAMPP Team Leader Germantown Md. and both confirmed that the current FEMA map must be used for this LOMR. The maps shown on the following page are a portion of the two maps discussed. River Oaks Assisted Living LOMR Coppell, Texas Page -4 M :k RM604 ZONE X 4- :s„ \ t ZONE X �° ; __mot tI 5..i z^ r a r c..,,m -, it ZONE 1 X F'44s F ZONE X 4 Vnue A Current FEMA Map 48113C0155 J dated August 23, 2001 i Pig; el,' 44,7 41 ,..... ip(al....9.1finwAimpti.4011.--:Kw'7 ;.. -- v A" !WIIIMIIMF W.40; Oa. ,,. -F , owvE \Willi ZONE lop X' � i �il���,�� .lid 40 �, F ZONE X ix, i ZONE X � 1' ( titrai- -.1 '`f$ ,4.:i .. . .A.`4' 4V101114 \ 11 vis alti :A. :‘A: . Al mow,,.. -741NW r-- '9.' ,r 1/4/ Preliminary FEMA Map 48113C0030 L dated June 22, 2007 River Oaks Assisted Living LOMR Coppell, Texas Page-5 There are significant differences in these two maps, and even more differences in the models that support these two maps. Previous CLOMR A Conditional Letter of Map Revision was submitted to the City of Coppell and FEMA on July 30, 1996. The CLOMR was approved by FEMA on March 5, 1997. A portion of the CLOMR and FEMA Approval is contained in Appendix 1 and on the attached disc. The Effective Model used in this CLOMR has since been replaced with a more current Effective model, so the CLOMR presented in Appendix 1 is no longer valid. Hydrologic Information The flow used in the 1997 approved CLOMR was as follows: Frequency Discharge, CFS 10 year 24300 50 year 37100 100 year 44350 500 year 60400 The flow in the current Effective model is as follows: Frequency Discharge, CFS 10 year 17900 50 year 33200 100 year 43500 500 year 70700 This project uses the current FEMA Effective Model peak discharges as shown above without alteration. Hydraulic Information This study was completed using the U.S Army Corps of Engineers, River Analysis System(HEC-RAS). This software allows you to perform one-dimensional steady and unsteady flow river hydraulics calculations. The HEC-RAS software supersedes the HEC-2 river hydraulics package, which was a one-dimensional, steady flow water surface profiles program. The HEC-RAS software is a significant advancement over HEC-2 in terms of both hydraulic engineering and computer science. This product was developed by the Corps's Civil Works Hydrologic Engineering Research and Development Program. River Oaks Assisted Living LOMR Coppell, Texas Page -6 FEMA Effective Hydraulic Information The FEMA Effective model was obtained from a LOMR(10-06-3039P-480195)effective date June 20, 2011 (on attached disc). Pre-Existing Condition Hydraulic Information The Pre-Existing Condition Model used the FEMA effective model without alteration. LJ II IC AQ o _ ' rek IOW p Frier rat 0 O�P Lt __ r i 481 1"10 / • di * •N A/ 'O NP* ZONE/AE . A; ►, , hair/I 4 op, r LON ZONE X ' �� � �=�A w _ Ile REET h , , and -)∎ ( m ''' 1 / eJFF(INLPIA o i p' rr �" `I\, f F � 40 {FO RD ZONE X • PE SI E CREEK ORILT i ,te\°'II P9 ,;ifi''N A / ii iJ 1 Ii MAP SCALE 1"=1000' 500 0 1000 20%ET The above drawing shows that the project is outside the effective flow area and thus does not affect the 100 year floodplain. The effective flow was taken from the FEMA Effective model without alteration. The Effective model and the Modification Model are contained on the attached disc. A comparison between the 100 year flood elevations for the FEMA Effective model and the Modified Condition model are shown on the following page. This table confirms that the Modified Condition results in no change in the 100 year flood elevations. River Oaks Assisted Living LOMR Coppell, Texas Page -7 Table 1 Comparison between Effective and Modified 100 year River Q W.S. Reach Sta Plan Total Elev (cfs) (ft) ef3 97919 MOD 42900 447.44 ef3 97919 As Built FW 42900 447.44 ef3 97178 MOD 42900 447.07 ef3 97178 As Built FW 42900 447.07 ef3 93940 MOD 43500 444.66 ef3 93940 As Built FW 43500 444.66 ef3 93359 MOD 43500 443.66 ef3 93359 As Built FW 43500 443.66 ef3 93297 MOD 43500 443.47 ef3 93297 As Built FW 43500 443.47 ef3 93254.5 Bridge ef3 93212 MOD 43500 443.46 ef3 93212 As Built FW 43500 443.46 ef3 93197 MOD 43500 443.49 ef3 93197 As Built FW 43500 443.49 ef3 93196 MOD 43500 442.28 ef3 93196 As Built FW 43500 442.28 Summary The analysis contained within this report shows the FEMA Effective Condition and a Modified Condition. The Modified conditions shown in this report has shown no increase in 100 year flood elevations. The report summarizes modeling results showing a proposed modification to the Elm Fork of the Trinity River floodplain and floodway. This modification was based on 100- River Oaks Assisted Living LOMR Coppell, Texas Page-8 year existing conditions. A greater frequency storm was not considered and is not included in this report. Therefore, this study cannot predict the impact of a greater storm. This study assumes that all structural elements addressed remain intact and functional