7431 EVERGREEN WAY TACO BELL 2018-01-01 MF Import

The maximum allowable depth in vegetated swales is 6 inches for emergent �;wales. The following information Is required for City revieG and approval of vegetated swales: 1) design flow calculation 2) velocity and flow depth calculations 3) bypass sizing calculations 4) copy of site plan showing the contributing area 5) calculation of the hydraulic residence time in the swale PLAN REV=EN COMMENTS Vegetate3 awales: The following requirements and drawings from the City�s Design and Construction Standards an3 Specifications should be included on both the drainage plans and on any landscape plans For the area: �� 1) The City's vegetated swale construction requirements from section 4-12.4(2). Z� 4) The vegetated swale planting requirements, including the vegetated swale seed and wetland plant lists from section 4-12.3. The swale cross sections and plan view shown in City standard drawing #419. The vegetated swale maintenance requirements from section 4-12.5 of the City's standards. Vegetated swales are to be designed with a minimum freeboard �•' of 0.5 feet above the ma�imum design depth. City standards require the entire associated side slope of J the swale, from the bottom of the swale to the top of the adjacent bank, to have a maximum slope of 3:1 unless rockeries or retaining walls are used. The retaining walls constructed in association with the swale may not provide the required 0.5 feet of freeboard. Therefore, the location where the 3:1 side slope of the L� swale meets the retaining wall must be 1.5 horizontal fee'.: from the maximum design water level in the swale. The maximum design depth of flow in the swale should be �� shown on the swale cross-sectional detail. � �I� �` `�Landscaping may ��,�i�� the swale. cc��l ° ��^ r,�� `{�-t� 1��„�hcc�!U! �L, ��l�ky ��bM� i�.1"U �� (' I ��, not be provided within the freeboard area of ✓