Question

An engineer has been asked to investigate illegal pumping of groundwater from an unconfined aquifer. The maximum withdrawal rate for the well has been set by the State Water Resources Board at 30,000 ft/day. The water table far from the well is 20 f below the surface. The depth to the confining bed is 50 ft. Two observation wells have been installed near the pumping well to assess the groundwater withdrawal rate. The first well is located 100 ft from the pumping location, where the water table has been drawn down by 2 ft. The second well is located 300 ft from the pumping location, where the groundwater has been drawn down by 0.5 ft. The hydraulic conductivity of the aquifer is 200 ft/day. Has the maximum pumping rate been exceeded? Q? Monitoring Wells 50 h

Answer 1

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82 C 56 AJODE

In aquities Hieght of water yaole in el + cuanclown is always equal to Hiegnt ob groundwater HIASI = Hiegnt of Groundwater table. Totu Depth of aquifies bed=so'= Depth of Groundwater 201 Hence tiegnt of aroundwater from bottom=so - 20' = 30' -H Hence HITSI = H2+52= 30' =H for first well-ri= 1000 ft orandown si=2ft HIE 30-2=28ft second well 82=300ft r Drawdown S2=0.5 ft H2=30-0.5 = 29.5ft ant Hychawlic conductivity = 200ft/day,

q=KT [H2²_HP] 2.303 logior 8 ) - 2000 ft/day T [ 29.52-282] 2.303 Tug [300] = 4a319.22 ft3 laay yes maximum pumping Rate has been excedeen as it was 30,000 Ft 3 day that can be extracted out here pumped amount is 49319.2 ft31 day