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5255NSCResponse
Attached to the e-mail RAL20/0025 - Response to Information Request.
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ail Callaghan & Toth APPENDIX A - Overland Flow Calculations Total runoff from Key Court at 1% AEP: Area = 14314.3m? = 1.43ha Qioo = (CIA)360 Where: e fi=0.8 e C10=0.86 e fy=1.20 ¢ Standard inlet time = 15min (Table 4.6.2) - Iyoo/15 = 211.40mm/h . _ 1 xX 211.40mm/h x 1.43ha * Qioo 360. :. Total AEP 1% = 0.84m?/s Pipe capacity at 1% AEP (sag at No. 19): 300 DIA outlet invert level 0.7 Approx Assuming local AEP 1% flood level = canal BDY = RL1.55 Head loss available for total local AEP 1% = Easement channel invert high point - RL1.55 “= 2.2 -1.55 = 0.65m pipe length = 35m Approx. pipe velocity = 1.5m/s (conservative) Approx. inlet loss = 1.5V?/2g = 0.17m 0.65 — 0.17 Hydraulic grade for pipe = 35m 2103 19 Key Ct SWMP February 2021
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