Department: County Engineer
Department Head/Elected Official: Milton Rahman, PhD, P.E., PMP, CFM, ENV SP, County Engineer
Regular or Supplemental RCA: Regular RCA
Type of Request: Policy
Project ID (if applicable): N/A
Vendor/Entity Legal Name (if applicable): N/A
MWDBE Contracted Goal (if applicable): N/A
MWDBE Current Participation (if applicable): N/A
Justification for 0% MWDBE Participation Goal: N/A - Goal not applicable to request
Request Summary (Agenda Caption):
title
Request for approval of the Reaffirmation of Minimum Standards for Communities in Harris County and Draining to Harris County Facilities.
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Background and Discussion:
On Tuesday, May 19, 2020, Harris County Commissioners Court adopted minimum measures for adoption by communities located in Harris County to ensure the benefits achieved by the 2018 Harris County Flood Control District's Bond Program are protected. These five minimum measures, recommended by the Office of the County Engineer and Harris County Flood Control District include:
1. Use Atlas 14 rainfall rates for sizing storm water conveyance and detention systems.
2. Require a minimum detention rate of 0.55 acre-feet per acre of detention for any new development on tracts one acre or larger. A single-family residential structure and accessory building proposed on an existing lot is exempt from providing detention.
3. Prohibit the use of hydrograph timing as a substitute for detention on any project, unless it directly outfalls into Galveston Bay.
4. Require no net fill in the current mapped 500-year floodplain, except in areas identified as coastal zones only.
5. Require the minimum Finished Flood Elevation of new habitable structures be established at or waterproofed to the 500-year flood elevation as shown on the effective Flood Insurance Study.
The attached letter was sent to Mayors of cities located within Harris County and to all Counties that border Harris County. The letter includes guidelines for adopting f...
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