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I <br /> I <br /> Determining Pond Surface Area: <br /> WWHM2012 10 —Year Storm Flow:2.8417 CFS <br /> Apond = 2,083 x 2.8417 cfs = 5,920 ft2 <br /> Aprovided = 6,000 ft2 <br /> IDetermining Riser Dimensions: <br /> • Dewatering Orifice <br /> IArea =Ao (in2) = 1.4401—per cfs of inflow <br /> IWhere h = head of water above orifice in feet <br /> Diameter=D (in) = 1.13 Ao <br /> ID = 1.13W1.14 3.5)=4.8" <br /> IUse 5"0 Dewatering Orifice for pond. <br /> • Polyethylene Drainage Tubing Diameter= 2" larger than Dewatering Orifice <br /> IRound up to a standard 8"0 Polyethylene Drainage Tubing <br /> I • Overflow Riser Diameter <br /> Determined using Figure 3.5 in Appendix H <br /> IUse 18"0 corrugated metal riser for sediment pond. <br /> Installation Schedules: Start of project and replaced as needed and at start of wet season. <br /> I Inspection and Maintenance plan: Responsible staff to make weekly site walks and inspections <br /> to identify deficiencies in onsite BMPs and anticipate potential problems and remedies. <br /> I Responsible Staff: Identified Certified Erosion and Sediment Control Lead in Section 3 of this <br /> SWPPP. <br /> I <br /> Page 110 <br />