according to their original purpose. We recommend that this report be submitted to the City of Coppell and the Federal Emergency Management Agency in support of a Letter of Map Revision as soon as the grading is complete and verified with as-built plans. ``7."' ' ' Federal Emergency Management A enc. _. Washington, D.C. 20472 MAR 0 51997 1 C 1991 CERTIFIED MAIL IN REPLY REFER TOE RETURN RECEIPT REQUESTED Case No.: 97-06-239R.. The Honorable Tom Morton Community: City of Coppell, Texas Mayor, City of Coppell Community No.: 480170 255 Parkway Boulevard Coppell, Texas 75019 104 Dear Mayor Morton: ► This responds to a request that the Federal Emergency Management Agency (FEMA)comment on the effects that a proposed project would have on the effective Flood Insurance Rate Map(FIRM)for your community, in accordance with Part 65 of the National Flood Insurance Program(NFIP) regulations. In a letter dated February 7, 1997, Mr. Kenneth Griffin, P.E., Director of Engineering and Public Works, City of Coppell, requested that FEMA evaluate the effects that proposed excavation and fill in the floodway fringe along the western overbank of Elm Fork of Trinity River just upstream of Sandy Lake Road would have on the effective FIRM. The proposed project is also along the southern overbank of Denton Creek, which is under the influence of the backwater effects from Elm Fork of Trinity River through the project area. In addition, this request included a more detailed hydraulic analysis that incorporated more detailed topographic information to reflect existing watershed conditions. The City of Carrollton, Texas is also affected by this conditional revision request. All data required to complete our review of this request for a Conditional Letter of Map Revision(CLOMR) were submitted with Mr. Griffin's letter. We have completed our review of the submitted data and the flood data used to prepare the effective FIRM for your community. The submitted corrected effective conditions HEC-2 hydraulic computer model, dated July 22, 1996, based on updated topographic information, was used as the base conditions model in our review of the proposed conditions model for this CLOMR request. We believe that, if the proposed project is constructed as shown on the submitted map, entitled "Grading Plan, 18.9 AC. Sandy Lake Road Property, City of Coppell, Texas," dated January 30, 1997, prepared by Nathan D. Maier Consulting Engineers, Inc., and as described in the report, entitled "Floodplain Hydraulics Study, Elm Fork Trinity River," dated July 30, 1996, also prepared by Nathan D. Maier Consulting Engineers, Inc., a revision to the FIRM would be warranted. The submitted corrected effective analysis incorporated more detailed topographic information to reflect existing watershed conditions. The elevations of the flood having a 1-percent chance of being equaled or exceeded in any given year(base flood) increased by a maximum of 0.02 foot and decreased by a maximum of 0.01 foot, compared to the effective base flood elevations(BFEs). The submitted proposed conditions analysis incorporated the effects of the proposed project. The BFEs will increase by a maximum of 0.02 foot and decrease by a maximum of 0.05 foot, compared to the BFEs computed in the corrected effective analysis. The increase in BFE is because of fill in the floodway fringe. • 2 As a result of the proposed conditions analysis, the BFEs will increase and decrease compared to the effective BFEs. The maximum increase in BFE, 0.01 foot, will occur just upstream of Sandy Lake Road. The maximum decrease in BFE, 0.03 foot, will occur approximately 3,800 feet upstream of Sandy Lake Road. The width of the Special Flood Hazard Area(SFHA), the area that would be inundated by the base flood, will decrease compared to the effective SFHA width by a maximum of approximately 1,000 feet, approximately 400 feet upstream of Sandy Lake Road. Upon completion of the project, your community may submit the data listed below and request that we make a final determination on revising the effective FIRM. • Effective October 1, 1996, FEMA revised the fee schedule for reviewing and processing requests for modifications to published flood information and maps. Under this schedule,' FEMA established flat review and processing fees for most types of requests. All requests dated October 1, 1996,or later will be processed under this new schedule. The fee for your map revision request will be $2,300 and must be received before we can begin processing your request. Payment of this fee shall be made in the form of a check or money order, made payable in U.S. funds to the National Flood Insurance Program, or by credit card. The payment must be forwarded to the following address: Federal Emergency Management Agency Fee-Collection System Administrator P.O. Box 3173 Merrifield, VA 22116-3173 • As-built plans, certified by a