19-Attachment Z - Identify Need Statement.pdf

This is an Identify Need Statement prepared for the Harris County Flood Control District in Texas, documenting the project scope for professional architectural and/or engineering services related to the South Mayde Creek Bypass Channel and Stormwater Detention Basin. The project aims to reduce flooding along South Mayde Creek by lowering peak flows and water surface elevations, minimizing sedimentation and erosion, and improving hydraulic conveyance without creating adverse downstream impacts. The scope encompasses design, bidding, and construction phase services for two primary components: a bypass channel between Greenhouse and Barker Cypress Road, and sedimentation basins located upstream of Greenhouse Road. These improvements are part of Alternative 2, Scenario 2 from the 2020 Preliminary Engineering Report and represent the finalized recommended alternative for Lower South Mayde Creek improvements.

The project is anticipated to produce significant flood mitigation benefits, including average water surface elevation reductions of 0.9 to 2.3 feet for the 10% annual exceedance probability event and 0.8 to 2.3 feet for the 1% annual exceedance probability event between Fry and Greenhouse Road. The improvements are projected to remove 32 structures from the 10% annual exceedance probability event inundation and 1,203 structures from 1% annual exceedance probability event inundation. The statement does not specify contract pricing, funding sources, award dates, or contract term details, indicating that such information would be contained in the related request for services documentation.