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Lovelace Road Transfer Station <br /> Storm Drainage Design Criteria and Calculations <br /> Following are the design criteria to be used or calculations performed for the design of <br /> the Station renovation project. The criteria are indexed according to (when applicable) <br /> the San Joaquin County. Improvement Standards, Department of Public Works, <br /> September 1991 (Standards). Where calculations or criteria have already been applied <br /> or performed, they are referred to in past tense and attached. The index numbers <br /> below generally match section numbers in the improvement standards. <br /> 3.21 Storm Frequency <br /> Storm frequency for drainage design is the 100 year storm. IFD curve, provided <br /> by Solid Waste Division was used for the retention pond design (Attachment 1) <br /> and for calculations for pipe system design (Attachment 2). <br /> 3.30 Design Storm Runoff <br /> The rational formula as described in Section 3.3 was used (Attachment 2). Runoff <br /> coefficients were weighted from Table 3-1. Intensity was from 100 year curve <br /> (attachment 1, Page 3/3). Minunum inlet time was 10 minutes (General Industrial, <br /> Table 3-2; Standards). <br /> 3.33 Off-site flows <br /> Site grading plans will not allow off-site flows to be part of contributory drainage <br /> area. <br /> 3.34 Drainage diversion <br /> All on-site flows will be discharged to the proposed on-site retention pond. <br /> Drainage diversion to of on-site flows to off-site is not proposed. <br /> 3.40 Hydraulic Criteria <br /> The Manning equation was applied as required in 3.41. <br /> 3.42 Pipe flow criteria <br /> The HGL was calculated under the condition that the pond would be holding 1 <br /> (one) 100-year storm. All inlets exceed 1 ft between the grates and HGL. <br /> 07549001.012-APPE 1 September 22,1993 <br />