registered professional engineer, of all proposed project elements • Community acknowledgment of the map revision request from your community and the City of Carrollton • Certification that all fill placed in the currently effective base floodplain and below the proposed BFE is compacted to 95 percent of the maximum density obtainable with the Standard Proctor Test method issued by the American Society for Testing and Materials (ASTM Standard D-698)or an acceptable equivalent method for all areas to be removed from the base floodplain • Hydraulic analyses, for as-built conditions, of the base flood, the 0.2-percent-annual-chance flood, and regulatory floodway, if they differ from the proposed conditions models After receiving appropriate documentation to show that the project has been completed, FEMA will initiate a revision to the FIRM. This CLOMR 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. 3 If you have any questions regarding floodplain management regulations for your community or the NFIP in general, please contact the Consultation Coordination Officer (CCO) for your community. Information on the CCO for your community may be obtained by contacting the Director, Mitigation Division of FEMA in Denton, Texas, at(817)89 8-5127. If you have any technical questions regarding this CLOMR, 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. Sincer• Frederic. H Si • • ks, Jr., Chief A-Hazard Identification Branch Mitigation Directorate cc: The Honorable Gary Blaancet Mayor, City of Carrollton Mr. Kenneth Griffin, P.E. Director of Engineering&Public Works City of Coppell Mr. Mark D. Walter, P.E. Nathan D. Maier Consulting Engineers, Inc. Appendix 1 CLOMR Report (On Attached Disk) Appendix 2 LOMR Case 10-06-3039P — 480195 FEMA Approval Letter Page 1 of 4 Issue Date: May 19,2011 Effective Date: June 20,2011 Case No.: 10-06-3039P LOMR-APP Follows Conditional Case No.: 06-06-A595R tvARLtj r- Federal Emergency on, D Management.C. 20472 Agency Cliff/ .'gND D stc. LETTER OF MAP REVISION DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION BASIS OF REQUEST City of Lewisville FILL FLOODWAY Denton County HYDRAULIC ANALYSIS Texas NEW TOPOGRAPHIC DATA COMMUNITY COMMUNITY NO.: 480195 IDENTIFIER Lewisville Railroad Park APPROXIMATE LATITUDE AND LONGITUDE: 33.038,-96.962 SOURCE: Precision Mapping Streets DATUM: NAD 83 ANNOTATED MAPPING ENCLOSURES ANNOTATED STUDY ENCLOSURES TYPE: FIRM' NO.: 48121C0565 G DATE: April 18,2011 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: April 18,2011 PROFILES: 74P AND 75P FLOODWAY DATA TABLE: 8 Enclosures reflect changes to flooding sources affected by this revision. *FIRM-Flood Insurance Rate Map FLOODING SOURCE AND REVISED REACH Elm Fork Trinity River-from approximately 7,950 feet downstream of State Highway 121 to approximately 50 feet downstream of State Highway 121 SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases Elm Fork Trinity River Zone AE Zone AE YES YES Zone X(shaded) Zone X(shaded) YES YES Floodway Floodway NONE YES BFEs` BFEs NONE YES •BFEs-Base Flood Elevations DETERMINATION This document provides the determination from the Department of Homeland Security's Federal Emergency Management Agency(FEMA) regarding a request for a Letter of Map Revision(LOMR)for the area described above. Using the information submitted,we have determined that a revision to the flood hazards depicted in the Flood Insurance Study(FIS)report and/or National Flood Insurance Program(NFIP)map is warranted. This document revises the effective NFIP map,as indicated in the attached documentation. Please use the enclosed annotated map panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals in your community. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document,please contact the FEMA Map Assistance Center toll free at 1-877-336-2627(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,7390 Coca Cola Drive,Suite 204,Hanover,MD 21076. Additional Information about the NFIP is available on our Web site at httpJ/www.fema.gov/business/nfip. 7/ /Pk- Michael J.McGinn,Program Specialist 10-06-3039P Page 2 of 4 Issue Date: May 19,2011 Effective Date:June 20,2011 Case No.: 10-06-3039P LOMR-APP Federal Emergency Management Agency °-UWashington, D.C. 20472 <9ND SE:V LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) COMMUNITY INFORMATION APPLICABLE NFIP REGULATIONS/COMMUNITY OBLIGATION We have made this determination pursuant to Section 206 of the Flood Disaster Protection Act of 1973(P.L.93-234)and in accordance with the National Flood Insurance Act of 1968,as amended(Title XIII of the Housing and Urban Development Act of 1968,P.L.90448), 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 NFIP criteria. These criteria,including adoption of the FIS report and FIRM,and the modifications made by this LOMR,are the minimum requirements for continued NFIP participation and do not supersede