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Civil engineering hydrualic design spillway design

Civil engineering hydrualic design spillway design

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CE311-ASSIGNMENT 02SPILLWAY DESIGN HYDRAULIC DESIGN OF SPILLWAY 1. Introduction Spillway is required for a reservoir to release flood discharge during rainy seasons not allowing flood water to overtop the dam. Main function of spillway is to carry flood water not required to be stored in the reservoir, safely to the river downstream of the dam. 2. Design Parameters Registration Number - 155 n1 =Remainder [155/25] n1 =5 n2 =Remainder [155/15] n2 =5 2.1 Catchment characteristics Catchment Area, A=400-10 n1 =400-10×5 =350 km2 L=20+ n2 Lc = 10+0.6× n2 =20+5 =10+0.6×5 =25 km =13km 2.2 Snyder’s Coefficients C1=1.80-0.02× n1 Cp = 0.6-0.01× n2 =1.80-0.02×5 =0.6-0.01×5 =1.70 =0.55 2.3 Design Rainfall Intensities α = (n1+ n2+5)/50 = (5+5+5)/50 = 0.3 Total Rainfall, R = 150mm αR=0.3×15 (1-αR) = (1-0.3)×15 =4.5 cm =10.5 cm 2.4 Storage Elevation Relationship Table 1: Variation of storage vs afflux H(m) Storage×106(m3) 0 0 1.0 11.8 2.0 27.2 3.0 45.6 4.0 69.2 3. Generation of Design Flood Hydrograph 3.1 Unit hydrograph Using Snyder’s Method tp tr =5.5 tp =0.75C1(L.Lc)0.3 7.229 =0.75×1.70×(25×13)0.3 = =7.229h = 1.314h 5.5 tR =4h 21 tR tpR = 22 tp + 4 21 qpR = 4 2.75×Cp tpR 2.75×0.55 = 22 × 7.229 +4 = =7.900h =0.191 m3/s/km2 7.900 5.0 98.7 5.56 tb =qpR 5.56 = 0.191 =29.11h W75=1.22qpR-1.08 W50 =2.14qpR-1.08 =1.22×0.191-1.08 =2.14×0.191-1.08 =7.292h =12.791h Units of the values, L and Lc used in above equati ...
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