Drawdown at Well given Radius of Influence Calculator

✖Radius of Influence measured from the center of the well to the point where drawdown curve meets the original water table.ⓘ Radius of Influence [R_w]			+10% -10%
✖Coefficient of Permeability at Drawdown is the velocity in meters or centimeters per second of water through soils during drawdown at well.ⓘ Coefficient of Permeability at Drawdown [K_dw]			+10% -10%

✖The Total Drawdown is defined as the reduction in hydraulic head observed at a well in an aquifer, typically due to pumping a well as part of an aquifer test or well test.ⓘ Drawdown at Well given Radius of Influence [s_t]

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Drawdown at Well given Radius of Influence Solution

STEP 0: Pre-Calculation Summary

Formula Used

Total Drawdown = Radius of Influence/(3000*sqrt(Coefficient of Permeability at Drawdown))
s_t = R_w/(3000*sqrt(K_dw))
This formula uses 1 Functions, 3 Variables

Functions Used

sqrt - A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number., sqrt(Number)

Variables Used

Total Drawdown - (Measured in Meter) - The Total Drawdown is defined as the reduction in hydraulic head observed at a well in an aquifer, typically due to pumping a well as part of an aquifer test or well test.
Radius of Influence - (Measured in Meter) - Radius of Influence measured from the center of the well to the point where drawdown curve meets the original water table.
Coefficient of Permeability at Drawdown - (Measured in Centimeter per Second) - Coefficient of Permeability at Drawdown is the velocity in meters or centimeters per second of water through soils during drawdown at well.

STEP 1: Convert Input(s) to Base Unit

Radius of Influence: 8.6 Meter --> 8.6 Meter No Conversion Required
Coefficient of Permeability at Drawdown: 1E-05 Centimeter per Second --> 1E-05 Centimeter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

s_t = R_w/(3000*sqrt(K_dw)) --> 8.6/(3000*sqrt(1E-05))

Evaluating ... ...

s_t = 0.906519595914935

STEP 3: Convert Result to Output's Unit

0.906519595914935 Meter --> No Conversion Required

FINAL ANSWER

0.906519595914935 ≈ 0.90652 Meter <-- Total Drawdown

(Calculation completed in 00.004 seconds)

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Birsa Institute of Technology (BIT), Sindri

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< Depth of Water in Well Calculators

Depth of Water at Point 1 given Discharge of Two Wells under Consideration

LaTeX Go Depth of Water 1 = sqrt(Depth of Water 2^2-(Discharge*log((Radial Distance at Observation Well 2/Radial Distance at Observation Well 1),e))/(pi*Coefficient of Permeability in Well Hydraulics))

Depth of Water at Point 2 given Discharge of Two Wells under Consideration

LaTeX Go Depth of Water 2 = sqrt(Depth of Water 1^2+(Discharge*log((Radial Distance at Observation Well 2/Radial Distance at Observation Well 1),e))/(pi*Coefficient of Permeability in Well Hydraulics))

Depth of Water in Well given Discharge in Unconfined Aquifer

LaTeX Go Depth of Water in Well given Discharge = sqrt(Thickness of Unconfined Aquifer^2-(Discharge*log((Radius of Influence/Radius of Well),e))/(pi*Coefficient of Permeability in Well Hydraulics))

Depth of Water at Point 1 given Discharge from Two Wells with Base 10

LaTeX Go Depth of Water 1 = sqrt(Depth of Water 2^2-(Discharge*log((Radial Distance at Observation Well 2/Radial Distance at Observation Well 1),10))/(1.36*Coefficient of Permeability in Well Hydraulics))

Drawdown at Well given Radius of Influence Formula

LaTeX Go

Total Drawdown = Radius of Influence/(3000*sqrt(Coefficient of Permeability at Drawdown))
s_t = R_w/(3000*sqrt(K_dw))

What is Radius of Influence?

The “Radius of Influence” is defined as the maximum distance at which the drawdowns can be detected with the usual measure devices in the field.

How to Calculate Drawdown at Well given Radius of Influence?

Drawdown at Well given Radius of Influence calculator uses Total Drawdown = Radius of Influence/(3000*sqrt(Coefficient of Permeability at Drawdown)) to calculate the Total Drawdown, The Drawdown at Well given Radius of Influence fromula is defined as the value of draw down at well when we have prior information of radius of influence. Total Drawdown is denoted by s_t symbol.

How to calculate Drawdown at Well given Radius of Influence using this online calculator? To use this online calculator for Drawdown at Well given Radius of Influence, enter Radius of Influence (R_w) & Coefficient of Permeability at Drawdown (K_dw) and hit the calculate button. Here is how the Drawdown at Well given Radius of Influence calculation can be explained with given input values -> 0.90652 = 8.6/(3000*sqrt(1E-07)).

FAQ

What is Drawdown at Well given Radius of Influence?

The Drawdown at Well given Radius of Influence fromula is defined as the value of draw down at well when we have prior information of radius of influence and is represented as s_t = R_w/(3000*sqrt(K_dw)) or Total Drawdown = Radius of Influence/(3000*sqrt(Coefficient of Permeability at Drawdown)). Radius of Influence measured from the center of the well to the point where drawdown curve meets the original water table & Coefficient of Permeability at Drawdown is the velocity in meters or centimeters per second of water through soils during drawdown at well.

How to calculate Drawdown at Well given Radius of Influence?

The Drawdown at Well given Radius of Influence fromula is defined as the value of draw down at well when we have prior information of radius of influence is calculated using Total Drawdown = Radius of Influence/(3000*sqrt(Coefficient of Permeability at Drawdown)). To calculate Drawdown at Well given Radius of Influence, you need Radius of Influence (R_w) & Coefficient of Permeability at Drawdown (K_dw). With our tool, you need to enter the respective value for Radius of Influence & Coefficient of Permeability at Drawdown and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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