R-1999-31 - Laserfiche WebLink

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e e 6. the detention basin, slopes, bottom, maintenance benn, and other associated right-of-way shall be final graded with a minimum of 6" top soil then hydro-mulch seeded or drill-seeded and watered to facilitate full grass coverage. 7. parties responsible for maintenance of the detention facility must be shown on the plat and or plans. 8. Pumped detention systems may be allowed with specific approval from the City Engineer. 5.5.4 Ownership and Maintenance of Facilities The City will not accept maintenance of on site facilities that serve only one tract or development, unless it is determined to have other public benefits, is recommended by staff and approved by the Planning and Zoning Commission. Harris County Flood Control District may, at their discretion, accept maintenance of facilities, provided they are designed in accordance with the District's criteria manual. Requests for Harris County Flood Control District to assume maintenance of any facility should be coordinated with the City prior to any development approvals. 5.6 ADDITIONAL DESIGN REQUIRMENTS 5.6.1 Discharge Points The developer shall terminate all drainage improvements at a discharge point approved by the City. The developer shall design and construct such discharge point, or outlet, to prevent damage to or overflowing into adjacent property. The City may require creek improvement, channel lining, energy dissipaters or other improvements for such outlet to prevent erosion or increase the flow capacity. Finished elevations of new pavement, parking areas, or other improvements shall be designed so that each succeeding high point is lower when moving in a downstream direction. This ensures the 100- year discharge has an unobstructed path to the discharge point whether discharging to a channel or detention pond. 5.6.2 Public Streets as Drainage Facilities 1. Maximum depth of water to be allowed in local streets during design flow shall be at the top of crown, or top of curb, whichever is least. 2. Maximum spread of water in collector streets during design flow shall allow for one clear lane of traffic (12 feet wide). 3. Maximum spread of water in arterial streets during design flow shall allow for two clear lanes of traffic (24 feet wide). 5.6.3 Drainage Channels and Structures 1. The developer shall install an underground stonn drain on curb and gutter streets beginning at the point where the calculated stonn water runoff is of such a quantity that it exceeds the Stonnwater Criteria 7 of 12