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Evergreen Public Library Shelf Weir Calculations Printed 12/8/2018 <br />Water Surface Elevation =C 8.76 FT <br />Crest elevation = <br />8.00I FT <br />IEOut = <br />17 OiFT <br />Weir Length = <br />3.44'1 <br />FT <br />H = <br />0.76 <br />FT <br />P = <br />0.90 <br />FT <br />C = <br />3.61 <br />FT <br />Q = <br />7.86 <br />CFS <br />Q = C (L - 0.2MU"' <br />where Q = flow (cfs) <br />WSEL at bottom of top Slab <br />Weir Capacity Above and Beyond Runoff Rate <br />(5-6) <br />C = 3.27 + 0.40 HIP (ft) <br />H,P are as shown above <br />L = length (ft) of the portion of the riser circumference as necessary not to exceed 5010 of <br />the circumference <br />D = inside riser diameter (ft) <br />Note that this equation accounts.for side contractions by subtracting 0. IH,from L.for each side of the <br />notch weir. <br />Z:\1700001-1700999\1700170 (Everett Public Library South Expansion)\PROJECT DOCUMENTS\Storm <br />Drainage\Calculations\Conveyance\Overflow Weir.xlsx <br />