more stringent State/Commonwealth or local requirements to which the regulations apply. We provide the floodway designation to your community as a tool to regulate floodplain development. Therefore,the floodway revision we have described in this letter,while acceptable to us, must also be acceptable to your community and adopted by appropriate community action,as specified in Paragraph 60.3(d)of the NFIP regulations. COMMUNITY REMINDERS We based this determination on the 1-percent-annual-chance flood discharges computed in the FIS for your community without considering subsequent changes in watershed characteristics that could increase flood discharges. Future development of projects upstream could cause increased flood discharges,which could cause increased flood hazards. A comprehensive restudy of your community's flood hazards would consider the cumulative effects of development on flood discharges subsequent to the publication of the FIS report for your community and could,therefore,establish greater flood hazards in this area. Your community must regulate all proposed floodplain development and ensure that any permits required by Federal or State/Commonwealth law have been obtained. State/Commonwealth or community officials,based on knowledge of local conditions and in the interest of safety, may set higher standards for construction or may limit development in floodplain areas. If your State/Commonwealth or community has adopted more restrictive or comprehensive floodplain management criteria,those criteria take precedence over the minimum NFIP requirements. We will not print and distribute this LOMR to primary users,such as local insurance agents or mortgage lenders;instead,the community will serve as a repository for the new data. We encourage you to disseminate the information in this LOMR by preparing a news release for publication in your community's newspaper that describes the revision and explains how your community will provide the data and help interpret the NFIP maps. In that way,interested persons,such as property owners,insurance agents,and mortgage lenders,can benefit from the information. This revision has met our criteria for removing an area from the 1-percent-annual-chance floodplain to reflect the placement of fill. However,we encourage you to require that the lowest adjacent grade and lowest floor(including basement)of any structure placed within the subject area be elevated to or above the Base(1-percent-annual-chance)Flood Elevation. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document,please contact the FEMA Map Assistance Center toll free at 1-877-336-2627(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,7390 Coca Cola Drive,Suite 204,Hanover,MD 21076. Additional Information about the NFIP is available on our Web site at http://www.fema.gov/businessinfip. Michael J.McGinn,Program Specialist Page 3 of 4 Issue Date: May 19,2011 Effective Date:June 20,2011 Case No.: 10-06-3039P LOMR-APP O4 ASR\BI,- UFederal Emergency Management Agency Washington, D.C. 20472 ; ' ND Sti LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) We have designated a Consultation Coordination Officer(CCO)to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO,please contact: Mr.Frank Pagano Director,Mitigation Division Federal Emergency Management Agency,Region VI Federal Regional Center,Room 206 800 North Loop 288 Denton,TX 76209 (940)898-5127 STATUS OF THE COMMUNITY 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 panels and FIS report warrant physical revision and republication in the future, we will incorporate the modifications made by this LOMR at that time. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document,please contact the FEMA Map Assistance Center toll free at 1-877-336-2627(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,7390 Coca Cola Drive,Suite 204,Hanover,MD 21076. Additional Information about the NFIP is available on our Web site at httpi/www.fema.govibusiness/nfip. Michael J.McGinn,Program Specialist Page 4 of 4 Issue Date: May 19,2011 Effective Date: June 20,2011 Case No.: 10-06-3039P LOMR-APP ,vpary"U 4" Federal Emergency Management Agency Washington, D.C. 20472 LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) PUBLIC NOTIFICATION OF REVISION PUBLIC NOTIFICATION BFE(METERS NAVD 88) MAP PANEL FLOODING SOURCE LOCATION OF REFERENCED ELEVATION EFFECTIVE REVISED NUTABER(S) Elm Fork Trinity River Approximately 4,850 feet downstream of State 460 459 48121C0565G Highway 121 Approximately 900 feet downstream of State Highway 461 460 48121C0565G 121 Within 90 days of the second publication in the local newspaper,a citizen may request that we reconsider this determination. Any request for reconsideration must be based on scientific or technical data. This revision will become effective 30 days from the date of this letter. However,until the 90-day period has