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Drawdown in Aquifer given Well Efficiency Formula

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The Change in Drawdown refers to the term applied to the maximum lowering of the groundwater table caused by pumping or artesian flow. Check FAQs

s = E \cdot s t

s - Change in Drawdown?E - Well Efficiency?s_t - Drawdown Inside the Well?

Drawdown in Aquifer given Well Efficiency Example

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Here is how the Drawdown in Aquifer given Well Efficiency equation looks like with Values.

Here is how the Drawdown in Aquifer given Well Efficiency equation looks like with Units.

Here is how the Drawdown in Aquifer given Well Efficiency equation looks like.

9.99 = 1.11 \cdot 9

9.99m = 1.11 \cdot 9m

9.99 = 1.11 \cdot 9

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Drawdown in Aquifer given Well Efficiency Solution

Follow our step by step solution on how to calculate Drawdown in Aquifer given Well Efficiency?

FIRST Step Consider the formula

s = E \cdot s t

Next Step Substitute values of Variables

∴

s = 1.11 \cdot 9m

Next Step Prepare to Evaluate

∴

s = 1.11 \cdot 9

LAST Step Evaluate

∴

s = 9.99m

Drawdown in Aquifer given Well Efficiency Formula Elements

Variables

Change in Drawdown

The Change in Drawdown refers to the term applied to the maximum lowering of the groundwater table caused by pumping or artesian flow.

Symbol: s

Measurement: LengthUnit: m

Note: Value can be positive or negative.

Formulas to find Change in Drawdown

Well Efficiency

The Well Efficiency refers to the ratio of the drawdown in the aquifer at the radius of the pumping well to the drawdown inside the well.

Symbol: E

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Well Efficiency

Drawdown Inside the Well

The Drawdown Inside the Well refers to the radius of the pumping well is a change in groundwater level due to an applied stress.

Symbol: s_t

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Drawdown Inside the Well

Other formulas in Well Efficiency category

Go Specific Capacity

K s = \frac{q}{s t}

Go Pumping Rate given Specific Capacity

q = K s \cdot s t

Go Drawdown given Specific Capacity

s t = \frac{q}{K s}

Go Well Efficiency

E = (\frac{s}{s t})

How to Evaluate Drawdown in Aquifer given Well Efficiency?

Drawdown in Aquifer given Well Efficiency evaluator uses Change in Drawdown = Well Efficiency*Drawdown Inside the Well to evaluate the Change in Drawdown, The Drawdown in Aquifer given Well Efficiency formula is defined as the product of well efficiency and drawdown inside the well which is the reduction in hydraulic head observed at a well in an aquifer, (Well efficiency is not in Percentage). Change in Drawdown is denoted by s symbol.

How to evaluate Drawdown in Aquifer given Well Efficiency using this online evaluator? To use this online evaluator for Drawdown in Aquifer given Well Efficiency, enter Well Efficiency (E) & Drawdown Inside the Well (s_t) and hit the calculate button.

FAQs on Drawdown in Aquifer given Well Efficiency

What is the formula to find Drawdown in Aquifer given Well Efficiency?

The formula of Drawdown in Aquifer given Well Efficiency is expressed as Change in Drawdown = Well Efficiency*Drawdown Inside the Well. Here is an example- 9.99 = 1.11*9.

How to calculate Drawdown in Aquifer given Well Efficiency?

With Well Efficiency (E) & Drawdown Inside the Well (s_t) we can find Drawdown in Aquifer given Well Efficiency using the formula - Change in Drawdown = Well Efficiency*Drawdown Inside the Well.

Can the Drawdown in Aquifer given Well Efficiency be negative?

Yes, the Drawdown in Aquifer given Well Efficiency, measured in Length can be negative.

Which unit is used to measure Drawdown in Aquifer given Well Efficiency?

Drawdown in Aquifer given Well Efficiency is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Drawdown in Aquifer given Well Efficiency can be measured.

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