Status Review - City of Coppell

Northwest Dallas CountyFlood Control District

Status ReviewNorthwest Dallas County

Flood Control District

The City of Coppell

Dallas County, Texas

Texas Reg. No. F-928

KHA Project # 064490013

Northwest Dallas County Flood Control District Re

Status Review

Table of Contents

Section Page

I. EXECUTIVE SUMMARY .................................................................................................. 2

II. SCOPE OF SERVICES ...................................................................................................... 2

III. LIMITATION ................................................................................................................... 2

IV. OBSERVATIONS ............................................................................................................. 2

A. Sumps ...................................................................................................................... 2

B. Box Culverts under Riverchase Drive .................................................................... 19

C. Glory Holes ............................................................................................................ 20

D. Spillways ................................................................................................................ 22

E. Outfall to the Elm Fork of the Trinity River ........................................................... 27

F. General Observations ........................................................................................... 30

V. RECOMMENDATIONS ................................................................................................. 31

Appendix A Facility and Maintenance Summary ......................................................... 33

Appendix B Site Map .................................................................................................... 38

Appendix C Projected Maintenance, Engineering, and NPDES/TPDES Costs .............. 40

Status Review

I. EXECUTIVE SUMMARY

Kimley-Horn and Associates, Inc. (Kimley-Horn) 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.

Kimley-Horn visually reviewed the status of all above ground facilities within the District

(intake structure, spillway structures, glory hole intakes, sump banks, swales, and outfall

structure). Visible storm drain outfalls along sump banks were also reviewed. Observation

of the performance of below grade structures was noted. However, the facilities below

grade (box culverts, headwalls, and storm drain piping between sumps) were not visually

reviewed for all sumps in this report because they are either submerged or buried and are

not accessible.

II. SCOPE OF SERVICES

Kimley-Horn is providing engineering services to the District. These services include:

1. Performing a site reconnaissance of the District’s structures and facilities.

2. Preparing 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 Kimley-Horn. 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 Kimley-Horn's observations performed

on October 19th, 2021 and November 22nd, 2021. Refer to Appendix B “Site Map” for

locations of photographs and facilities described.

A. Sumps

Sumps with significant sediment accumulations have been identified. Sediment was

removed from Sump 11 in 2005. Sediment was removed from Sumps 9 and 10 in 2006.

Work to remove sediment from Sumps 2 and 14 was completed in 2007. During

Status Review

observations on October 19, 2021, sediment was being hydraulically dredged from Sump 13

and transferred into Sump 1A. The dredging was complete before the observations

performed on November 22, 2021.

In 2019, Riverchase Golf Course addressed erosion occurring at the storm drain outfall

headwall located along Sump 10. In-situ material was excavated around the existing

headwall and backfilled with clay-like material. Slopes adjacent to the outfall headwall

were armored with riprap rock.

Sloughing along the banks of sumps was evident at headwalls out falling into a number

of the sumps as well as at the intake structure in Sump 3A. Sloughing was mostly

observed in Sumps 1A, 2A, and 3A. Erosion has encroached on cart paths near Sumps 11

and 2A. Erosion behind headwalls was mostly observed at Sumps 1A, 2, 2A, 3A, and 14.

Stormwater levels were very high in 2007. Minor slope failures were noted along the

banks of Sump 3A in the 2007 report. Stormwater levels were very high in the spring

and summer of 2015, in the late fall of 2015 through early 2016, and again for multiple

months in 2018. During observations in October 2021 and November 2021, additional

signs of continued sloughing were observed.

Storm drain outfalls into the sumps were observed. Visual observation was performed

where outfalls were found and were accessible at the time of the review. Some storm

drain outfalls shown on record drawings were not found in the field. Erosion around

storm drain headwalls was observed. Minor sediment accumulation was noted in some

areas. Spalling of concrete on the headwall for outfall 8-A in Sump 8 was observed.

Aquatic vegetation was observed, but levels have diminished from levels observed

earlier in the year. Sump 8 and Sump 11 have significant aquatic vegetation and algae

present.