elapsed,the revised BFEs presented in this LOMR may be changed. A notice of changes will be published in the Federal Register. A short notice also will be published in your local newspaper on or about the dates listed below. Please refer to FEMA's Web site at https://www.floodmaps.fema.gov/fhm/Scripts/bfe_main.asp for a more detailed description of proposed BFE changes,which will be posted within a week of the date of this letter. LOCAL NEWSPAPER Name: Denton Record-Chronicle Dates: 05/26/2011 and 06/02/2011 This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document,please contact the FEMA Map Assistance Center toll free at 1-877-336-2627(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,7390 Coca Cola Drive,Suite 204,Hanover,MD 21076. Additional Information about the NFIP is available on our Web site at httpl/www.fema.gov/business/nfip. /y j� I/k rvAL�- Michael J.McGinn,Program Specialist In ru on000 o r- ki CL o a 7 � O r, < a 14 = 0 0 0 0 6 o c U z d Y. .r en Z 3 O N M 'S O N O r 3 I.> h ';v.h v a v a a O m F d e.ll 0 'L ., % J � C.) it eie ce 0 d 13.1 0 E E- ` a .n [ N t 1- r- . vi oo — N h m a L = �� � � �v � � L CI E • y C •L L ¢ F, 0} d .Y, a F N .n t� N t- r L {y 0 o -a h u0 — N <Y h O vri vim', 7 C V 'V' <t Q �1 k7 > r a w 0 W a 0 } c N S~ O N u 'J x O c O sP. V' oc N kJ N N - - r (•1 V h a. --.1>- Q U E-- ¢ 3 a F v W U ❑ ,_1 L.1.) O a >> LI LL, • a. r- r en O N Fi. C.L, U en'.- O 7 r- m Z v = [� N N 1I'1 N O. x L�TAr� V la co: a d p Z .411 LT. AO LSI gl (-4 N h N a N N ri > d ti 0 14 Q , , , , _, „ F � p0 i - U QM z � � 'I' an -0 � zU F 7 01. 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J Ili , 111;11 1 ;!till arlj! Li 1 1 Ii°a 3 t [ n 81 I l 1111 ! dj 2 I R to lUli!i t H ° 3 a ° 1 1r1, li, a li Bl1 al 11tag i! I g tjt !`Ij 11( .Fll'1 is Iiji 4 a j $t ;;1S1fi , #I amq a;j1 1111 ; 1. p'6 it j@ 1:1.1/ Iii l g fE l° j i 7�E 8 �ij* n2+, ��% �aLf� f .e'�'� {§ I ���¢�� n I !t t! 3``g f , 1r1i 21'll i F ! aiI ° : ' a !L`g o f n =it'lll:IyI tiliill 1 Il $l t .aai3„1.,1 y I l[k $ iJI ij t 1! I 11 '1 ! laj 41 1i l Efi a ft 16 1 111 1.1111i a1 111 II 11111 i! Ii aI!' JdI 11 1 r 1111; g 1 fl IyI ;[�°ia 1Il 11=] ll ; At i 'I'! t j tid 8 1 l li I®III 1t la j Ija 12 ! l ia1l ii$d 11alllll ! 1111 :l 11: 'e . e Appendix 2 LOMR Case 10-06-3039P — 480195 (On Attached Disk) f LA/VC Ate` o C reek . ,.... _..,,� -..rte .t r I "Apr 704 i r rCIT OF CC�PPELL leczt,ii� .� 41301'70 1,111P1..." ':iri,,.►v 1111W at Op ZONE/AE . 1\14 ;Abe- ior)4Pairr —11115" u) ' `� ZONE AE z ...414,_,410P. 1 r.,t it illaver.f.,,,r1A1P-00" ,■,'„,,i 44-4- -4411111.,_ ...-- >z( COLONIAL I'- ZONE X ,_, . . ---- STREET RQ� °' $rrd e �.��`�-- f 111rAl -4 10 )C) N- 4, GLAD -11 T DRIVE ' ' iI ....„al ZONE X ROAD + �,co f_. pFpRD �1. �� ZONE X ��RJE PEBBLE C!?EEK DRIVE I � I t. t'r_`,r�„""...0 / o-fl 8At t cr���_ti�.^ 4 A9 MAP SCALE 1” = 1000' 500 0 1000 2000 FEET Appendix 3 As-Built Floodway HECRAS Model (On Attached Disk) Appendix 3 Preliminary Grading Plan N�4 °02512„E S;7 135 BENCHMARK INFORMATION TBM — "X" SET ON CURB INLET LOCATED ON THE NORTH SIDE OF SANDY LAKE ROAD APPROXIMATELY 105 FEET EAST OF RIVERVIEW DRIVE. ELEVATION = 448.66 NOTES: 1. CITY OF COPPELL CONSTRUCTION STANDARDS APPLY WHETHER INDICATED ON THESE PLANS OR NOT. 2. THE PROPOSED FLOODPLAIN GRADING REFLECTS THE CONTOURS IDENTIFIED IN THE FLOOD STUDY IN SUPPORT OF A LETTER OF MAP REVISION AS PREPARED BY MORRISON HYDROLOGY LLC DATED MAY 7, 2012. - ��� 442--, � \ V� N J\_ o \ �V V \' w ' I C' \\. /� _. 39, City ni ipal Carrollton rpo N�� / 7/ /6 17•21' a Texas Municipal Cor oration Volume 91226, Page 332 F f // j /4 I'I D.R.D.C.T. L � � X840,,3 Denton Creek �nP?ROxIM oTE of 0 IRON ROD FOUND si.R. SET IRON ROD a I F.C. P. FENCE CORNER POST O Nx'� Q 0 — > Q }= (71O U� LIGHT POLE _O mrn O -- F N � _(5 FIRE HYDRANT 0 w WATER METER M TOP OF CURB G 0 m TOP OF PAVEMENT c O NATURAL GROUND N TOP OF WALL sw BOTTOM OF WALL --- xxx - -- EXISTING CONTOURS xxx PROPOSED CONTOURS W- w0P EX. 24' ACCESS ESMT LLJ -L- c~n>-z,a� / I utllip� P v�001z0� I EX. DRAINAGE E SMM T — I VOL. 2002088, PG. 6315 a2_UWO S89 °57'29 "W 115 77 - a __ —____ _ ._�OW = 1 0 ? 450 — 451 - - - 448 I I � i� 0 u I �I x A A O T: N I % Carrollton— Farmers Branch �) Ii Independent School District PROPOSED LIMITS OF x Volume 80230, Page 510 � D.R.D. C. T. 100 —YR FLOODPLAIN (remainder) (WSE= 444.00) ZONED AGRICULTURAL x 43a x �I w m 0 � x x 440 d� -� I x --•x - 442 444.. ��-t, ✓ 446 -444--- — - -- - -- , -- — Jm / 442_ / I 443 _ _..- --- -- - - - - -- — —,_ r 4' �-. _ -- _ - -_ _- - __- - �i]HP_ ----TP y'_��FIP -.