(6) A dam is to be constructed to form a new reservoir. The dam spillway is 35m in length and has a crest elevation of 5

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6 A Dam Is To Be Constructed To Form A New Reservoir The Dam Spillway Is 35m In Length And Has A Crest Elevation Of 5 1 (76.68 KiB) Viewed 13 times

(6) A dam is to be constructed to form a new reservoir. The dam spillway is 35m in length and has a crest elevation of 57.4 m. The spillway outflow (O) can be calculated from: 0= 1.7Lh", where 0 is in m's, L is the spillway length (m) and h is depth of water above spillway crest (m). Table 1 shows the routing curve data for the reservoir. TableQ5-1 Monthly flow volumes Outflow 05 15 28 43 60 78 99 120 (m/s) 139 284 433 588 751 923 1104 1292 At (m/s) 2S +0 0 6 168 7 114 Flow 61 278 0 (1) Construct the reservoir routing curves. [4 Marks) (ii) Assuming that the reservoir is initially full, route the inflow hydrograph shown in Table 2 through the reservoir until time = 10 hours. [12 Marks] TableQ5-2 Monthly flow volumes Time (hr) 0 1 2 3 4 5 8 9 10 11 08 34 116 200 195 (m/s) The following equation may be useful [1, +1]+ 28 At (iii) What is maximum head of water over the spillway and the maximum expected water surface elevation? [4 marks] (iv) Determine the values of translation and attenuation. [2 marks] [ -01-23 +0. At [25 MARKS