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Photograph 1

Sloughing along South Bank of Sump 1A

Photograph 2

Erosion behind Storm Drain Outfall 1A-A Headwall of Sump 1A

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Photograph 3

Erosion along North Bank of Sump 1A

Photograph 4

Dredging Discharge into Sump 1A (from Sump 13)

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Photograph 5

Sloughing and Erosion at Cart Path Along Southeast Bank of Sump 2A

Photograph 6

Sloughing Along West Bank of Sump 2A

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Photograph 7

Erosion Along Southeast Corner of Sump 2A

Photograph 8

Sloughing and Aquatic Vegetation along North East Bank of Sump 2A

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Photograph 9

Outfall 2A-A Headwall at Sump 2A

Photograph 10

Sloughing Along South Bank of Sump 3A

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Photograph 11

Sloughing along West Bank of Sump 3A

Photograph 12

Algae Observed at Sump 8

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Photograph 13

Concrete Spalling on Storm Drain Outfall 8-A Headwall on Bank of Sump 8

Photograph 14

Erosion along West Bank of Sump 9

Status Review

Photograph 15

Sloughing and Aquatic Vegetation on Banks of Sump 9

Photograph 16

Overview of Sump 10

Status Review

Photograph 18

Storm Drain Outfall Headwall on and Bank and Aquatic Vegetation of Sump 11

Photograph 17

Aquatic Vegetation at Sump 11

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Photograph 19

Sump 11 Overview

Photograph 20

Aquatic Vegetation/Algea in Sump 13

Status Review

Photograph 21

Aquatic Vegetation/Algae and Dredging Activities in Sump 13

Photograph 22

Storm Drain Outfall Headwall on Bank and Aquatic Vegetation in Sump 14

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Photograph 23

Storm Drain Outfall Headwall on Bank of Sump 14

Photograph 24

Box Culvert Headwall and Algae at Sump 14

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Photograph 25

Algae at Sump 2

Photograph 26

Storm Drain Outfall and Aquatic Vegetation at Southwest Corner of Sump 2

Status Review

Photograph 27

Erosion Behind Outfall 2-B at Sump 2

Photograph 28

Erosion Behind Headwall of Outfall 2-A at Sump 2

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Photograph 29

Overview of Sump 18

Photograph 30

Outfall Headwall at Sump 18

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Photograph 31

Sloughing and Erosion at Sump 18

B. Box Culverts under Riverchase Drive

Sediment accumulation was removed from the 5-8’×4’ box culverts (Line A, between

Sumps 2 and 14) and the 4-8’×4’ box culverts (Line B, between Sumps 9 and 10) in 2005

and 2006 and again in 2019. A storm sewer lateral connection protruding into the box

culvert was discovered and adjusted to be flush with the box culvert wall. In addition, an

area extending 10 linear feet beyond each box culvert headwall was also cleaned and

sediment removed.

Status Review

Photograph 32

Box Culvert Headwall at Sump 14

C. Glory Holes

Visible portions of Glory Holes appear to be in generally good condition. The Glory Hole

at Sump 13 appears to have a damaged grate and is significantly overgrown. The Glory

Hole at Sump 18 is in generally good condition.

Status Review

Photograph 33

Glory Hole at Sump 2

Photograph 34

Glory Hole at Sump 13 (Dislocated and Damaged Grate; Obscured by Vegetation and Debris)

Status Review

Photograph 35

Glory Hole at Sump 18

D. Spillways

All spillway structures were replaced in 2002 and 2004. No significant concerns were

noted during this observation and the structures appear to be in good condition. There

appears to be less vegetation surrounding the pipes and spillway in Gabion Spillway 2

and 4 than observed in the previous status review from November 11, 2020. Vegetation

was noted growing in close proximity to Spillway 3. Erosion was noted behind gabion

Spillway 6 and it appears to be larger than observed in previous review. Minor cracking

was observed in the concrete caps on all of the Spillways. All cracking appears to be larger

than previously observed. At Gabion Spillway 6, there was spalling observed on the

concrete cap.

In 2019, Riverchase Golf Course addressed erosion occurring at Gabion Spillway 4 at

Sump 3A and Gabion Spillway 5 at Sump 10. In-situ material was excavated 2-ft behind

the spillway. Filter fabric was installed and backfilled with clay-like material. Slopes

adjacent to the spillway were armored with riprap rock.

