Storm Water Mgmt-SY081008
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Table of Contents
Section
Paee
I. EXECUTIVE SUMMARY ....................................................................................2
II. SCOPE OF SER VI CES .......................................................................................... 2
III. LIMIT A TI ON ....................................................... ................ ............................ ...... 2
IV. OBSERVATIONS ..................................................................................................2
A. Sumps...........................................................................................................2
B. Box Culverts Under Riverchase Drive ......................................................16
C. Glory Holes ................................... .............................................................16
D . Spillways................ .................................... ........................ ....................... .18
E. Outfall to the East Fork of the Trinity River........................................~.....23
F. General Observations ........................................................ ........................ .27
V . RECOMMENDATIONS ...................................................................................... 31
Appendix A Facility and Maintenance Summary ......................................................... 32
Appendix B Site Map ........... ......................................... .................... ............................ 35
Appendix C Sump TOP OF BANK & Sediment Accumulation .................................. 37
Appendix D Projected Maintenance, Engineering and NPDES/TPDES Costs............. 43
I. EXECUTIVE SUMMARY
Nathan D. Maier Consulting Engineers, Inc. (NDMCE) was retained by the Northwest Dallas
County Flood Control District (District) to perform a status review of the District's facilities
and structures. The District is generally located in and around the Riverchase Golf Course in
the City of Coppell, Texas (see Appendix B "Site Map").
In general, all of the District's facilities are functioning properly and are in good condition.
NDMCE visually reviewed the status of all above ground facilities (intake structure, spillway
structures, glory hole intakes, sump banks, swales and outfall structure) within the District.
Observation of the performance of below grade structures was noted, but the facilities below
grade (box culverts, headwalls and storm sewer piping between sumps) were not visually
reviewed for this report because they are either submerged or buried and are not accessible.
Silt was probed in Sumps 2,9, 10, 11 and 14 to evaluate re-sedimentation rates since those
sumps and associated box culverts were cleaned in 2004 through 2006. Negligible sediment
accumulation was noted. The sediment accumulations are documented in Appendix C.
II. SCOPE OF SERVICES
NDMCE is providing engineering services to the District. These services include:
l. Performing a site reconnaissance of the District's structures and facilities.
2. Drafting a report identifying the condition of the District's structures and facilities.
3. Updating the 5 year maintenance schedule
4. Attending a board meeting to answer any questions the District has concerning this
report.
III. LIMITATION
This report was prepared for the District. All information within this report is confidential
and may not be reproduced or conveyed in any fashion without the expressed written consent
of the District, and NDMCE. This report was prepared using generally accepted engineering
practices and no other warranty is expressed or implied.
IV. OBSERVATIONS
The following are photographs and comments from NDMCE's observations. Refer to
Appendix A, Site Map, for photograph locations and facilities described.
A. Sumps
Sumps determined to have an impact on the hydraulic performance of the District's facilities
have had sediment removed. Sediment was removed from Sump II in 2004. Sediment was
removed from Sumps 9 and 10 in 2006. Work to remove sediment from Sumps 2 and 14 was
completed in early 2007.
2
Sediment accumulation was noted in all of the recently dredged Sumps. See Appendix C.
Sediment levels are minor and pose no concern at this time. Accumulations appear to
have changed very little from observations made in 2007. Some minor erosion was noted
along the banks of the sumps but does not appear to be a significant contributor to
sediment accumulation at this time.
Erosion along the banks of sumps was evident at headwalls outfalling into sumps as well
as at the intake structure in Sump 3A.
Storm water levels were very high in 2007. Some minor slope failure was noted along the
banks of Sump 3A last year. Vegetation growth prevented observation of these areas in
detail for this review, but no signs were evident that this condition has worsened.
Aquatic vegetation was noted in Sumps 13 and 14 in 2007. No significant aquatic
vegetation was observed for this review.
The intake for the box culvert under MacArthur Boulevard outfalling into Sump II is
becoming overgrown with vegetation. This area has been cleaned by the City on multiple
occasions. The vegetation is not dense enough to significantly impede the flow of storm
water at this point, but the condition will continue to worsen over time.
A sinkhole over the box culvert outfalling into Sump II was noted. It was also noted in
our report dated August 2006 and in the 2007 report. It did not appear to grow in size
since the last observation, but is likely the result of some type of void in the box culvert
allowing the infiltration of soil and water.
Debris was noted in Sump II near the box culvert outfall.
Previously noted cart path bridge erosion has been repaired by Riverchase Golf Course.
