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<br />For larger developments every consideration shall be given to designing of the facility for multipurpose <br />use. such as playgrounds, ballfields, miniparks. required green spaces, etc. to assure that maintenance will <br />be accomplished. The design shall include the following: <br /> <br />1. an earthen detention basin shall have minimum side slopes of 4: 1 and a minimum bottom width <br />of ten feet; <br />2. the bottom ofthe detention basin shall have a minimum 0.50% cross slope to facilitate quick <br />drainage. <br />3. a v-shaped trickle channel a minimum of 5' wide, six-inch thick, reinforced concrete shall be <br />constructed through tile detention basin at a longitudinal slope of 0.20% to accommodate low flow <br />and facilitate rapid drainage. For developments less than 3 acres, the trickle channellnay be 2 feet <br />wide and 4" thick. <br />4. a minimum 12-foot wide maintenance berm shall be provided around the perimeter of the <br />detention facility. <br />5. ingress and egress for maintenance including a dedicated right-of-way if required, shall be <br />provided to tile detention basin and clearly shown on the construction drawings or site plan <br />subdivision plat. <br />6. ilie detention basins, slopes, bottom. maintenance berm, and oilier associated right-of-way shall <br />be final graded with a minimum of 6" top soil then hydro-mulch or drill-seeded and watered to <br />facilitate full grass coverage. <br />7. parties responsible for maintenance of the detention facility must be shown on the plat and or <br />plans. <br />8. Pumped detention systems may be allowed with specific approval from the City Engineer. <br /> <br />5.5.4 Ownership and Maintenance of Facilities <br /> <br />The City will not accept maintenance of on site facilities that serve only one tract or development, unless it <br />is determined to have other public benefits. is recommended by staff and approved by the Planning and <br />Zoning Commission. <br /> <br />Harris County Flood Control District may, at their discretion, accept maintenance of facilities, provided <br />they are designed in accordance with the District's criteria manual. Requests for Harris County Flood <br />Control District to assume maintenance of any facility should be coordinated 'l-vith the City prior to any <br />development approvals. <br /> <br />5.5.5 Plat Review of Facilities <br /> <br />TIle mtes of detention applicable to any development approved and authorized for construction shall be <br />subject to the detention mte applicable to the size tract ofland as configured on February 23,2009. As part <br />of the plat review process, the Planning Department shall utilize the configuration as shown in the Harris <br />County Apprdisal District maps dated, printed and kept on file as of ilie same date described herein. Any <br />subdivision of land thereafter, wheilier or not by recorded plat, shall be subject to ilie detention mte as <br />specified for ilie previously undivided tract <br /> <br />5.6 ADDITIONAL DESIGN REQUIREMENTS <br /> <br />5.6.1 Discharge Points <br /> <br />The developer shall terminate all drainage improvements at a discharge point approved by the City. TIle <br />developer shall design and construct such discharge point, or outlet, to prevent damage to or overflo",ing <br />into adjacent property. The City may require creek improvement, channel lining, energy dissipaters or <br />other improvements for such outlet to prevent erosion or increase the flow eapacity. All piped outfalls into <br />a rt."Ceiving stream shall be at a 450 to the stream if pipe diameter is less than 42-inches and 300 to the <br />stream is pipe is greater than 42-inches. <br /> <br />Stol1llwatcr Criteria Page 6 of 10 <br />