Status Review

Photograph 36

Gabion Spillway 1 at Sump 1A

Photograph 37

Crack in Concrete Cap on Gabion Spillway 1 at Sump 1A

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Photograph 38

Gabion Spillway 2 at Sump 14

Photograph 39

Gabion Spillway 3 at Sump 13 (Vegetation Growing on Gabions)

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Photograph 40

Gabion Spillway 4 at Sump 3A

Photograph 41

Crack in Concrete Cap on Gabion Spillway 4 at Sump 3A

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Photograph 43

Erosion Behind Gabion Spillway 6 at Sump 18 (Vegetation Growing on Gabions)

Photograph 42

Gabion Spillway 5 at Sump 10

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Photograph 44

Spalling on Concrete Cap for Gabion Spillway 6 at Sump 18

E. Outfall to the Elm Fork of the Trinity River

The outfall structure showed signs of some minor damage but continues to perform its

intended function. Minor cracking is evident in the headwall structure. Cracking was

noted in the outfall structure in previous reviews. Some erosion was previously

observed at the bottom of the spillway as it enters the river.

The damaged gabion mattress at the inlet structure was replaced as a part of the 2010

Miscellaneous Repairs project. Areas of erosion were also repaired at that time. Erosion

appears to be bigger behind inlet structure at Sump 3A compared to the last

observation on November 11, 2020.

Status Review

Photograph 45

Gabion Mattress Apron and Inlet Structure at Sump 3A

Photograph 46

Erosion Behind Inlet Structure at Sump 3A

Status Review

Photograph 47

Outfall Structure at the Elm Fork of the Trinity River

Photograph 48

Outfall Structure at the Elm Fork of the Trinity River

Status Review

F. General Observations

A previous problem with standing water in the TXU Right of Way adjacent to the

District’s facilities has been reported. This area is within the District boundary but is not

owned by the District. It is our understanding that the Riverchase Owners Association,

Oncor, and the City are ultimately responsible for maintenance of this area. The City has

proposed a trail project that will include improvements to the affected property. Kimley-

Horn is not aware of the status of this project.

As noted in previous reviews, sump bank erosion has been observed in multiple areas.

However, maintenance of the sump banks is not the District’s responsibility based on

our understanding of the original Declaration of Easements & Agreements document

recorded in Dallas County on July 29, 1987. Riverchase Golf Course personnel have

made efforts to address erosion maintenance at three District structures.

The intake to the box culverts crossing under MacArthur Boulevard and discharging into

Sump 11 is owned and maintained by the City of Coppell. Minor vegetation growth and

sedimentation was observed at the intake, but overall, the box culverts at MacArthur

Boulevard were in good condition.

Photograph 49

Box Culvert Under MacArthur Boulevard

Status Review

V. RECOMMENDATIONS

In general, the District's facilities are in good condition. However, both maintenance and

monitoring are advisable.

1. Sump Bank Maintenance: The 1987 Declaration of Easements & Agreements states in

Exhibit 7 that the golf course is responsible for the maintenance of the banks of lakes.

The “lakes” are referenced as sumps in this document. Riverchase Golf Course has

begun a maintenance program to address the sump bank maintenance needs.

Continued coordination regarding their maintenance program is advised.

2. Erosion behind Gabion Spillway 6: Eroded areas need to be filled and stabilized. It is our

understanding that the golf course is responsible for maintenance of the swales.

3. Glory Holes: Glory holes should be cleaned, grates repaired or replaced and maintained.

It is our understanding that the golf course is responsible for cleaning of the glory holes.

Future maintenance projects should consider replacing the glory hole grate at sump 13.

4. Aquatic Vegetation: Aquatic vegetation on Sumps 2, 8, 9, 11, 13, and 14 should be

addressed. Aquatic vegetation on Sumps 1A, 2A, 3A, 10, and 18 should be monitored.

5. Vegetation on Gabion Spillway Structures: Vegetation growing on spillway structures 2,

3 and 5 at Sumps 13, 14 and 18 should be addressed.

