Question

Question 3.A groundwater aquifer has a surface area of 15 km2 and saturated groundwater depth 500 cm from ground surface The saturated thickness is 100 meter(the water bearing material filled with water).. The groundwater inflow to the aquifer 12 m/s and the outflow from the aquifer is 6 m3/s. Three well pump water one at 2 m'/s, the second at 3 m3/s. and third a rate 4 m3/s. The aquifer receive recharge of 500 mm per year. Large number of trees extraction water from the aquifer through evapo-transpiration at a rate of 2 mm/second .The aquifer material porosity is 0.2 .Estimate the groundwater storage in m3 per year and also the changes in groundwater elevation in cm

Answer 1

Polarity = 0.2 implies 20% (n) vol of voids/total vol = 20% aquifer Surface area = 15KM^2 (A) Hrickness = 100m (T) inflow = 12 m^3/s out flow = 6M^3/s wells = (2 + 3+ 4)m^3/s = 9M^3 /s Total flow = 6 + 9 = 15M^3 /s Rainfall = 500 mm/year Tress - evapotranspiration = 2 mm/sec Ground water storage = implies n times A times T = 0.2 times 15 times (1000)^2 times 100 = 3 times 10^8 m^3 lowest volume = implies Inflow - Out flow implies 3 times 10^8 + (12 - 15) times 31.53 times 10^6 + 7.5 times 10^76 - 10.95 times 10^6 implies 3 times 10^8 - 94.59 times 10^6 - 3.45 times 10^6 implies 300 times 10^6 - 98.04 times 10^6 implies 201.96 times 10^6 depth = 201.96 times 10^6/15 (1000)^2 times 0.2 = 201.96 times 10^6/15 times 10^6 times 0.2 = 67.32 m depth Thumbs up please