Laserfiche WebLink
<br />Finished elevations of new pavement pading 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 IOO-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 />I. 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. MID..;mum spread of water in collector streets during design flow shall allow for one clear lane <br />of tmffic (12 feet ",ide). <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. TIle street is to be designed to convey the IOO-year event to the outfall point with successively <br />lower high points. A dedicated easement must be provided at the tenninus to allow the IOO-year <br />event to sheet flow to tile ultimate outfall. In lieu of sheet flow it is allowable for tile developer to <br />construct an underground system to convey the IOO-year event. <br /> <br />5.6.3 Drainage Channels and Structures <br /> <br />I. The developer shall install an underground stonn drain on curb and gutter streets beginning at <br />the point where calculated storm water nllloff is of such quantity that it exceeds the height <br />specified above. The developer shall construct the stoml drain system from the point to an <br />approved outlet. <br />2. For non-curb and gutter strcets, the developer may use open channel (channel or ditch) metllods <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 tI1an ilie standard street/ditch section. <br />3. Iftl1e developer locates the channcl in a widened street right-of-way, the City shall approve the <br />right-of-way width and channel configuration. The depili of flow in the channel shall not exceed <br />one (I) foot as measured from the ditch flowline to the point 011 ilie roadway established as tile <br />high water level in this section. <br />4. The developer shaU design and construct aU channels to tenninate at an approved outlet. <br /> <br />5.6.4 Habitable Structures <br /> <br />TIle developer shall provide adequate means for storm water run-off in excess of the ~design stonn" <br />capacity (i.e., 3. lO-year stoml) to flow aroUfld habitable structures. <br /> <br />a.) TIle developer shall provide a grading/drainage plan which shows that aU building sites can <br />provide a finished floor elevation: <br /> <br />(1) At least one foot (l ') abovc the top of tile 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 tile crown of ilie road elevation, using tIle highest point <br />along the portion of such road fronting thc building site. <br />(3) At least one foot above the grOlmd elevation along aU sides of the building site. <br /> <br />b.) In addition to paragraph (a) above, the developer shall provide a gradillgldminage 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 fiU required to bring <br />building pads into compliance wiili this code. <br />d.) A1temate methods of building protection may be accepted by the City upon submittal of <br />dctailed infonnation, review and approval by the City Engineer. <br /> <br />S10nnwaler Criteria Page 7 of 10 <br />