STRATEGIC PRIORITY: Sustainable
AGENDA DATE: June 25, 2025
COUNCIL DISTRICT(S): 13
DEPARTMENT: Dallas Water Utilities Department
EXECUTIVE: Dev Rastogi
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SUBJECT
Title
Authorize a professional services contract with Halff Associates, Inc. to provide engineering services required for drainage relief improvements to the designated Comprehensive Storm Drainage System Assessment Area 31 - Echo Glen - Not to exceed $1,118,600.00 - Financing: Storm Drainage Management Capital Construction Fund
Body
BACKGROUND
On June 24, 2020, the City Council authorized a professional services contract to complete a Comprehensive Storm Drainage System Assessment (CSDSA) for the City of Dallas. The assessment's objectives included identifying flood-prone areas and recommending high-priority projects. Forty-seven areas were selected for detailed modeling and alternative analysis. The CSDSA initiative involved extensive collaboration with Dallas Water Utilities Department (DWU) personnel, field reconnaissance, hydrologic and hydraulic assessments, flood mapping, and the conceptual development of alternatives to mitigate the risk of flood-related damages.
Located at the headwaters of the Joe's Creek Watershed, Project Area 31 - Echo Glen stretches from Interstate Highway 635 (IH-635) to the north and Forest Lane to the south between Welch Road and Haydale Drive. The existing storm sewer system was installed before the current design standards were in place and is inadequately sized. Ninety structures are at risk of flooding by the 100-year storm event with many affected structures categorized as single-family homes. The total inundated area is over eighty acres with depths up to 3.1 feet. Based on the detailed hydraulic model, the existing system has the capacity for less than a two-year storm event.
Project Area 31 was selected by DWU as one of the ten areas to be further developed into a detailed recommendation ...
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