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<br /> <br />,fof>J, ~ncon s~nvfaZltdh ,inc. a-sF.o6 <br />FMGIMEFIr/.COIr/TIIUCTOe/ SITE PREPARATION & DRAINAGE REV. 1 <br />awFr EwxE crtv, UT~N STANDARD FORM <br />RUNOFF 8~ SEDIMENT CALCULATIONS 9/BO <br />SHT. 11 OF 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT \VEST62rJ rV6L.5 GESEICA,Do_ /~\iN~______-_ JOB NO. yG~_#.(o. <br />1ZEFUSE A2EP ~ 2 ~ 3 _ .._ __ _ _ _.__ __ POND NO. _(~(~_.2F3 <br />BY O, ln.~y_ _ _ DATE ~J ~ 2"1 - ~D __ _ _ CHECKED BY ___ DATE <br />9. DESIGN Of EMERGENCY SPILLWAY <br />10 year 24 hour Storm Discharge 010 = 34'Scfs (See Section 6) <br />25 year 24 hour Storm Discharge 025 =~?~ds <br />-year 24 hour Storm Discharge OI 1 =-cfs <br /> <br />HP=? ft L= 50 ft b= iU ft Z= Z <br />(max) <br />Spillway material Ri~ RAC n = C o¢ gllowable velocity 12- ft/sec <br />0=0 0 =~i2.b -34_5=IG_3cfs <br />DES PRINC. <br />or 0 -ODES = h2.~ cfs (Assume principle spillway plugged) <br />0 = 52.3 ~ 5.20 Hp = I.5'I (Charss ES•610 SCS TR No. 35) <br />b to <br />Sa = I %•l5 Ve = `1.5 (Charts ES-600 SCS TR No. 35) <br />Top of Dam Elevation =Crest of Em. Spillway + Hp + 1.0 ft <br />=5495.3+ 1.5~ + 1.0 ft =`~~1~gTft (Settled Elevation) <br />U5c 5496,0 <br />Earth spillway <br />7 ~ Control <br />section ~Tl <br />r cnanne~ <br />/' Leval section <br />I <br />Inlet channel <br />Embankment <br />Plan of earth spillway <br />Hp I = I,cil <br />Section <br />Level Section <br />tN 30' <br />S " 2%M s <br />N ° e <br />P <br />L <br />Profile of emergency spillway <br />Hp = Difference in elevation between crest of earth spillway at the <br /> <br /> mntrol section and water surface in reservoir, ft. Z <br />Z <br />b = Bottom width of earth spillway at the control section, ft. r <br />~ 1 1 I <br />n = Manning's coefficient of roughness <br />O = Total discharge, in cfs Ls-~ <br />Se = Flattest slope allowable for channel below control section, °.'e. b <br />V <br />= Velocity, in feet per second, that will exist in channel below <br />e control section (at design 01 if constructed to slope, S, that is Cross section of earth <br /> shown. spillway at control section <br />z = Side slope ratio. <br />0 <br />a <br />0 <br />r <br />10.80 <br />