6. Cracking in Spillway Concrete Caps: Cracking should be monitored.

7. Spalling on Spillway Concrete Caps: Spalling should be monitored. Coordination with

Riverchase Golf Course regarding mowing around spillway concrete caps to prevent

future spalling is advised.

8. Outfall to the Elm Fork of the Trinity River: Eroded areas around the intake structure

and gabion mattress should be monitored.

9. Storm Drain Outfalls: As noted above, sump bank maintenance impacts the long-term

stability of storm drain outfalls. Sump bank erosion is impacting multiple headwalls.

Sump 1A, 2, 2A, 3A, and 14 headwalls that have significant erosion should be addressed.

There has been very little change in the condition of most of the storm drain outfalls

over the past several years. It is difficult to determine if and when the storm drain

outfalls will become unstable or fail, but if sump bank erosion continues, storm drain

outfalls will require attention at some point. Storm drain outfalls should be monitored.

At this time, no significant concerns have been observed related to visible storm drain

outfalls other than erosion of the sump banks around the headwalls. If sump bank

erosion leads to storm drain outfall damage, it is our understanding that Riverchase Golf

Course would be responsible for costs associated with those outfall repairs.

10. Box Culvert Under MacArthur Boulevard: Vegetation growth and sediment

accumulation at the box culvert intake should be monitored. If conditions worsen, the

City of Coppell should be notified of the maintenance need.

11. Sediment Accumulation Mitigation in Sumps: Current sediment levels in Sumps 2,8,9,

and 13 have been identified for removal. During observations, sediment was being

Status Review

transferred from Sump 13 to Sump 1A. A program to perform sediment removal has

been initiated.

12. Spalling on Outfall Headwall: Spalling on headwall should be monitored. Coordination

with Riverchase Golf Course regarding mowing around outfall headwalls to prevent

future spalling is advised.

13. Erosion Encroaching on Cart Paths: Erosion encroaching on cart paths should be

brought to the attention of Riverchase Golf Course so they can take any necessary

action they deem appropriate to address the issue.

Status Review

APPENDIX A

FACILITY AND MAINTENANCE SUMMARY

Northwest Dallas County Flood Control DistrictFacility Maintenance Inspection Summary

December 2021

Sump 2021 Comments Recommendations Activity Action Taken

1A Sloughing noted.Monitor progress of bank erosion. Monitor aquatic vegeation and algae.

Sediment accumulation noted in 2020 Sediment Report.

2 Sloughing noted. Aquatic vegetation/Algea noted.

Monitor progress of bank erosion. Coordinate removal of aquatic vegeation and algae.

Sediment accumulation noted in 2004 Annual Review and 2020 Sediment Report. Sediment removed in 2007.

2A Sloughing noted. Monitor progress of bank erosionSediment accumulation noted in 2020 Sediment Report.

3A Sloughing noted. Monitor progress of bank erosionSediment accumulation noted in 2020 Sediment Report.

8 Sloughing noted. Aquatic vegetation/Algea noted.Monitor progress of bank erosion. Monitor aquatic vegeation and algae.

10 Sloughing noted. Monitor progress of bank erosionSediment accumulation noted in 2020 Sediment Report.

Sediment accumulation noted in 2004 Annual Review and 2020 Sdiment Report. Debris noted at outfall in 2009.

Sediment removed in 2007. Debris removed in 2011.

Sediment accumulation noted in 2020 Sediment Report. Sediment removed in 2021.

Sediment accumulation noted in 2004 Annual Review. Sediment removed in 2007.

Box Culvert Recommendations Activity Action Taken

Riverchase North (5-8'x4')

Significant sediment previously noted. (30" maximum sediment observed) 48" pipe protruding into culvert. None.

Sediment accumulation noted in 2004 Annual Review. Sediment removed in 2006 and 2019.

Riverchase South (4-8'x4') Significant sediment previously noted. (30" maximum sediment observed) None.

Sediment accumulation noted in 2004 Annual Review. Sediment removed in 2006 and 2019.

MacArthur Blvd (2-7'x4') Minor sediment noted and debris noted. None.

