Drawdown given Piezometric Head Calculator

✖Initial constant piezometric head is a specific measurement of liquid pressure above a vertical datum.ⓘ Initial constant Piezometric Head [H]			+10% -10%
✖Drawdown at time t refers to the lowering of the surface elevation of a body of water, the water table, the piezometric surface, or the water surface of a well, as a result of the withdrawal of water.ⓘ Drawdown at time t [h]			+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).ⓘ Drawdown given Piezometric Head [s']

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Formula

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Drawdown given Piezometric Head

Formula

`"s'" = "H"-"h"`

Example

`"0.2m"="10.0m"-"9.8m"`

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Drawdown given Piezometric Head Solution

STEP 0: Pre-Calculation Summary

Formula Used

Possible Drawdown in Confined Aquifer = Initial constant Piezometric Head-Drawdown at time t
s' = H-h
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).
Initial constant Piezometric Head - (Measured in Meter) - Initial constant piezometric head is a specific measurement of liquid pressure above a vertical datum.
Drawdown at time t - (Measured in Meter) - Drawdown at time t refers to the lowering of the surface elevation of a body of water, the water table, the piezometric surface, or the water surface of a well, as a result of the withdrawal of water.

STEP 1: Convert Input(s) to Base Unit

Initial constant Piezometric Head: 10 Meter --> 10 Meter No Conversion Required
Drawdown at time t: 9.8 Meter --> 9.8 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

s' = H-h --> 10-9.8

Evaluating ... ...

s' = 0.199999999999999

STEP 3: Convert Result to Output's Unit

0.199999999999999 Meter --> No Conversion Required

FINAL ANSWER

0.199999999999999 ≈ 0.2 Meter <-- Possible Drawdown in Confined Aquifer

(Calculation completed in 00.020 seconds)

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Created by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

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< 11 Unsteady Flow in a Confined Aquifer Calculators

Equation for Drawdown

Go Total Drawdown = (Discharge/(4*pi*Transmissivity))*ln((2.2*Transmissivity*Time Period)/(Distance from Pumping Well^2*Storage Coefficient))

Drawdown at Time Interval 't1'

Go Drawdown at time interval t1 = Drawdown at time interval t2-((Discharge/(4*pi*Transmissivity))*ln(Time of Drawdown (t2)/Time of Drawdown (t1)))

Drawdown at Time Interval 't2'

Go Drawdown at time interval t2 = ((Discharge/(4*pi*Transmissivity))*ln(Time of Drawdown (t2)/Time of Drawdown (t1)))+Drawdown at time interval t1

Equation for Well Function series to number of 4 digits

Go Well Function of u = -0.577216-ln(Well Parameter)+Well Parameter-(Well Parameter^2/2.2!)+(Well Parameter^3/3.3!)

Equation for Well Parameter

Go Well Parameter = (Distance from Pumping Well^2*Storage Coefficient)/(4*Transmissivity*Time Period)

Distance from Pumping Well given Storage Coefficient

Go Distance from Pumping Well = sqrt((2.25*Transmissivity*Starting Time/Storage Coefficient))

Initial Time given Pumping Well along with Storage Coefficient

Go Starting Time = (Storage Coefficient*Distance from Pumping Well^2)/(2.25*Transmissivity)

Transmissivity about given storage coefficient

Go Transmissivity = (Storage Coefficient*Distance from Pumping Well^2)/(2.25*Starting Time)

Equation for Storage Coefficient

Go Storage Coefficient = 2.25*Transmissivity*Starting Time/Distance from Pumping Well^2

Initial Constant Piezometric Head given drawdown

Go Initial constant Piezometric Head = Possible Drawdown in Confined Aquifer+Drawdown at time t

Drawdown given Piezometric Head

Go Possible Drawdown in Confined Aquifer = Initial constant Piezometric Head-Drawdown at time t

Drawdown given Piezometric Head Formula

Possible Drawdown in Confined Aquifer = Initial constant Piezometric Head-Drawdown at time t
s' = H-h

What is Drawdown in Hydrology?

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

How to Calculate Drawdown given Piezometric Head?

Drawdown given Piezometric Head calculator uses Possible Drawdown in Confined Aquifer = Initial constant Piezometric Head-Drawdown at time t to calculate the Possible Drawdown in Confined Aquifer, The Drawdown given Piezometric Head is defined as the change in groundwater level due to an applied stress at a point distance from the pumping well. Possible Drawdown in Confined Aquifer is denoted by s' symbol.

How to calculate Drawdown given Piezometric Head using this online calculator? To use this online calculator for Drawdown given Piezometric Head, enter Initial constant Piezometric Head (H) & Drawdown at time t (h) and hit the calculate button. Here is how the Drawdown given Piezometric Head calculation can be explained with given input values -> 0.2 = 10-9.8.

FAQ

What is Drawdown given Piezometric Head?

The Drawdown given Piezometric Head is defined as the change in groundwater level due to an applied stress at a point distance from the pumping well and is represented as s' = H-h or Possible Drawdown in Confined Aquifer = Initial constant Piezometric Head-Drawdown at time t. Initial constant piezometric head is a specific measurement of liquid pressure above a vertical datum & Drawdown at time t refers to the lowering of the surface elevation of a body of water, the water table, the piezometric surface, or the water surface of a well, as a result of the withdrawal of water.

How to calculate Drawdown given Piezometric Head?

The Drawdown given Piezometric Head is defined as the change in groundwater level due to an applied stress at a point distance from the pumping well is calculated using Possible Drawdown in Confined Aquifer = Initial constant Piezometric Head-Drawdown at time t. To calculate Drawdown given Piezometric Head, you need Initial constant Piezometric Head (H) & Drawdown at time t (h). With our tool, you need to enter the respective value for Initial constant Piezometric Head & Drawdown at time t 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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