Change in Radial Distance Calculator

✖The coefficient of permeability (K) is the velocity in meters or centimetres per second of water through soils.ⓘ Coefficient of Permeability [K]			+10% -10%
✖Change in the piezometric head with respect to the radial distance.ⓘ Change in the piezometric head [dh]			+10% -10%
✖Velocity of Flow at Radial Distance by Darcy's law.ⓘ Velocity of Flow at Radial Distance [V_r]			+10% -10%

✖Change in Radial Distance with respect to the Piezometric Head.ⓘ Change in Radial Distance [dr]

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Formula

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Change in Radial Distance

Formula

`"dr" = "K"*"dh"/"V"_{"r"}`

Example

`"0.1875m"="3.0cm/s"*"1.25m"/"20cm/s"`

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Change in Radial Distance Solution

STEP 0: Pre-Calculation Summary

Formula Used

Change in Radial Distance = Coefficient of Permeability*Change in the piezometric head/Velocity of Flow at Radial Distance
dr = K*dh/V_r
This formula uses 4 Variables

Variables Used

Change in Radial Distance - (Measured in Meter) - Change in Radial Distance with respect to the Piezometric Head.
Coefficient of Permeability - (Measured in Meter per Second) - The coefficient of permeability (K) is the velocity in meters or centimetres per second of water through soils.
Change in the piezometric head - (Measured in Meter) - Change in the piezometric head with respect to the radial distance.
Velocity of Flow at Radial Distance - (Measured in Meter per Second) - Velocity of Flow at Radial Distance by Darcy's law.

STEP 1: Convert Input(s) to Base Unit

Coefficient of Permeability: 3 Centimeter per Second --> 0.03 Meter per Second (Check conversion here)
Change in the piezometric head: 1.25 Meter --> 1.25 Meter No Conversion Required
Velocity of Flow at Radial Distance: 20 Centimeter per Second --> 0.2 Meter per Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

dr = K*dh/V_r --> 0.03*1.25/0.2

Evaluating ... ...

dr = 0.1875

STEP 3: Convert Result to Output's Unit

0.1875 Meter --> No Conversion Required

FINAL ANSWER

0.1875 Meter <-- Change in Radial Distance

(Calculation completed in 00.004 seconds)

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Created by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

Mithila Muthamma PA has created this Calculator and 2000+ more calculators!

Verified by Chandana P Dev

NSS College of Engineering (NSSCE), Palakkad

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< 10+ Steady Flow into a Well Calculators

Thiem's equilibrium equation for steady flow in confined aquifer

Go Steady Flow in a Confined Aquifer = 2*pi*Coefficient of Permeability*Width of Aquifer*(Piezometric Head at Radial Distance r2-Piezometric Head at Radial Distance r1)/ln(Radial Distance at Observation Well 2/Radial Distance at Observation Well 1)

Equilibrium Equation for Flow in Confined Aquifer at Observation Well

Go Discharge entering cylindrical surface into Well = (2*pi*Transmissivity*(Piezometric Head at Radial Distance r2-Piezometric Head at Radial Distance r1))/ln(Radial Distance at Observation Well 2/Radial Distance at Observation Well 1)

Transmissivity when Discharge and Drawdowns are considered

Go Transmissivity = Steady Flow in a Confined Aquifer*ln(Radial Distance at Observation Well 2/Radial Distance at Observation Well 1)/(2*pi*(Drawdown at the Start of Recuperation-Drawdown at a Time))

Discharge Observed at Edge of Zone of Influence

Go Discharge entering cylindrical surface into Well = 2*pi*Transmissivity*Possible Drawdown in Confined Aquifer/ln(Radial Distance at Observation Well 2/Radial Distance at Observation Well 1)

Discharge entering cylindrical surface to well discharge

Go Discharge entering cylindrical surface into Well = (2*pi*Radial Distance*Width of Aquifer)*(Coefficient of Permeability*(Change in the piezometric head/Change in Radial Distance))

Transmissivity when discharge at edge of zone of influence

Go Transmissivity = (Steady Flow in a Confined Aquifer*ln(Radial Distance at Observation Well 2/Radial Distance at Observation Well 1))/(2*pi*Possible Drawdown in Confined Aquifer)

Velocity of flow by Darcy's Law at Radical Distance

Go Velocity of Flow at Radial Distance = Coefficient of Permeability*(Change in the piezometric head/Change in Radial Distance)

Change in Piezometric Head

Go Change in the piezometric head = Velocity of Flow at Radial Distance*Change in Radial Distance/Coefficient of Permeability

Change in Radial Distance

Go Change in Radial Distance = Coefficient of Permeability*Change in the piezometric head/Velocity of Flow at Radial Distance

Cylindrical Surface through which Velocity of Flow Occurs

Go Surface through which the Velocity of Flow Occurs = 2*pi*Radial Distance*Width of Aquifer

Change in Radial Distance Formula

Change in Radial Distance = Coefficient of Permeability*Change in the piezometric head/Velocity of Flow at Radial Distance
dr = K*dh/V_r

What is Coefficient of Permeability?

The Coefficient of Permeability of a soil describes how easily a liquid will move through a soil. It is also commonly referred to as the hydraulic conductivity of a soil. This factor can be affected by the viscosity, or thickness(fluidity) of a liquid and its density.

How to Calculate Change in Radial Distance?

Change in Radial Distance calculator uses Change in Radial Distance = Coefficient of Permeability*Change in the piezometric head/Velocity of Flow at Radial Distance to calculate the Change in Radial Distance, Change in Radial Distance is the maximum distance at which the drawdowns can be detected with the usual measure devices to detect the flow rate. Change in Radial Distance is denoted by dr symbol.

How to calculate Change in Radial Distance using this online calculator? To use this online calculator for Change in Radial Distance, enter Coefficient of Permeability (K), Change in the piezometric head (dh) & Velocity of Flow at Radial Distance (V_r) and hit the calculate button. Here is how the Change in Radial Distance calculation can be explained with given input values -> 0.1875 = 0.03*1.25/0.2.

FAQ

What is Change in Radial Distance?

Change in Radial Distance is the maximum distance at which the drawdowns can be detected with the usual measure devices to detect the flow rate and is represented as dr = K*dh/V_r or Change in Radial Distance = Coefficient of Permeability*Change in the piezometric head/Velocity of Flow at Radial Distance. The coefficient of permeability (K) is the velocity in meters or centimetres per second of water through soils, Change in the piezometric head with respect to the radial distance & Velocity of Flow at Radial Distance by Darcy's law.

How to calculate Change in Radial Distance?

Change in Radial Distance is the maximum distance at which the drawdowns can be detected with the usual measure devices to detect the flow rate is calculated using Change in Radial Distance = Coefficient of Permeability*Change in the piezometric head/Velocity of Flow at Radial Distance. To calculate Change in Radial Distance, you need Coefficient of Permeability (K), Change in the piezometric head (dh) & Velocity of Flow at Radial Distance (V_r). With our tool, you need to enter the respective value for Coefficient of Permeability, Change in the piezometric head & Velocity of Flow at Radial Distance 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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