Sediment accumulation noted in 2004 Annual Review.

Sediment removed in 2006 and 2019..

Glory Hole Recommendations Activity Action Taken

Sump 2 Minor debris collected on grate. Monitor debris on grate.

Addition of grate recommended in 2003 Annual Review. Grate cleaning recommended in 2009, 2015 and 2018.

Grate installed in 2004. Grate cleaning addressed in 2011. Grate cleaning addressed in 2016.Grate cleaning addressed in 2021.

1/7/2022

December 2021

Sump 13 Debris collected on grate.Dislocated and damaged grate. Replacement of grate.

Grate installed in 2004. Grate cleaning addressed in 2011. Grate cleaning addressed in 2016.Grate cleaning addressed in 2021.

Sump 18 Minor debris collected on grate. Monitor debris on grate.

Grate installed in 2004. Grate cleaning addressed in 2011. Grate cleaning addressed in 2016.

Spillway Recommendations Activity Action Taken

1 Minor cracking noted. Monitor cracking Damage noted in 2003 Annual Review. Structure replaced in 2004.

2 Minor cracking noted. Vegetation growing near face of structure. Monitor cracking; Monitor vegetation Damage noted in 2003 Annual Review. Structure replaced in 2004.

3 Minor cracking noted. Vegetation growing near face of structure. Monitor cracking; Monitor vegetation Damage noted in 2001 Annual Review. Structure replaced in 2002.

4 Minor cracking noted. Monitor cracking Damage noted in 2003 Annual Review. Structure replaced in 2004.

5 Minor cracking noted. Vegetation growing near face of structure. Monitor cracking; Monitor vegetation Damage noted in 2001 Annual Review.

Structure replaced in 2002. Hole filled and grading performed by Riverchase Golf in 2010.

Erosion noted behind structure. Minor cracking noted. Vegetation growing near face of structure. Minor spall noted.

Monitor cracking; Monitor vegetation; Monitor spalling: Coordinate filling and stabilizing of erosion. Damage noted in 2001 Annual Review. Structure replaced in 2002.

1/7/2022

December 2021

Outfall to the East Fork of the Trinity River Recommendations Activity Action Taken

Intake Erosion noted. Address erosion.Gabion deterioration and erosion noted in 2009 review.

Gabion and erosion repairs addressed in 2011.

Outfall Minor cracking at headwall/minor erosion. Debris piled in area of outfall.Monitor condition of outfall. Coordinate removal of debris. None.

Storm Sewer Outfalls to Sumps1,2,3

Recommendations Activity Action Taken

1A-A Apparent erosion at flowline. Continued visual observation. N/A N/A

2-A Apparent erosion at flowline. Visible erosion around headwall. Continued visual observation. N/A N/A

2-B Visible erosion around headwall. Continued visual observation. N/A N/A

2A-A Visible erosion around headwall. Continued visual observation. N/A N/A

2A-B Visible erosion around headwall. Continued visual observation. N/A N/A

8-A Minor erosion visible around headwall. Minor spall on headwall. Continued visual observation. N/A N/A

10-A Erosion addressed by Riverchase Golf. None. N/A N/A

10-B Not Found. N/A N/A

11-AMinor sediment accumulation at flowline. Visible erosion around headwall. Continued visual observation. N/A N/A

11-BMinor sediment accumulation at flowline. Visible erosion around headwall. Continued visual observation. N/A N/A

11-CMinor sediment accumulation at flowline. Visible erosion around headwall. Continued visual observation. N/A N/A

11-D Not Found. N/A N/A

11-E Not Found. N/A N/A

13-A Minor sediment accumulation at flowline. Continued visual observation. N/A N/A

13-B Apparent erosion at flowline. Continued visual observation. N/A N/A

13-C Minor sediment accumulation at flowline. Continued visual observation. N/A N/A

13-D Not Found. N/A N/A

14-A Visible erosion around headwall. Continued visual observation. N/A N/A

14-B Apparent erosion at flowline. Visible erosion around headwall. Continued visual observation. N/A N/A

14-C Apparent erosion at flowline. Visible erosion around headwall. Continued visual observation. N/A N/A

18-A Apparent erosion at flowline. Visible erosion around headwall. Continued visual observation. N/A N/A

18-B Not Found. N/A N/A

Notes:

1. Not all headwalls visible or accessible at time of observations.

2. Listing includes all storm sewer outfalls identified from record drawing investigations. Not all storm sewer outfalls were found in the field. Storm sewer outfall sediment observations were performed in 2013.

