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A 20 cm well penetrates 30 m below static water level. After a long period of pumping at a rate of 1800 lpm, the drawdowns in the observation wells at 12 m and 36 m from the pumped well are 1.2 m and 0.5 m respectively. Determine the i. Transmissibility of the aquifer ii. Specific capacity of the well. (?
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A 20 cm well penetrates 30 m below static water level. After a long pe...
Calculation of Transmissibility and Specific Capacity


Given data:


  • Diameter of the well (d) = 20 cm

  • Penetration of the well (H) = 30 m

  • Drawdown at 12 m (s1) = 1.2 m

  • Drawdown at 36 m (s2) = 0.5 m

  • Pumping rate (Q) = 1800 lpm



Calculation of Transmissibility:

The transmissibility of an aquifer represents its ability to transmit water. It is calculated using the following formula:

T = kH


  • Where, T = transmissibility

  • k = hydraulic conductivity of the aquifer

  • H = penetration of the well


As the hydraulic conductivity of the aquifer is not given, we assume it to be 10 m/day (which is the typical value for a sandy aquifer).

So, T = 10 x 30 = 300 m2/day


Calculation of Specific Capacity:

The specific capacity of a well represents its ability to yield water. It is calculated using the following formula:

SC = Q/s


  • Where, SC = specific capacity

  • Q = pumping rate

  • s = drawdown


So, specific capacity at 12 m = 1800/1.2 = 1500 lpm/m

Specific capacity at 36 m = 1800/0.5 = 3600 lpm/m


Conclusion:


  • Transmissibility of the aquifer (T) = 300 m2/day

  • Specific capacity of the well at 12 m (SC) = 1500 lpm/m

  • Specific capacity of the well at 36 m (SC) = 3600 lpm/m

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A 20 cm well penetrates 30 m below static water level. After a long period of pumping at a rate of 1800 lpm, the drawdowns in the observation wells at 12 m and 36 m from the pumped well are 1.2 m and 0.5 m respectively. Determine the i. Transmissibility of the aquifer ii. Specific capacity of the well. (?
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A 20 cm well penetrates 30 m below static water level. After a long period of pumping at a rate of 1800 lpm, the drawdowns in the observation wells at 12 m and 36 m from the pumped well are 1.2 m and 0.5 m respectively. Determine the i. Transmissibility of the aquifer ii. Specific capacity of the well. (? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A 20 cm well penetrates 30 m below static water level. After a long period of pumping at a rate of 1800 lpm, the drawdowns in the observation wells at 12 m and 36 m from the pumped well are 1.2 m and 0.5 m respectively. Determine the i. Transmissibility of the aquifer ii. Specific capacity of the well. (? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 20 cm well penetrates 30 m below static water level. After a long period of pumping at a rate of 1800 lpm, the drawdowns in the observation wells at 12 m and 36 m from the pumped well are 1.2 m and 0.5 m respectively. Determine the i. Transmissibility of the aquifer ii. Specific capacity of the well. (?.
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