Drainage_and_Flooding_Report-dated_10_03_2008

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Mr. Ron Bottoms, City Manager October 1, 2008 Page 3 of 31 19NININ0131402.1 fig k I o t z associates ! 1! 13 1 11111rivirmll iliiirimlt mi� miretrill 1� 101111MIJ habitable structure must provide a limshed tloor slab which is at least 1) 12 inches ,• the top •i curb at its highest •• along the • the curb • the building site; 2) 18 inches above the crown of the road elevation along the road • the building site; and 3) 12 inches .•• the ground • • all sides of the building site. Provision is provided for alternative methods of protection with approval of the City Engineer. A review of the design criteria for the City of La Porte and surrounding areas, including Harris County, Pearland, Galveston County, Chambers County, and Brazoria, County, found a mixture of municipal • water or • sewer design criteria. Both the City of Houston and the City of La Porte have standardized stonn sewer design requirements. The nearby cities of Deer Park and Baytown do not have specific standards that are to be used by the public or engineering • for storm water • Other cities in the region, such as Sugar Land, Pearland, Friendswood, and Missouri City, have • sewer design requirements. Some cities, such as Mont Belvieu, utilize county standards as surrogates for city -adopted standards. HCFCD has design guidelines available on its website. RUNNFNFITIVW��, �� Chapter •4 • the City's Code of Ordinances addresses flood hazard and potential construction in •- flood hazard areas. Standards applicable to new construction or substantial improvements in special flood hazard zones require a variety of measures for sound construction of structures and installation of utilities to eliminate or reduce damages from floods. These standards also include the following requirements: • Lowest floor elevation • new residential structures must •- I -foot •r 01 •. flood (100-year) elevation • Lowest floor elevation • new non-residential structures must • at or abo the base flood elevation (or equivalent structure protection must be provided] Special requirements also apply for manufactured homes to prevent floatation, collapse, or lateral movement. These .r• requirements for construction in •` flood hazard areas are consistent with many communities in the Houston •#• area.