- OH P q5_ OHP 444 = ORP _ ,OHP — BHP — OHP --�i ° f :!1 GRADING LEGEND R. F. IRON ROD FOUND si.R. SET IRON ROD 'X" I F.C. P. FENCE CORNER POST / ASPHALT � q > POWER POLE ( LIGHT POLE FF= 452.00 WATER VALVE (C)SSMH � _(5 FIRE HYDRANT 0 w WATER METER a TOP OF CURB G GUTTER TP TOP OF PAVEMENT NG NATURAL GROUND Tw TOP OF WALL sw BOTTOM OF WALL --- xxx - -- EXISTING CONTOURS xxx PROPOSED CONTOURS W- w0P LLJ c~n>-z,a� P v�001z0� � a2_UWO o cnWaZ0 I a C) U O � a 0z0zv -j Waco a > ��- of �- a O J L 44 a\ ian am r Hf ®_ -- — — -- — -- — -- — — = 11 -- - Al V.L 450 -- EL =448 66 449 -_ -- 6 W 847.3 d I I � i� 0 u I �I x A A O T: N I % Carrollton— Farmers Branch �) Ii Independent School District PROPOSED LIMITS OF x Volume 80230, Page 510 � D.R.D. C. T. 100 —YR FLOODPLAIN (remainder) (WSE= 444.00) ZONED AGRICULTURAL x 43a x �I w m 0 � x x 440 d� -� I x --•x - 442 444.. ��-t, ✓ 446 -444--- — - -- - -- , -- — Jm / 442_ / I 443 _ _..- --- -- - - - - -- — —,_ r 4' �-. _ -- _ - -_ _- - __- - �i]HP_ ----TP y'_��FIP -.- OH P q5_ OHP 444 = ORP _ ,OHP — BHP — OHP --�i ° f :!1 GRADING LEGEND R. F. IRON ROD FOUND si.R. SET IRON ROD 'X" CUT X IN CONCRETE F.C. P. FENCE CORNER POST ASPHALT ( TELEPHONE MANHOLE POWER POLE ( LIGHT POLE WATER VALVE (C)SSMH SANITARY SEWER MANHOLE _(5 FIRE HYDRANT 0 w WATER METER TC TOP OF CURB G GUTTER TP TOP OF PAVEMENT NG NATURAL GROUND Tw TOP OF WALL sw BOTTOM OF WALL --- xxx - -- EXISTING CONTOURS xxx PROPOSED CONTOURS ' THE CONTRACTOR SHALL CONTACT DIG -TESS AT 1- 800 - 344 -8377 A MINIMUM OF 48 HOURS PRIOR TO THE COMMENCEMENT OF ANY CONSTRUCTION ACTIVITIES m / N 0 ILL z U] Lim Q� w — ^oW°' F0 Z MO WNO W ��3ZW W[AW0I J I Ww�a3 ZNI3 L9 [LXko TZamro iW�❑0) 0. PRELIMINARY PLANS THIS DOCUMENT IS FOR INTERIM REVIEW AND IS NOT INTENDED FOR CONSTRUCTION, BIDDING OR PERMIT PURPOSES. STEVEN R. HOMEYER, PE # 86942 DATE: 0510912012 Q Q 0— \W Z / C) J DRAWN:SRH DATE: 11/11/11 HEI #: 11 -121 SHEET NO: C3 Z Z J O U) 5; J W- w0P LLJ c~n>-z,a� v�001z0� a2_UWO cnWaZ0 a C) U O a 0z0zv -j Waco a > ��- of �- a O J PRELIMINARY PLANS THIS DOCUMENT IS FOR INTERIM REVIEW AND IS NOT INTENDED FOR CONSTRUCTION, BIDDING OR PERMIT PURPOSES. STEVEN R. HOMEYER, PE # 86942 DATE: 0510912012 Q Q 0— \W Z / C) J DRAWN:SRH DATE: 11/11/11 HEI #: 11 -121 SHEET NO: C3 Appendix 4 FEMA Forms DEPARTMENT OF HOMELAND SECURITY FEDERAL EMERGENCY MANAGEMENT AGENCY O.MB.NO.1660-0016 OVERVIEW& CONCURRENCE FORM r February 28,2014 PAPERWORK BURDEN DISCLOSURE NOTICE Public reporting burden for this form is estimated to average 1 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 it displays a valid OMB control number.Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to:Information Collections Management,Department of Homeland Security, Federal Emergency Management Agency, 1800 South Bell Street, Arlington, VA 20958-3005, Paperwork Reduction Project (1660-0016).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. PRIVACY ACT STATEMENT AUTHORITY:The National Flood Insurance Act of 1968,Public Law 90-448,as amended by the Flood Disaster Protection Act of 1973,Public Law 93-234. PRINCIPAL PURPOSE(S):This information is being collected for the purpose of determining an applicant's eligibility to request changes to National Flood Insurance Program(NFIP)Flood Insurance Rate Maps(FIRM). ROUTINE USE(S):The information on this form may be disclosed as generally permitted under 5 U.S.0§552a(b)of the Privacy Act of 1974,as amended.This includes using this information as necessary and authorized by the routine uses published in DHS/FEMA/NFIP/LOMA-1 National Flood Insurance Program(NEAP);Letter of Map Amendment(LOMA)February 15,2006,71 FR 7990. DISCLOSURE:The disclosure of information on this form is voluntary;however,failure to provide the information requested may delay or prevent FEMA from processing a determination regarding a requested change to a(NFIP)Flood Insurance Rate Maps(FIRM). A. REQUESTED RESPONSE FROM DHS-FEMA This request is for a: (check one) D CLOMR: A letter from DHS-FEMA commenting on whether a proposed project,rT built as proposed,would justify a map revision,or proposed hydrology changes (See 44 CFR Ch.1,Parts 60,65&72). © LOMR: A letter from DHS-FEMA officially revising the current NFIP map to show the changes to floodplains,regulatory floodway,or flood elevations.(See 44 CFR Ch.1,Parts 60,65&72). B. OVERVIEW 1. The NFIP map panel(s)affected for all impacted communities is(are): Community No. Community Name State Map No. Panel No. Effective Date Ex: 480301 City of Katy TX 48473C 0005D 02108/83 480287 Harris County TX 48201C 02206 09/28/90 480170 CITY OF COPPELL,DALLAS CO. TX 48113C 0155J 08/23/01 2. a Flooding Source: ELM FORK OF THE TRINITY RIVER ©Riverine ❑Coastal ❑Shallow Flooding(e.g,Zones AO and AH) b.Types of Flooding: DAlluvial fan ❑takes ❑Other(Attach Description) 3.Project Name/identifier RIVER OAKS ASSISTED LIVING AND MEMORY CARE FACILITY 4.FEMA Zone designations affected:AE (Choices A,AH,AO,Al-A30,A99,AE,AR,V,V1-V30,VE,B,C,D,X) 5. Basis for Request and Type of Revision: LOMR FEMA Form 086-0-27,(2/2011) Previously FEMA Form 81-89 MT-2 Form 1 Page 1 of 3 a.The basis for this revision request is(check all that apply) ®Physical Change ['Improved