Laserfiche WebLink
REVISED <br />7/30/85 <br />~ Table 2 <br />' SEDIMENTATION POND E DESIGN CALCULATIONS <br />(Continued) <br />' SPILLWAY DESIGN SUMMARY: <br />- Depth of flaw is 0.5 ft.~ <br />' - Velocity of flow is 5.2 fps <br />- Bottom of spillway is 1.5 ft below top of dam ~- <br />' - Width of spillway is 13.2 ft across botton~ <br />- Side slopes are lv:2h v <br />- Gradient of spillway is 3% `~ <br />1 <br />EMERGENCY SPILLWAY CALCULATIONS: <br />' Broad-crested Spillway Design: <br />(Applied Hydrology and Sedimentology for Disturbed Areas; Barfield, <br />' Warner, Haan: 1981) <br />Q = 28.6 cfs ~ <br />Maximum velocity 5.2 fps ci <br />' ~~ 2v:lh sideslopes c/ <br />n = 0.04 ~ <br />' Slope = 0.03 ft/ft <br />Hec = 0.75 Fig 48.14 ~ <br />' Hp = 0.86 Fig 48.1 ~ <br />Q' = 0.544(9) ~(Hec)3/2b `~ <br />' Q' = 0.544 (32.2)#(0.75)3/2(100) = 201 ~ <br />Q = 28.6 = Q'(1.5b + 2 Hec)/150 J <br />b = 13.2' <br />Q = 201 (1.5b + 2(0,75))/150 `~ <br />Spillway is 13.2 ft. width across the bottom. Depth of spillway is 1.5 <br />' ft. minimum. Will need to riprap emergency spillway. ~~ <br />~ ,~~ G ~~ y <br /> <br />_10_ <br />