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<br />1 SEDIMENTATION POND E DESIGN CALCULATIONS <br />(Cont'd) <br />1 EMERGENCY SPILLWAY CALCULATIONS: <br />1 Broad rested Spillway Design: <br />(Applied Hydrology and Sedimentolo~y for Disturbed Areas; Barfield, Warner, Haan: <br />1981) U <br />i Q = 28.6 cfs ~~~' <br />Maximum velocity 4.0 fps ~~ \~ 1r ~~ <br />1 2vah sideslopes ~U~ ~,lo\`y,."~~ ~~ ~ <br />n = 0.04 ~ ~c p <br />Slope = 0.03 ft/ft 1/l ~ ~ J ~J~~ <br />1 /` f <br />Hec = 0.75 Fig. 48.14 (~ , ` <br />1 Hp = 0.86 Fig 48.1 <br />Q' = 0.544(g) 1/2 (Hec) 3/2 b <br />1 Q' = 0.544 (32.2) 1/2 (0.75) 3/2 (100) = 201 <br />Q= 28.6=Q'(1.5b+2(Hec))/150 <br />1 Q = 201 (1.5 b + 2(0.75)) / 150 <br />b = 13.2' <br />1 Spillway is 13.2 ft. width across the bottom. Depth of spillway is 1.86 ft. mini um. <br />Will need to rip rap emergencyy spillway. <br />1 ~~~ r~~~~ = a~,s <br />Q ~ ~ <br />~~ 5 b Z ~' ••z ~. S _ <br />1 Q - ~ ~ «o e~,' = 1~ O <br />.= ; <br />1 ~°rov L_. \,1 -1- Q-o ~tv) ~5H ,\36 Q:oy ~p~~1~ <br />1 .UPS L- I-I +~y~a~66,~~1136 io~GG.6~= <br />i I~ _ ~ _ _ - <br />G ~``-- ~ 1a(o E~~ov - a.a ~~~~ va~7;l~o,s~~. ~ ~aal~ °~~ <br />