(b) 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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B 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 (53.6 KiB) Viewed 30 times

(b) 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 0 5 15 28 43 60 78 99 120 (m/s) 25 +O 0 139 284 433 588 751 923 1104 1292 At (m/s) 0 1 (i) 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 6 7 8 9 10 11 Flow 0 34 116 200 195 168 114 61 27 80 (m/s) 8 0.1-[23+ The following equation may be useful 25 25 +0, 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]