Question

Question 3 The following Table gives monthly flows, precipitation, evaporation and demand rates for a critical 12- month period at a proposed reservoir site. Existing water rights require a monthly release of 10000 m. The average reservoir area is 4 km². Compute the required reservoir capacity. Mo Monthly Monthly Monthly Pptn Evapn Demand (mm) 50 1 2 3 Natural mean flow (106m) 3.37 3.03 3.71 1.47 0.57 0.25 0.60 1.25 3.75 4.00 4.20 4.30 (mm) 130 53 45 30 13 5 4 5 6 7 8 9 10 11 (106m) 0.75 1.05 1.35 2.10 2.42 2.63 2.58 2.30 1.14 0.91 0.82 0.65 83 88 105 153 205 260 278 180 128 80 13 Water Rights Release (10 m) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 3 0 28 80 113 145 12

Answer 1

4,232 20.66 18.08 2.61 salar water monthly (2) (1) Natural mean flow (106 m²) 3.37 (3) Monthly Ppt Evapn (mm) (106m? Wobm?) 130 0.52 0.2 H. 3.03 53 0.332 0.212 (1)+(2) Cumulative Commlative Excess Releofe - (3)-(4) Supply Demand (tom?) (106m²) (106m²) Deficit (106m3) 3.59 3.59 +2.84 2.81 18 + 4.6 0.1 3.438 9.838 3.15 + 6.688 1.07 10.908 5.25 +5.658 -0.09 10.818 7.67 +3.148 -0.65 10.168 10.3 - 0.132 10.382 3 3.71 0.42 01 1.49 30 0.12 0.612 0.57 0.052 5 13 0.02 0.82 0.25 0.1 -0.528 9.64 12.88 -3.24 104 0.012 0.6 3 0.1 0.038 9.678 Hoor-5.502 1.112 o 0 1.25 3,042 12.72 16.32 - 3.6 0.112 0.72 9 3.75 3.708 16.428 19.23 0.512 0.1 -0.802 80 0.32 0.32 01 113 0.452 4.2 0.052 4.728 25:388 18.7 6.688 OL 0.58 145 4.3 12 required capacity of reservoir = mas deficit & max surplus I 6.688 +5.502 12.19x106m3 Any