Answer Happy

5. (a) With respect to hydrograph routing, explain the underlying difference between "river routing" and "level pool routing". [3 Marks] (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 is in m'/sL is the spillway length (m) and his 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) 2s 139284433588 751 923 1104 1292 At (m/s) lo +0 (1) 6 Construct the reservoir routing curves. [4 Marks) (IT) 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 7 8 9 10 11 Flow 0 8 34 116 200 195 168 114 61 27 8 0 (m/s) The following equation may be useful [1, 25, (i) 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] 25 les +bel+L -0,1 - [+03 At At 125 MARKS