Methodology/Data ❑Regulatory Floodway Revision ©Base Map Changes El Coastal Analysis ©Hydraulic Analysis ['Hydrologic Analysis ❑Corrections ❑Weir-Dam Changes ❑Levee Certification ['Alluvial Fan Analysis ❑Natural Changes [New Topographic Data ['Other(attach Description) Note: A photograph and narrative description of the area of concern is not required,but is very helpful during review. b.The area of revision encompasses the following structures(check all that apply) Structures: ❑Channelization ❑Levee/Floodwall ❑Bridge/Culvert ['Dam ®Fitt Daher(Attach Description) 6. ❑ Documentation of ESA compliance is submitted(required to initiate CLOMR review).Please refer to the instructions for more information C. REVIEW FEE Has the review fee for the appropriate request category been included? ©Yes, Fee Amount jiff dPesp. ❑No,Attach Explanation Please see the DHS-FEMA website at http://fema.gov/plan/preventMum/frm fees.shtm for Fee Amounts and Exemptions. D. SIGNATURE 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. Name Company RONALD W. MORRISON, P.E., CFM MORRISON HYDROLOGY, LLC Mailing Address Daytime Telephone No. FAX No. 861 HCR 1313 254-580-9636 /,,"/ HILLSBORO,TX.76645 EMAIL ADDRESS rmorrison @mhydrology.com .ignatu •. R=, r ( e uyed) of 1LiUt ,/ - ' Da te 502012 As i •• unity unity• .'-I responsible L flooddplai management,I hereby acknowledge that we have received and reviewed this Letter of of Map Revision(LOMR)or conditional LOMR 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 for when fill is placed in the regulatory floodway, and that all necessary Federal,State,and local permits have been,or in the case of a conditional LOMR,will be obtained.For conditional LOMR request,the applicant has documented Endangered Species Act (ESA)compliance to DHS/FEMA prior to DHSIFEMA's review of the Conditional LOMR application.For LOMR request,I acknowledge that compliance with sections 9 and 10 of the ESA has been achieved independently of DHS/FEMA's process. For actions authorized,funded,or being carried out by Federal or State agencies, documentation from the agency showing its compliance with Section 7(a)(2)of the ESA will be submitted.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 44 CFR 65.2(c),and that we have available upon request by DHS/FEMA,all analyses and documentation used to make this determination. Community Official's Name and Title Community Name Mailing Address Daytime Telephone No. FAX No. EMAIL ADDRESS Community Official's signature(required) Date i FEMA Form 086-0-27,(2/2011) Previously FEMA Form 81-89 MT-2 Form 1 Page 2 of 3 CERTIFICATION BY REGISTRATION PROFESSIONAL ENGINEER AND/OR LAND SURVEYOR This certification is to be signed and sealed by a licensed land surveyor,registered professional engineer,or architect authorized by law to certify elevation information data,hydrologic and hydraulic analysis,and any other supporting information as per NFIP regulations paragraph 652(b)and as described in the MT-2 Forms instruction. 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. Certifiers Name License No. Expiration Date RONALD W. MORRISON, P.E., CFM 36651 $3J3o/ o13 Company Name Telephone No. Fax No. MORRISON HYDROLOGY, LLC ,f1 a 5*-510'14 3 6 Sign re //J/� �/!j f�//9� �G� E-mail Address Date / /1., ! L/" 'UL%[� L-^--rmorrison@mhydrology.com 5/8/2012 Ensure the toms that are appropriate to your revision request are included in your submittal. Form name and(Number) Required if..... Riverine Hydrology&Hydraulics Form(Form 2) New or revised discharges or water-surface elevations ['Riverine Structures Form(Form 3) Channel is modified,addition/revision of bridge/culverts, addition/revision of levee/floodwall,addition/revision of dam ❑Coastal Analysis Form(Form 4) New or revised coastal elevations ❑Coastal Structures Form(Form 5) Addition/revision of coastal structure Seal(optional) ['Alluvial Fan Flooding Form(Form 6) Flood control measures on alluvial fans FEMA Form 086-0-27,(2/2011) Previously FEMA Form 81-89 MT-2 Form 1 Page 3 of 3 DEPARTMENT OF HOMELAND SECURITY O.M.B.NO, 1660-0016 FEDERAL EMERGENCY MANAGEMENT AGENCY Expires February 28,2014 RIVERINE HYDROLOGY & HYDRAULICS FORM PAPERWORK BURDEN DISCLOSURE NOTICE Public reporting burden for this form is estimated to average 3.5 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 burden estimate and any suggestions for reducing this burden to: Information Collections Management, Department of Homeland Security, Federal Emergency Management Agency, 1800 South Bell Street, Arlington VA 20958-3005, Paperwork Reduction Project(1660-0016).