Observed drawdown in unconfined aquifer Calculator

✖Observed Drawdown in the Unconfined Aquifer is the reduction in hydraulic head observed at a well in an aquifer.ⓘ Observed Drawdown in the Unconfined Aquifer [s]			+10% -10%
✖Aquifer Thickness (at Midpoint between Equipotential lines) or otherwise is the thickness of aquifer in which the pore spaces of rock forming the aquifer may or may not be with water.ⓘ Aquifer Thickness [b]			+10% -10%

✖Possible Drawdown in Confined Aquifer is the drawdown that would have occurred if the aquifer had been confined (that is, if no dewatering had occurred).ⓘ Observed drawdown in unconfined aquifer [s']

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Observed drawdown in unconfined aquifer

Formula

`"s'" = "s"-(("s"^2)/(2*"b"))`

Example

`"2.7m"="3m"-((("3m")^2)/(2*"15m"))`

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Observed drawdown in unconfined aquifer Solution

STEP 0: Pre-Calculation Summary

Formula Used

Possible Drawdown in Confined Aquifer = Observed Drawdown in the Unconfined Aquifer-((Observed Drawdown in the Unconfined Aquifer^2)/(2*Aquifer Thickness))
s' = s-((s^2)/(2*b))
This formula uses 3 Variables

Variables Used

Possible Drawdown in Confined Aquifer - (Measured in Meter) - Possible Drawdown in Confined Aquifer is the drawdown that would have occurred if the aquifer had been confined (that is, if no dewatering had occurred).
Observed Drawdown in the Unconfined Aquifer - (Measured in Meter) - Observed Drawdown in the Unconfined Aquifer is the reduction in hydraulic head observed at a well in an aquifer.
Aquifer Thickness - (Measured in Meter) - Aquifer Thickness (at Midpoint between Equipotential lines) or otherwise is the thickness of aquifer in which the pore spaces of rock forming the aquifer may or may not be with water.

STEP 1: Convert Input(s) to Base Unit

Observed Drawdown in the Unconfined Aquifer: 3 Meter --> 3 Meter No Conversion Required
Aquifer Thickness: 15 Meter --> 15 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

s' = s-((s^2)/(2*b)) --> 3-((3^2)/(2*15))

Evaluating ... ...

s' = 2.7

STEP 3: Convert Result to Output's Unit

2.7 Meter --> No Conversion Required

FINAL ANSWER

2.7 Meter <-- Possible Drawdown in Confined Aquifer

(Calculation completed in 00.004 seconds)

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Coorg Institute of Technology (CIT), Coorg

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< 8 Source of Water Derived from Wells Calculators

Observed drawdown in unconfined aquifer

Go Possible Drawdown in Confined Aquifer = Observed Drawdown in the Unconfined Aquifer-((Observed Drawdown in the Unconfined Aquifer^2)/(2*Aquifer Thickness))

Balance equation when reduction in natural discharge equal rate of withdrawal

Go Natural Recharge = (Natural Discharge-Reduction in Natural Discharge)+Rate of Withdrawal

Equation for rate of natural discharge when cone of depression ceases to expand

Go Natural Discharge = Natural Recharge+Change in Recharge-Rate of Withdrawal

Equation for ground water storage when recharge exceeds discharge

Go Change in Groundwater Storage = Natural Recharge-Natural Discharge

Equation for recharge when recharge exceeds discharge

Go Natural Recharge = Natural Discharge+Change in Groundwater Storage

Equation for recharge when discharge exceeds recharge

Go Natural Recharge = Natural Discharge+Change in Groundwater Storage

Natural discharge when discharge exceeds recharge

Go Natural Discharge = Natural Recharge-Change in Groundwater Storage

Natural discharge when recharge exceeds discharge

Go Natural Discharge = Natural Recharge-Change in Groundwater Storage

Observed drawdown in unconfined aquifer Formula

Possible Drawdown in Confined Aquifer = Observed Drawdown in the Unconfined Aquifer-((Observed Drawdown in the Unconfined Aquifer^2)/(2*Aquifer Thickness))
s' = s-((s^2)/(2*b))

What is Unconfined Aquifer?

An Unconfined Aquifer is an aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.

How to Calculate Observed drawdown in unconfined aquifer?

Observed drawdown in unconfined aquifer calculator uses Possible Drawdown in Confined Aquifer = Observed Drawdown in the Unconfined Aquifer-((Observed Drawdown in the Unconfined Aquifer^2)/(2*Aquifer Thickness)) to calculate the Possible Drawdown in Confined Aquifer, Observed drawdown in unconfined aquifer can be used for when the effect of dewatering of the aquifer can be eliminated. Possible Drawdown in Confined Aquifer is denoted by s' symbol.

How to calculate Observed drawdown in unconfined aquifer using this online calculator? To use this online calculator for Observed drawdown in unconfined aquifer, enter Observed Drawdown in the Unconfined Aquifer (s) & Aquifer Thickness (b) and hit the calculate button. Here is how the Observed drawdown in unconfined aquifer calculation can be explained with given input values -> 2.7 = 3-((3^2)/(2*15)).

FAQ

What is Observed drawdown in unconfined aquifer?

Observed drawdown in unconfined aquifer can be used for when the effect of dewatering of the aquifer can be eliminated and is represented as s' = s-((s^2)/(2*b)) or Possible Drawdown in Confined Aquifer = Observed Drawdown in the Unconfined Aquifer-((Observed Drawdown in the Unconfined Aquifer^2)/(2*Aquifer Thickness)). Observed Drawdown in the Unconfined Aquifer is the reduction in hydraulic head observed at a well in an aquifer & Aquifer Thickness (at Midpoint between Equipotential lines) or otherwise is the thickness of aquifer in which the pore spaces of rock forming the aquifer may or may not be with water.

How to calculate Observed drawdown in unconfined aquifer?

Observed drawdown in unconfined aquifer can be used for when the effect of dewatering of the aquifer can be eliminated is calculated using Possible Drawdown in Confined Aquifer = Observed Drawdown in the Unconfined Aquifer-((Observed Drawdown in the Unconfined Aquifer^2)/(2*Aquifer Thickness)). To calculate Observed drawdown in unconfined aquifer, you need Observed Drawdown in the Unconfined Aquifer (s) & Aquifer Thickness (b). With our tool, you need to enter the respective value for Observed Drawdown in the Unconfined Aquifer & Aquifer Thickness 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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