3. Erosion is associated with sump bank maintenance. It is our understanding that sump bank maintenance is not a District responsibility.

1/7/2022

Northwest Dallas County Flood Control District

Maintenance Summary*

December 2021

Year Project Annual Status Review Construction Cost

2002* 2002 Gabion Spillway Repairs Replaced Spillway Structures 3, 5, and 6 $76,100.00

2003 No Maintenance Projects $0.00

2004 2003 Drainage Structure Repairs

Replaced Spillway Structures 1, 2, and 4 and added grates to glory holes at Sumps 2, 13, and 18 $138,400.00

2005 2004 Sump 11 Sediment Removal Project Removed sediment from Sump 11 and cleaned box culvert under MacArthur Blvd.** $224,104.002006 2005 Sediment Removal Project**** Removed sediment from Sumps 9 and 10 and cleaned box culverts under Riverchase Dr. *** $197,407.40

2007 2005 Sediment Removal Project**** Removed sediment form Sumps 2 and 14 $91,876.50

2010 2010 Miscellaneous Repairs Project Initiated

Removed debris in Sump 11; cleaned grates at Glory Holes in Sumps 2, 13, and 18; repaired gabions and erosion at Intake to Outfall to the East Fork of the Trinity River $0.00

2011 2010 Miscellaneous Repairs Project Completed $172,392.00

2019 Miscellaneous Repairs Project Completed

Riverchase Golf backfilled around existing headwall of Sump 10 and armored slopes with riprap; Riverchase Golf backfilled behind spillway at Sump 10 and armored slopes with riprap; Riverchase Golf backfilled behind spillway at Sump 3A and armored slopes with riprap. Sediment was removed from box culverts crossing Riverchase Drive at two locations. $48,993.00+

2021 Sump 13 Sediment Removal Completed

Removed sediment from Sump 13 and transferred to Sump 1A. Cleaned existing glory hole grates at Sump 2 and Sump 13. $48,900.00

Total $949,179.90

* Kimley-Horn does not have records regarding any maintenance projects prior to 2002.

** City of Coppell contributed $17,964.00 for box culvert cleaning.

*** City of Coppell contributed $82,692.90 for box culvert cleaning.

**** Split construction contract into two areas of work.

1/7/2022

Status Review

APPENDIX B

SITE MAP

Status Review

APPENDIX C

PROJECTED MAINTENANCE, ENGINEERING,

AND NPDES/TPDES COSTS

Northwest Dallas County Flood Control District

5 Year Maintenance Schedule

2021-2026

(October through September)

Fiscal Year Recommended Maintenance Projected Construction Cost Projected Engineering Fees Combined Total 2021-2022 $0 $27,300

Miscellaneous Repairs/Sediment

Removal

$65,000 $20,000

Golf Course Coordination $0 $5,000

$100 $2,575

Totals $65,100 $54,875 Combined Total $119,975

2022-2023 Annual Status Review $0 $28,665

Removal

$65,000 $20,000

NPDES/TPDES Requirements $100 $2,704

Removal

$65,000 $20,000

TCEQ SWMP Updates $0 $18,000

Removal

$65,000 $20,000

Removal

$65,000 $20,000

5 Year Projected Costs $325,900 $345,789 $671,689

Annual Status Review

NPDES/TPDES Requirements

Note: These costs represent conceptual information only and are subject to change. The information listed above includes Northwest Dallas County Flood Control District anticipated potential costs only. Any costs

associated with sump bank maintenance are the responsibility of Riverchase Golf Course and are not included.

1/7/2022

2201 West Royal Lane, Suite 275, Irving, TX 75063

PHONE: 214.420.5600 | www.kimley-horn.com

Texas Reg. No. F-928

Status Review - City of Coppell

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