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a.) The developer shall provide a grading/drainage plan which shows that all building sites can <br />provide a finished floor elevation: <br /> <br />(1) At least one foot (1’) above the top of the curb using the highest point along the <br />portion of such curb fronting the building site, or <br />(2) At least one foot (1’) above the crown of the road elevation, using the highest point <br />along the portion of such road fronting the building site. <br />(3) At least one foot above the ground elevation along all sides of the building site. <br /> <br />b.) In addition to paragraph (a) above, the developer shall provide a grading/drainage plan which <br />meets or exceeds the provisions of Chapter 94, Code of Ordinances, Flood Hazard Reduction. <br />c.) The developer shall design and construct all streets to minimize any fill required to bring <br />building pads into compliance with this code. <br />d.) Alternate methods of building protection may be accepted by the City upon submittal of <br />detailed information, review and approval by the City Engineer. <br /> <br />5.6.5 Drainage System Criteria <br /> <br />If an underground drainage system is required, and a 60-inch or smaller pipe will handle the <br />design flow, pipe shall be used. If a 60-inch pipe is not adequate, the developer has the option to <br />use concrete pipe or natural and/or a lined open drainage channel. If pipe is selected, the <br />maximum allowable velocity shall be 8fps in the pipe. Lining materials, if used, shall be approved <br />by the City. <br /> <br />5.6.6 Public storm sewers are defined as sewers and appurtenances that provide drainage for a public <br /> right-of-way, or more than one private tract, and are located in public right-of-way or easement, <br /> private storm sewers provide internal drainage for a reserve or other tract. Private storm or sewer <br /> connections to public storm sewers shall occur at a manhole or at the back of an inlet as approved <br /> by the City Engineer. All private storm sewers within the public right-of-way shall be constructed <br /> in conformance with the Standards. <br /> <br />5.6.7 All construction shall conform with the City of La Porte Construction Details. <br /> <br />5.6.8 All storm sewers shall meet or exceed the requirements of the “Drainage Criteria Manual for <br /> Harris County, Texas” and the requirements of the City of La Porte. <br />5.6.9 All storm sewer shall be sized based on Atlas 14 rainfall data as described in Section 5.4. Any <br />new development proposed to discharge to a City of La Porte conveyance system (i.e. storm sewer <br />system, roadside ditch, etc.) will require detention at a minimum storage rate of 0.55 acre-ft/acre. <br /> <br />5.7 LOCATION OF STORM SEWER <br /> <br />5.7.1 Public storm sewers shall be located within a public street right-of-way or storm sewer easement, <br /> dedicated to the public and adjoining a public street right-of-way. Storm sewers through side lot <br /> drainage easements are highly discouraged. Limited use may be approved at the discretion of the <br /> City Engineer. If approved, a minimum twenty-foot (20’) wide easement is required (10’ on each <br /> lot). <br /> <br />5.7.2 Recommended alignment within a public street right-of-way. <br /> <br />A. Boulevard pavement section with median – along centerline of the right-of-way. <br />B. Undivided pavement section five feet (5’) inside the right-of-way. For storm sewer <br />located in a public street right-of-way, a minimum of two-foot (2’) shall be maintained <br />inside the right-of-way line to the outside edge of the storm sewer unless otherwise <br />accompanied by an adjacent easement. <br /> C. Alternate locations for a storm sewer will be permitted by the City Engineer. <br /> <br />Stormwater Criteria Page 7 of 10 <br /> <br />