3
Photograph 1
Sloughing along Bank at Southeast Corner of Sump lA
Photograph 2
Sloughing along East and West Banks of Sump lA
4
Photograph 3
Sloughing along West Bank Sump ~A
Photograph 4
Sloughing along Northwest Corner of Sump 2A
5
Photograph 5
Erosion and Slope Failure South Bank of Sump 3A
Photograph 6
Erosion and Slope Failure South Bank of Sump 3A
6
Photograph 7
Erosion and Slope Failure South Bank of Sump 3A
Photograph 8
Erosion at Gabion Mattress on East Bank of Sump 3A
7
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Photograph 9
Sloughing along South Bank of Sump 9
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Photograph 10
Sloughing along South Bank of Sump 9
8
Photograph 11
Sloughing along South Bank of Sump 10
Photograph 12
Sloughing along South Bank of Sump 10
9
Photograph 13
Sloughing along East Bank of Sump 18
Photograph 14
Box Culvert Intake for Culvert under MacArthur Blvd
10
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Photograph 15
Sinkhole over Box Culvert that Outfalls into Sump 11
Photograph 16
Box Culvert Outfall in Sump 11
11
Photograph 17
Sloughing on South Bank of Sump 11
Photograph 18
Erosion at RCP Headwall in Sump 11
12
Photograph 19
Aquatic Vegetation and Sloughing on Bank at Southeast Corner of Sump 13
Photograph 20
Sloughing on Bank at Northeast Corner of Sump 13
13
Photograph 21
Cart Bridge on Sump 13
Photograph 22
Sump 14
14
Photograph 23
Sloughing at Northeast Corner of Sump 14
Photograph 24
Erosion at Southeast Corner of Sump 2
15
B. Box Culverts Under Riverchase Drive
Both the 5-8x4 box culverts (Line A, between Sumps 2 and 14) and the 4-8x4 box
culverts (Line B, between Sumps 9 and 10) had silt accumulation removed in 2005-2006.
Since the box culverts are submerged, no additional observations were made as to the
overall condition of the structures. Sediment accu mulations along the intakes and
outfalls of the box culverts ~ere probed by NOM survey. See Appendix C. Based on that
information, sediment accumulation in the box culverts does not appear to be a concern at
this time.
C. Glory Holes
Visible portions of all three Glory Holes appear to be in generally good condition.
Vegetation and debris are blocking the openings in Sumps 2, 13 and 18.
Photograph 25
Glory Hole at Sump 2
16
Photograph 26
Glory Hole at Sump 13
Photograph 27
Glory Hole at Sump 18
17
D. Spillways
All spillway structures were replaced in 2002 and 2004. No concerns were noted during
this observation and the structures appear to be in good condition. There is a hole behind
Gabion Spillway 5 with standing water. Vegetation was noted growing in close proximity
to Spillways 1,2,3,5 and 6.
Photograph 28
Gabion Spillway 1 at Snmp lA
18
Photograph 29
Gabion Spillway 1 at Sump 1A
Photograph 30
Gabion Spillway 2 at Sump 14
19
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Photograph 31
Gabion Spillway 3 at Sump 13
Photograph 32
Gabion Spillway 4 at Sump 3A
20
Photograph 33
Drain behind Gabion Spillway 5 at Sump 10
Photograph 34
Gabion Spillway 5 at Sump 10
21
Photograph 35
Gabion Spillway 6 at Sump 18
Photograph 36
Low Area Behind Gabion Spillway 6 at Sump 18
22
E. Outfall to the East Fork of the Trinity River
The gab ion mattress at the inlet structure showed some signs of minor damage. The wire
fabric of the mattress directly in front of the inlet has been torn.
Erosion is evident at the ends of the gabion mattress slope protection. The edges of the
mattress are becoming undermined.
The visible portions of the inlet structure appear to be in generally good condition. A
small sinkhole was noted over the pipe behind the inlet structure. It is not critical at this
point, but further monitoring is recommended.
The outfall structure shows signs of some minor damage, but continues to perform its
intended function. Minor cracking is evident in the headwall structure. Some erosion has
occurred at the bottom of the spillway as it enters the river, however no undermining of
the structure was observed.
Photograph 37
Gabion Mattress Apron and Inlet Structure at Sump 3A
23
Photograph 38
Gabion Mattress Apron and Inlet for Outfall Structure at Sump 3A
Photograph 39
Sinkhole behind Inlet for Outfall Structure at Sump 3A
24
Photograph 40
Erosion at Gabion Mattress Apron for Outfall Structure at Sump 3A
Photograph 41
Outfall Structure at the East Fork of the Trinity River
25
Photograph 42
Outfall Structure at the East Fork of the Trinity River
Photograph 43
Outfall Structure at the East Fork of the Trinity River
26
F. General Observations
Bunker sand was observed stockpiled in the Riverchase Golf Course Parking Lot without
any form of containment to prevent sand from washing into the storm drain system which
outfalls through a lateral into the box culvert under Riverchase Drive between Sumps 9
and 10. This same type of material was found inside the box culvert during the 2005
Sediment Removal Project. It is our understanding that Riverchase Golf Course has been
notified by the District that this practice should be suspended.
