Formation Constant given Drawdown Calculator

✖Discharge is the rate of flow of a liquid.ⓘ Discharge [Q]			+10% -10%
✖Well Function of u is the data plot of drawdown versus time (or drawdown versus t/rz) is matched to the type curve of W(u) versus 1/u.ⓘ Well Function of u [W_u]			+10% -10%
✖The Total Drawdown in Well 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.ⓘ Total Drawdown in Well [s_t]			+10% -10%

✖Formation Constant for Unsteady Flow is an equilibrium constant for the formation of a complex in solution.ⓘ Formation Constant given Drawdown [F_c]

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Formula

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Formation Constant given Drawdown

Formula

`"F"_{"c"} = ("Q"*"W"_{"u"})/(4*pi*"s"_{"t"})`

Example

`"0.808574m²/s"=("1.01m³/s"*"8.35")/(4*pi*"0.83m")`

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Formation Constant given Drawdown Solution

STEP 0: Pre-Calculation Summary

Formula Used

Formation Constant for Unsteady Flow = (Discharge*Well Function of u)/(4*pi*Total Drawdown in Well)
F_c = (Q*W_u)/(4*pi*s_t)
This formula uses 1 Constants, 4 Variables

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Formation Constant for Unsteady Flow - (Measured in Square Meter per Second) - Formation Constant for Unsteady Flow is an equilibrium constant for the formation of a complex in solution.
Discharge - (Measured in Cubic Meter per Second) - Discharge is the rate of flow of a liquid.
Well Function of u - Well Function of u is the data plot of drawdown versus time (or drawdown versus t/rz) is matched to the type curve of W(u) versus 1/u.
Total Drawdown in Well - (Measured in Meter) - The Total Drawdown in Well 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.

STEP 1: Convert Input(s) to Base Unit

Discharge: 1.01 Cubic Meter per Second --> 1.01 Cubic Meter per Second No Conversion Required
Well Function of u: 8.35 --> No Conversion Required
Total Drawdown in Well: 0.83 Meter --> 0.83 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

F_c = (Q*W_u)/(4*pi*s_t) --> (1.01*8.35)/(4*pi*0.83)

Evaluating ... ...

F_c = 0.808574224437048

STEP 3: Convert Result to Output's Unit

0.808574224437048 Square Meter per Second --> No Conversion Required

FINAL ANSWER

0.808574224437048 ≈ 0.808574 Square Meter per Second <-- Formation Constant for Unsteady Flow

(Calculation completed in 00.004 seconds)

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Birsa Institute of Technology (BIT), Sindri

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< 7 Formation Constant Calculators

Constant dependent on Well Function given Formation Constant S

Go Well Function Constant = Formation Constant for Unsteady Flow/((4*Formation Constant T*Time in Days)/(Radial Distance)^2)

Formation Constant T given Formation Constant S

Go Formation Constant T = Formation Constant for Unsteady Flow/((4*Well Function Constant*Time in Days)/(Radial Distance)^2)

Formation Constant S

Go Formation Constant for Unsteady Flow = (4*Well Function Constant*Formation Constant T*Time in Days)/(Radial Distance)^2

Formation Constant given Drawdown

Go Formation Constant for Unsteady Flow = (Discharge*Well Function of u)/(4*pi*Total Drawdown in Well)

Formation Constant S given Radial Distance

Go Formation Constant S given Radial Distance = (2.25*Formation Constant T*Time in Days)/(Radial Distance)^2

Formation Constant T given Radial Distance

Go Formation Constant T = Formation Constant for Unsteady Flow/((2.25*Time in Days)/(Radial Distance)^2)

Formation Constant T given Change in Drawdown

Go Formation Constant T given Change in Drawdown = (2.303*Discharge)/(4*pi*Change in Drawdown)

Formation Constant given Drawdown Formula

Formation Constant for Unsteady Flow = (Discharge*Well Function of u)/(4*pi*Total Drawdown in Well)
F_c = (Q*W_u)/(4*pi*s_t)

What is Drawdown in Well?

Drawdown is a change in groundwater level due to an applied stress, caused by events such as: Pumping from a well. Pumping from a neighbouring well. Intensive water taking from local area.

How to Calculate Formation Constant given Drawdown?

Formation Constant given Drawdown calculator uses Formation Constant for Unsteady Flow = (Discharge*Well Function of u)/(4*pi*Total Drawdown in Well) to calculate the Formation Constant for Unsteady Flow, The Formation Constant given Drawdown is defined as the value of formation constant when we have prior information of other parameters used. Formation Constant for Unsteady Flow is denoted by F_c symbol.

How to calculate Formation Constant given Drawdown using this online calculator? To use this online calculator for Formation Constant given Drawdown, enter Discharge (Q), Well Function of u (W_u) & Total Drawdown in Well (s_t) and hit the calculate button. Here is how the Formation Constant given Drawdown calculation can be explained with given input values -> 6.644719 = (1.01*8.35)/(4*pi*0.83).

FAQ

What is Formation Constant given Drawdown?

The Formation Constant given Drawdown is defined as the value of formation constant when we have prior information of other parameters used and is represented as F_c = (Q*W_u)/(4*pi*s_t) or Formation Constant for Unsteady Flow = (Discharge*Well Function of u)/(4*pi*Total Drawdown in Well). Discharge is the rate of flow of a liquid, Well Function of u is the data plot of drawdown versus time (or drawdown versus t/rz) is matched to the type curve of W(u) versus 1/u & The Total Drawdown in Well 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.

How to calculate Formation Constant given Drawdown?

The Formation Constant given Drawdown is defined as the value of formation constant when we have prior information of other parameters used is calculated using Formation Constant for Unsteady Flow = (Discharge*Well Function of u)/(4*pi*Total Drawdown in Well). To calculate Formation Constant given Drawdown, you need Discharge (Q), Well Function of u (W_u) & Total Drawdown in Well (s_t). With our tool, you need to enter the respective value for Discharge, Well Function of u & Total Drawdown in Well and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Formation Constant for Unsteady Flow?

In this formula, Formation Constant for Unsteady Flow uses Discharge, Well Function of u & Total Drawdown in Well. We can use 1 other way(s) to calculate the same, which is/are as follows -

Formation Constant for Unsteady Flow = (4*Well Function Constant*Formation Constant T*Time in Days)/(Radial Distance)^2

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