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Well Efficiency Formula

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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. Check FAQs

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

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

Well Efficiency Example

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With units

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Here is how the Well Efficiency equation looks like with Values.

Here is how the Well Efficiency equation looks like with Units.

Here is how the Well Efficiency equation looks like.

1.11 = (\frac{9.99}{9})

1.11 = (\frac{9.99m}{9m})

1.11 = (\frac{9.99}{9})

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Well Efficiency Solution

Follow our step by step solution on how to calculate Well Efficiency?

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

E = (\frac{9.99m}{9m})

Next Step Prepare to Evaluate

∴

E = (\frac{9.99}{9})

LAST Step Evaluate

∴

E = 1.11

Well Efficiency Formula Elements

Variables

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

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

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 Drawdown in Aquifer given Well Efficiency

s = E \cdot s t

How to Evaluate Well Efficiency?

Well Efficiency evaluator uses Well Efficiency = (Change in Drawdown/Drawdown Inside the Well) to evaluate the Well Efficiency, The Well Efficiency formula is defined as the ratio of the drawdown in the aquifer at the radius of the pumping well to the drawdown inside the well, (Well efficiency is not in Percentage). Well Efficiency is denoted by E symbol.

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

FAQs on Well Efficiency

What is the formula to find Well Efficiency?

The formula of Well Efficiency is expressed as Well Efficiency = (Change in Drawdown/Drawdown Inside the Well). Here is an example- 1.11 = (9.99/9).

How to calculate Well Efficiency?

With Change in Drawdown (s) & Drawdown Inside the Well (s_t) we can find Well Efficiency using the formula - Well Efficiency = (Change in Drawdown/Drawdown Inside the Well).

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