A previous problem with standing water in the TXU Right of Way adjacent to the
District's facilities had been reported. At the time of our observations, water levels in that
area were back to historical average levels and vegetation was re-established.
Vegetation along the banks of the Sumps did not appear to have been maintained for
sometime in many areas. While vegetation may have an adverse impact on the District's
structures, the vegetation may help to deter bank erosion that has been noted.
A hole and some low areas were noted between Sumps 2 and IA.
Photograph 44
Stockpiled Bunker Sand in the Riverchase Golf Course Parking Lot
27
Photograph 45
Vegetation and No Standing Water in TXU ROW
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Photograph 46
Vegetation and Typical Standing Water in TXU ROW behind Gabion Spillway 3
28
Photograph 47
Vegetation Typical along Banks of Sumps
Photograph 48
Hole in Swale between Sumps 2 and lA
29
Photograph 49
Low Area in Swale between Sumps 2 and lA
Photograph 50
Low Area in Swale between Sumps 2 and lA
30
v. RECOMMENDATIONS
In general, the District's facilities are in good condition. However both maintenance and monitoring
are advisable.
1. Glory Holes: Maintenance is needed to remove debris at glory hole openings at Sumps 2, 13 and
18 to ensure proper function of these structures.
2. Hole behind Gabion Spillway 5: Hole should be filled. Bunker sand will likely erode so a
more suitable material such as a clayey soil should be used to fill the hole. Grading should
be performed to level the ground and prevent water accumulation behind the wall. The District
may want to contact Riverchase Golf Course to perform these repairs as they maintain
these areas. .
3. Debris at Box Culvert Outfall in Sump 11: Debris should be removed.
4. Sloughing at Sumps: Surveying of top of bank in areas near the box culverts in all the affected
sumps was performed this year. Survey of the top of banks should be performed annually. The
survey performed this year wiI\ serve as a base line to determine the amount and impact of
sloughing on an annual basis.
5. Intake Structure for District Outfall to the Elm Fork: Monitoring is recommended for erosion
at the intake structure for the District outfall into the Elm Fork of the Trinity River. Undermining
of gabion mattress may require attention in the future. NDMCE can monitor the condition of the
gabion mattress at the outfall intake structure as a part of future annual reviews.
6. Bunker Sand Storage by Golf Course: The District may want to consider additional
correspondence with Riverchase Golf Course. Bunker sand stockpiled in the golf course parking
lot can wash into the storm drain system and into the box culvert under Riverchase Drive. Sand
was removed from the nearby box culvert as a part of the 2005 Sediment Removal construction
contract. While sand accumulation inside the box culvert may take a considerable amount of time
to create a significant blockage, some form of containment for the stockpiled bunker sand is
necessary to prevent a restriction in the box culvert from developing. It should be further noted
that the discharge into the storm sewer system may be a violation of storm water regulations.
7. Sump Bank Maintenance: The District may want to contact Riverchase Golf Course regarding
the maintenance of the banks of all sumps within the District in order to address erosion and
sloughing which wiI\ likely contribute to sedimentation of District facilities, however this does
not appear to have a great impact at this time. It is our understanding that the golf course is
responsible for the maintenance of the slopes and sump edges.
8. Sinkhole over City Box Culvert west of MacArthur: The District may want to notify the City
of Coppell as a courtesy regarding the sinkhole over the box culvert upstream of Sump 11. The
void is located west of the commercial development west of MacArthur Boulevard. This void has
been noted previously and has also been repaired previously by the City. No significant visible
difference in the void was visible in comparing photographs of the current condition against
photographs from a year ago.
9. Sinkhole behind Outfall Structure Intake at Sump 3A: Monitoring is recommended for
progression of the sinkhole. NDMCE can make observations of current conditions as a part of
future annual reviews.
10. Hole and low areas between Sumps 2 and lA: Hole and low areas should be filled. Bunker
sand will likely erode so a more suitable material such as a clayey soil should be used to
fill the hole. Investigation should be performed to ensure that no irrigation leaks are
contributing to the wet conditions. The District may want to contact Riverchase Golf
Course to perform these repairs as they maintain these areas.
31
APPENDIX A
FACILITY AND MAINTENANCE SUMMARY
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