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REQUEST FOR DRAINAGE & FLOODING COMMITEEAGENDA ITEM <br />Appropriation <br />Agenda Date Requested:July13, 2020 <br />Requested By:Lorenzo Wingate, P.E., C.F.M.Source of Funds: <br />Department:Public Works <br />Account Number: <br />Amount Budgeted: <br />ReportResolutionOrdinance <br />Amount Requested: <br />Exhibits:Harris CountyLetter; COLP Storm Sewer Design <br />Budgeted Item:YesNo <br />Criteria;La Porte FIRMs <br />SUMMARY <br />In a letter dated May12, 2020, the County Engineer for Harris County and the Executive <br />Director of Harris County Flood Control District(HCFCD)recommended minimum drainage <br />standards to the County Judge and Commissioners.The recommendation(s)presented by <br />county staffencouraged that all cities within Harris County adopt minimum drainage standards <br />The County Engineer <br />recommended drainage criteria are adopted by the community. <br />The potential changes are listed in the following table: <br />IğƩƩźƭ /ƚǒƓƷǤ wĻƨǒźƩĻƒĻƓƷ/ǒƩƩĻƓƷ /h\[t wĻƨǒźƩĻƒĻƓƷ <br />Atlas 14 rainfall rates to size storm water 5-year (ditches/culverts/stm swr); 25-year (100+ <br />conveyance and detension systemsacres); 100-year (bridges; creeks; detention) <br />0.55 ac-ft/ac detention rate0.45 ac-ft/ac detention rate <br />Prohibit detention design using hydrograph Detention design based on detention rate; <br />timing(consistinet with HC recommendation) <br />Fill allowed within 500-yr floodplain; no net fill <br />No net fill in the current 500-yr floodplain <br />within 100-year floodplain <br />Finished floor elevation established one foot <br />Finished floor elevation established at or <br />above and/or waterproofed to the 100-yr flood <br />waterproofed to the 500-yr flood elevation <br />elevation <br /> <br />