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Olrt 35aco 1 d C 1VIa dtah Inc. 4-SF-06 <br />e N61NIraa CONaTNYCTOxa SITE PREPARATION & DRAINAGE REV. 1 <br />SALT uxs cnv. UTAH STANDARD FORM <br />RUNOFF & SEDIMENT CALCULATIONS 9/80 <br />SHT. 11 OF 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT \VE'57CQr -3 rr BLS V"r- -$ftio M JOB NO. -QG- 31_L _ <br />SEOiw+cNTa�__�,�_ �?•.an.._�- _P_Y�I�7nl_. - -- PONDNO. 2P_! <br />BY Wn (�J -DATE :0-b•00 CHECKED BY DATE <br />9. DESIGN OF EMERGENCY SPILLWAY <br />10 year 24 hour Storm Discharge 0 = 2 cfs (See Section 6) <br />25 year 24 hour Storm Discharge 0 = 4 B• 4 cfs <br />ld� year 24 hour Storm Discharge Q = IlLs �ncluci�S wi3�Gr$4.�ds rJ(iV.l- 3 �u� - ;� <br />5,C S4aa-ks IIGt 11d� <br />HP= 4' h L = ft b =j&�—ft F= Z.O <br />(max) <br />Spillway material 0 - 1 P ZAP n=0. Allowable velocity 12 ft/sac <br />C= Q DES — O PRINC. = 1LL - 32.2= 25cf <br />or Q= QDES =III.L2cfs (Assume principle spillway plugged) <br />o =11'i. 5 = 36 <br />Hp = a (Charts ES -610 SCS TR No. 35) <br />b {b q � <br />Se = O Ve = 6_I (Charts ES -600 SCS TR No. 35) <br />Top of Dam Elevation = Crest of Em. Spillway + Hp + 1.0 ft <br />= 562 6 + 7.0 + 1.0 ft = %?-q ft (Settled Elevation) <br />Earth spillway � Control <br />section T\ <br />.� channel HP =�Or Control5ection <br />/ Level section Level Section <br />v <br />1 <br />Mt N. 30' <br />Inlet channel 0 2% <br />CL Embankment Hp So <br />Plan of earth spillway L <br />Profile of emergency spillway <br />H = Difference in elevation between vest of earth spillway at the <br />control section and water surface in reservoir, ft. <br />b = Bottom width of earth spillway at the control section, h. <br />n = Manning's coefficient of roughness <br />Q = Total discharge, in cfs <br />S = Flattest slope allowable for channel below control section, %. <br />V = Velocity, in feet per second, that will exist in channel below <br />control section (at design 0) if constructed to slope, S. that is <br />shown. <br />x Side slope ratio. <br />a 1- <br />1 11 <br />I b I <br />Cross section of earth <br />spillway at control section <br />