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COP,~iENT <br /> <br />IV DRAINAGE <br /> <br />Pg. 3of6 <br /> <br />ITEM <br /> <br />A <br /> <br />B <br /> <br />GENERAL <br /> <br /> 1. Hydrology: Watershed area; "c" <br /> for ultimate development; frequency; <br /> time of concentration; intensity; <br /> A.C.F.C. & W.C.D. mean annual pre- <br /> cipitation & unit frequency. <br /> Duration curves, calculations OK; <br /> <br /> Q's agree with master study, if any <br /> 2. Hydraulics: Velocity - min. 2 fps, <br /> max. 15 fps; freeboard 1' min. <br /> from H.G.L. to T.O.C.; losses <br /> for all structures & bends; size <br /> adequate <br /> 3. Drainage pattern agrees with <br /> grading plan <br /> 4. Offsite drainage is intercepted <br /> 5. Site free from 100 year inun- <br /> dation <br /> 6. Open channels, ditches, swales <br /> shown' including x-sections <br /> 7. Pipe class: a. Title sheet note <br /> or on plan <br /> b. Approved Alternates <br /> 8. Special Structures detailed <br /> 9. Alameda County Flood Control & <br /> Water Conservation District <br /> letter and compliance <br />10. Erosion and Silt Control Plan <br />11. Pad Elevations - If within <br /> 100 year flood plain <br /> <br /> PLAN <br /> <br /> 1. Pipe: <br /> a. Type & size shown <br /> b. Min. 12" diameter <br /> c. Max. deflection 5° <br /> d. Located on the north & east <br /> sides of streets, 5 ft. from <br /> centerline <br /> e. Alignment tied to street <br /> centerline <br /> f. Only one (1) horizontal or <br /> vertical deflection or <br /> curve between MH or CB <br /> 2. Valley gutters allowed only on <br /> special approval of City Engineer <br /> 3. Catch basin: 1000 ft. max. or <br /> when street flow exceeds T.O.C. <br /> 4. Inlets and outlets adequate & <br /> protected <br /> 5. Std. structure adequate for <br /> pipe size <br /> 6. MH or CB: <br /> a. At every junction <br /> b. Every 500 ft. max. <br /> c. At BC's or EC's <br /> 7. Ties and or stationing for: <br /> a. All structures <br /> b. Deflections and curves <br /> 8. All structures clearly shown <br /> 9. Curve date & deflection angles <br /> shown <br />10. Easements (on & off site!) <br /> <br /> <br />