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This is the previous example the answer is there in cgegg: A confined aquifer has been...

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Civil Engineering

This is the previous example the answer is there in cgegg:

A confined aquifer has been fully penetrated with a well of 200mm diameter The thickness of the aquifer is 25 m. If you know thatthe well was pumped at a constant rate of 2000 m3/dayand the steady state drawdown in the well is 8 m and the drawdownin a piezometer 100 m from the well is 1.4 m. Calculate thefollowing:

  1. Aquifer transmissivity, hydraulic conductivity of the aquifermaterial and the radius of influence of the well.
  2. If the aquifer is unconfined, Do the calculation again assumingthat the saturated thickness is 25 m.

c. Assume the well efficiency is 85 %, calculate the values ofT, K and R.

........Design the well in the previous example for the case ofconfined aquifer by finding the following:

  1. Screen length and size.
  2. Delivery pipe diameter.
  3. Calculate the power needed for this well.
  4. Draw schematic diagram for the well and define all parts.

Assume any missing data.

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