Primary Department: Purchasing
Primary Department Head/Elected Official: Kimberly J. Williams, JD
Secondary Department: Flood Control District
Secondary Department Head/Elected Official: Marcus Stuckett
Regular or Supplemental RCA: Regular RCA
Type of Request: Transmittal
Project ID (if applicable): 260086
Vendor/Entity Legal Name (if applicable): DNT Construction, LLC
MWBE Contracted Goal (if applicable): 18.40%
MWBE Current Participation (if applicable):
Justification for 0% MWBE Participation Goal: N/A - Goal is not 0% and is listed above
Grant Indirect Costs Rate (if applicable):
Justification for 0% Grant Indirect Costs Rate (if applicable): Choose an item.
Request Summary (Agenda Caption):
title
Transmittal by the Office of the Purchasing Agent of an award of a Community Development Block Grant Disaster Recovery (CDBG-DR)/Community Development Block Grant Mitigation (CDBG-MIT) Program(s) project on the basis of lowest priced proposal meeting requirements to DNT Construction, LLC in the amount of $9,770,000 for Isom Stormwater Detention Basin for the Flood Control District, and for the County Clerk to execute any applicable bonds to be received (260086), MWBE Contracted Goal: 18.40%.
end
Background and Discussion:
The Isom Stormwater Detention Basin project consists of construction of a regional dry-bottom stormwater detention basin that combines and expands existing Harris County Flood Control District (HCFCD) and Texas Department of Transportation (TxDOT) detention facilities (SWDB Units P518-11-00 and P518-07-00) within existing HCFCD and TxDOT rights-of-way. Work includes excavation and grading to reconfigure and hydraulically connect the existing basins to provide approximately 334.6 acre-feet of additional detention storage; modification of an existing spillway; construction of backslope swales, interceptor structures, outfalls, concrete pilot channels, and a stormwater quality weir; and implementation of environmental mitigation, erosion control, and SWPPP measures in accordance with applicable regulatory and FAA hazard-avoidance requirements due to proximity to George Bush Intercontinental Airport (IAH). Additional work includes vegetation establishment, access control features, traffic control, groundwater management as required, and debris removal. Upon completion, the improvements will increase total detention capacity to approximately 576.8 acre-feet and will reduce water surface elevations along Halls Bayou while maintaining functionality of the existing detention facilities.
The Isom Stormwater Detention Basin project is part of the Harris County Flood Control District’s regional flood damage reduction program within the Halls Bayou watershed. The project will improve and expand existing detention facilities to address identified capacity deficiencies and to support current watershed hydrologic and hydraulic criteria. The improvements will enhance regional drainage performance while maintaining functionality of the existing flood control infrastructure.
Expected Impact:
The Isom SWDB originally conceived to hold between 572 and 610 acre-feet of stormwater during a 500-year pre-Atlas 14 storm event. After updating the SWDB concept to a dry-bottom configuration in the expansion area, the total detention volume for the Isom SWDB is estimated to be 576.8 acre-feet, increasing the detention volume of the existing basins by 334.6 acre-feet.
While the additional detention volume is intended to mitigate future channel improvements to Halls Bayou, the Isom SWDB alone provides interim benefits and reduces flood risks to 79 structures during the 0.2% (500-year) Pre-Atlas 14 storm event, with corresponding benefit to 253 persons.
Alternative Options:
The alternative to approving this item would be not to approve the construction services, which would not provide additional flood risk reduction and increased stormwater capacity.
County Strategic Plan Goal: 5. Minimize the impact of climate change and disasters.
County Strategic Plan Objective: H: Improve the condition and resilience of County transportation, flood control, and other infrastructure.
Justice/Safety Initiative (Goal 1): N/A
Infrastructure Initiative (Goal 2): H1: Complete and implement the Flood Resilience Plan.
Economy Initiative (Goal 3): N/A
Health Initiative (Goal 4): N/A
Climate/Resilience Initiative (Goal 5): N/A
Housing Initiative (Goal 6): N/A
Additional notes related to the Strategic Plan:
Prior Court Action (if any):
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Date |
Agenda Item # |
Action Taken |
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4/16/2026 |
279 |
Approval to Advertise |
Location:
Address (if applicable): 0 Aldine Westfield Road, Houston, TX 77039
Precinct(s): Precinct 2
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Fiscal and Personnel Summary |
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Construction Services |
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Existing Budget |
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Grant |
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$9,770,000.00 |
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Total Existing Budget |
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$9,770,000.00 |
$9,770,000.00 |
$0.00 |
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Additional Budget Request (Requires Fiscal Review Request Form) |
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Total Additional Budget Request |
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Total Funding Sources |
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$9,770,000.00 |
$9,770,000.00 |
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Grants - Proposed Budget (For Grants Items only) |
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Grant Funds Applied for/Awarded (Total) |
$9,770,000.00 |
$0.00 |
$9,770,000.00 |
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Personnel (Fill out section only if requesting new Position Control Numbers (PCN)s) |
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Current Position Count for Service |
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Additional Positions Request |
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Total Personnel |
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County Attorney’s Office Legal Review (for Harris County Code Items only) |
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CAO Reviewer Name and Title |
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Anticipated Court Date: 8/6/2026
Anticipated Implementation Date (if different from Court date): 6/18/2026
Emergency/Disaster Recovery Note: Not an emergency, disaster, or ARPA related item
Contact(s) name, title, department: Casey Goforth, CDBG Project Manager - Staff Augmentation, Flood Control District; Matthew McGarrity, Sourcing Manager, Purchasing
Attachments (if applicable): Letter, Memo