A lake has a surface area of 7.0 x 105 m² During a given month, the mean inflow to the lake was 2.5 m³/s. The increase in stored lake volume was observed to be 6.5 x 10 m². Precipitation during the same month was 380 mm and evaporation was 320 mm. Calculate the outflow from the lake for the same month in m/s.

Q1/ If concentration of total dissolved salts in Shatt Al- Arab water C = 6000 (p.p.m) and Shatt Al-Arab discharges its water into Arabian Gulf at flow rate Q=200 (m³/s). Calculate weight of Total Dissolved Salts carried by water of Shatt Al-Arab annually into water of the Gulf. ONL

Problem 12. (7.76 Chin) During a critical 24-month period the average monthly inflows to a reservoir and the average water demand are given in Table 7.10. Use these data to estimate the minimum required storage volume of the reservoir to overcome that critical period. TABLE 7.10 Average inflow Average demand (m³/s) Average inflow Average demand Average Average inflow (m³/s) demand (m³/s) Month* (m³/s) (m³/s) (m³/s) Month Month 1000 1100 1200 1300 1350 1270 1120 1230 1320 1250 1240 1550 1600 850 1300 17 1400 1400 1400 1130 10 1200 18 11 12 13 19 20 21 1310 1370 1100 1000 1170 1210 1000 1400 1400 940 1000 1300 1260 1400 14 820 1100 22 1200 1400 1400 880 1040 1200 1300 15 23 1100 930 16 1290 24 1080 1000

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