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. PRIVACY ACT STATEMENT AUTHORITY:The National Flood Insurance Act of 1968,Public Law 90-448,as amended by the Flood Disaster Protection Act of 1973,Public Law 93-234. PRINCIPAL PURPOSE(S):This information is being collected for the purpose of determining an applicants eligibility to request changes to National Flood Insurance Program(NFIP)Flood Insurance Rate Maps(FIRM). ROUTINE USE(S):The information on this form may be disclosed as generally permitted under 5 U.S.0§552a(b)of the Privacy Act of 1974,as amended.This includes using this information as necessary and authorized by the routine uses published in DHS/FEMA/NFIP/LOMA-1 National Flood Insurance Program(NFIP);Letter of Map Amendment(LOMA)February 15,2006,71 FR 7990. DISCLOSURE:The disclosure of information on this form is voluntary;however,failure to provide the information requested may delay or prevent FEMA from processing a determination regarding a requested change to a NFIP Flood Insurance Rate Maps(FIRM). Flooding Source: ELM FORK OF THE TRINITY RIVER Note: Fill out one form for each flooding source studied. A. HYDROLOGY 1. Reason for New Hydrologic Analysis(check all that apply) © Not revised(skip to section B) ❑ No existing analysis ❑ Improved data ❑ Alternative methodology ❑ Proposed Conditions(CLOMR) ❑ Changed physical condition of watershed 2. Comparison of Representative 1%-Annual-Chance Discharges Location Drainage Area(Sq.Mi.) Effective FIS(cfs) Revised(cfs) 3. Methodology for New Hydrologic Analysis(check all that apply) ❑Statistical Analysis of Gage Records ❑ Precipitation/runoff Model Specify Model ❑Regional Regression Equations ❑Other(please attach description) Please enclose all relevant models in digital format maps,computations(including computation of parameters),and documentation to support the new analysis. 4. Review/Approval of Analysis. If your community requires a regional,state,or federal agency to review the hydrologic analysis,please attach evidence of approval/review. 5. Impacts of Sediment Transport on Hydrology Is the hydrology for the revised flooding source(s)affected by sediment transport? ❑Yes ❑ No If Yes,then fill out Section F(Sediment Transport)of Form 3. If No,then attach your explanation for why sediment transport was not considered. FEMA Form 086-0-27A,(212011) Previously FEMA Form 81-89 MT-2 Form 2 Page 1 of 3 B. HYDRAULICS 1. Reach to be Revised Water-Surface Elevations(ft.) Description Cross Section Effective Proposed/Revised Downstream Limit EF3 93196 442.28 442.28 Upstream Limit EF3 97919 447.44 447.44 *Proposed/Revised elevations must tie-into the Effective elevations within 0.5 foot at the downstream and upstream limits of revision. 2. Hydraulic Method/Model Used HEC-RAS 3. Pre-Submittal Review of Hydraulic Models DHS/FEMA has developed two review programs,CHECK-2 and CHECK-RAS to aid in the review of HEC-2 and HEC-RAS hydraulic models, respectively. We recommend that you review your HEC-2 and HEC-RAS models with CHECK-2 and CHECK-RAS. 4. Models Submitted Natural Run Floodway Run Datum Duplicate Effective Model* File Plan File Plan Name Name ! Name Name Corrective Effective Model* Name Nan*— (" �� eY Name Existing or Pre Project File �2� le Plan Conditions Model Name Name ni ame Name Revised or Post-Project File Plan File Plan Conditions Model Name Name Name Name File Plan U File Plan Other-(attach description) Name Name Name Name *For details,refer to the corresponding section of the instructions. �( Digital Models Submitted?(Required) C. MAPPING REQUIREMENTS A certified topographic map must be submitted showing the following information(where applicable):the boundaries of the effective,existing,and proposed conditions 1%-annual-chance floodplain(for approximate Zone A revisions)or the boundaries of the 1%-and 0.2%-annual-chance floodplains and regulatory floodway(for detailed Zone AE,AO,and AH revisions);location and alignment of all cross sections with stationing control indicated;stream,road,and other alignments(e.g.dams,levees,etc.);current community easements and boundaries;boundaries of the requester's property;certification of a registered professional engineer registered in the subject State;location and description of reference marks;and the referenced vertical datum(NGVD,NAVD,etc.). Digital Mapping(GIS/CADD)Data Submitted Topographic Information 2-FOOT TOPO FROM NCTCG AND HOLMEYER 1 FT SURVEY INFORMATION IN THE PROJECT AREA Source Date Jan 1,2012 Accuracy Note that the boundaries of the existing or proposed conditions floodplains and regulatory floodway to be shown on the revised FIRM and/or FBFM must tie-in with the effective floodplain and regulatory floodway boundaries. Please attach a copy of the effective FIRM and/or FBFM,at the same scale as the original,annotated to show the boundaries of the revised 1%-and 0.2%-annual-chance floodplains and regulatory floodway that tie-in with the boundaries of the effective 1%-and 0.2%-annual-chance floodplain and regulatory floodway at the upstream and downstream limits of the area on revision. F Annotated FIRM and/or FBFM(Required) FEMA Form 086-0-2TA,(2/2011) Previously FEMA Form 81-89 MT-2 Form 2 Page 2 of 3