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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 with the City prior to any <br />development approvals. <br /> <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. The <br />developer shall design and construct such discharge point, or outlet, to prevent damage to or overflowing <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 capacity. <br /> <br />Finished elevations of new pavement, parking areas, or other improvements shall be designed so that each <br />succeeding high point is lower when moving in a downstream direction. This ensures the 100-year <br />discharge has an unobstructed path to the discharge point whether discharging to a channel or detention <br />pond. <br /> <br />5.6.2 Public Streets as Drainage Facilities <br /> <br />1. Maximum depth of water to be allowed in local streets during design flow shall be at the top <br />crown, or top of curb, whichever is less. <br />2. Maximum spread of water in collector streets during design flow shall allow for one clear lane <br />of traffic (12 feet wide). <br />3. Maximum spread of water in arterial streets during design flow shall allow for two clear lanes <br />of traffic (24 feet wide). <br />4. The street is to be designed to convey the 100-year event to the outfall point by successively <br />lower high points. A dedicated easement must be provided at the terminus to allow the 100-year <br />event to sheet flow to the ultimate outfall. In lieu of sheet flow it is allowable for the developer to <br />construct an underground system to convey the 100-year event. <br /> <br />5.6.3 Drainage Channels and Structures <br /> <br />1. The developer shall install an underground storm drain on curb and gutter streets beginning at <br />the point where calculated storm water runoff is of such quantity that it exceeds the height <br />specified above. The developer shall construct the storm drain system from the point to an <br />approved outlet. <br />2. For non-curb and gutter streets, the developer may use open channel (channel or ditch) methods <br />to dispose of storm water specified above. Such channels may be in dedicated draining easements <br />outside the standard street right-of-way upon City approval of the location and alignment of such <br />easements. Alternatively, the developer may widen the street right-of-way to accommodate an <br />open channel of greater capacity than the standard street/ditch section. <br />3. If the developer locates the channel in a widened street right-of-way, the City shall approve the <br />right-of-way width and channel configuration. The depth of flow in the channel shall not exceed <br />one (1) foot as measured from the ditch flowline to the point on the roadway established as the <br />high water level in this section. <br />4. The developer shall design and construct all channels to terminate at an approved outlet. <br /> <br />5.6.4 Habitable Structures <br /> <br />The developer shall provide adequate means for storm water run-off in excess of the “design storm” <br />capacity (i.e., 3, 10-year storm) to flow around habitable structures. <br /> <br />Stormwater Criteria Page 6 of 10 <br /> <br />