Hydrogeologist workbench (ANSQUICK) > Drawdown during aquifer tests

Transient solutions. Press "Steady-state" button to go to steady-state solutions for circular aquifer.

Roots of transcendental equations are calculated in solutions:

1. Pumping well in center of circular aquifer

"Well in center" tab of "Circular aquifer" dialog box.

Explanatory table for tab "Circular aquifer"

"Q, m^3/day" text box	Constant pumping rate of a well
"t, day" text box	Time for which drawdown is calculated
"s, m" text box	Calculated drawdown
"k, m/day" text box	Hydraulic conductivity of aquifer
"a, m^2/day" text box	Hydraulic diffusivity of aquifer
"B, m" text box	Leaky factor
"Leaky" option	Leaky aquifer
"m, m" text box	Aquifer thickness
"R, m" text box	Radius of circular aquifer
"r, m" text box	Distance from the pumping well to an observation well
"Boundary conditions" frame	Boundary conditions (I or II kind)

Equations

Recharge boundary (I kind):

drawdown in observation well in non-leaky aquifer

drawdown in observation well in leaky aquifer

No-flow boundary (II kind):

drawdown in observation well in non-leaky aquifer

drawdown in observation well in leaky aquifer

2. Pumping well is offset from the center of the circular aquifer

"Eccentric well" tab of "Circular aquifer" dialog box.

Explanatory table for tab "Eccentric well"

"Q, m^3/day" text box	Constant pumping rate of a well
"t, day" text box	Time for which drawdown is calculated
"s, m" text box	Calculated drawdown
"k, m/day" text box	Hydraulic conductivity of aquifer
"a, m^2/day" text box	Hydraulic diffusivity of aquifer
"B, m" text box	Leaky factor
"Leaky" option	Leaky aquifer
"m, m" text box	Aquifer thickness
"R, m" text box	Radius of circular aquifer
"r, m" text box	Distance from the pumping well to an observation well
"Lw, m" text box	Distance from pumping well to center of circular aquifer
"Lp, m" text box	Distance from observation well to center of circular aquifer
"Boundary conditions" frame	Boundary conditions (I or II kind)

Equations

Recharge boundary (I kind):

drawdown in observation well in non-leaky aquifer

drawdown in observation well in leaky aquifer

No-flow boundary (II kind):

drawdown in observation well in non-leaky aquifer

drawdown in observation well in leaky aquifer

3. Constant-head test in circular aquifer

"Constant-head test" tab of "Circular aquifer" dialog box.

Explanatory table for tab "Constant-head test"

"sw, m" text box	Constant drawdown in pumping well
"Q, m^3/day" text box	Calculated pumping rate
"t, day" text box	Time for which drawdown and recharge rate are calculated
"s, m" text box	Calculated drawdown in observation well
"k, m/day" text box	Hydraulic conductivity of aquifer
"a, m^2/day" text box	Hydraulic diffusivity of aquifer
"B, m" text box	Leaky factor
"Leaky" option	Leaky aquifer
"m, m" text box	Aquifer thickness
"R, m" text box	Radius of circular aquifer
"rw, m" text box	Pumping well radius
"r, m" text box	Distance from the pumping well to an observation well
"Boundary conditions" frame	Boundary conditions (I or II kind)

Equations

Recharge boundary (I kind):

drawdown in observation well in non-leaky aquifer

pumping rate (non-leaky aquifer)

drawdown in observation well in leaky aquifer

pumping rate (leaky aquifer)

No-flow boundary (II kind):

drawdown in observation well in non-leaky aquifer

pumping rate (non-leaky aquifer)

drawdown in observation well in leaky aquifer

discharge rate (leaky aquifer)

4. Pumping test in circular leaky aquifer (variable level in adjacent aquifer)

"Leaky aquifer" tab of "Circular aquifer" dialog box.

Explanatory table for tab "Leaky aquifer"

"Q, m^3/day" text box	Constant pumping rate of a well
"s, m" and "s2, m" text box	Calculated drawdown in the main aquifer and the adjacent aquifer
"T2, m^2/day" text box	Transmissivity of the adjacent aquifer
"a2, m^2/day" text box	Hydraulic diffusivity of the adjacent aquifer
"k, m/day" text box	Hydraulic conductivity of the main aquifer
"a, m^2/day" text box	Hydraulic diffusivity of the main aquifer
"B, m" text box	Leaky factor
"B2, m" text box	Leaky factor for the adjacent aquifer
"m, m" text box	Main aquifer thickness
"R, m" text box	Radius of circular aquifer
"r, m" text box	Distance from the pumping well to an observation well
"Boundary conditions" frame	Boundary conditions (I or II kind)

Equations

Recharge boundary (I kind):

drawdown for the main aquifer

drawdown for the adjacent aquifer

No-flow boundary (II kind) (parameters of the main aquifer and the adjacent aquifer are equal – T1 = T2, a1 = a2):

Sign «+» for drawdown in the main aquifer, «–» – for drawdown in the adjacent aquifer.

5. Pumping from two aquifers

"Two aquifers" of "Circular aquifer" dialog box.

Explanatory table for tab "Two aquifers"

"Q, m^3/day" and "Q2, m^3/day" text box	Constant pumping rates for bottom aquifer and the upper aquifer
"s, m" and "s2, m" text box	Calculated drawdown in bottom aquifer and the upper aquifer
"k2, m^2/day" text box	Hydraulic conductivity of the upper aquifer
"a2, m^2/day" text box	Hydraulic diffusivity of the upper aquifer
"k, m/day" text box	Hydraulic conductivity of bottom aquifer
"a, m^2/day" text box	Hydraulic diffusivity of bottom aquifer
"B, m" text box	Leaky factor
"B2, m" text box	Leaky factor for the upper aquifer
"m, m" text box	Bottom aquifer thickness
"m2, m" text box	Upper aquifer thickness
"R, m" text box	Radius of circular aquifer
"r, m" text box	Distance from the pumping well to an observation well
"Boundary conditions" frame	Boundary conditions (I or II kind)

Equations

Recharge boundary (I kind):

No-flow boundary (II kind) (parameters of the main aquifer and the adjacent aquifer are equal – T1 = T2, a1 = a2):

Sign «+» for drawdown in bottom aquifer, «–» – for drawdown in the upper aquifer.

ANSQUICK > Drawdown during aquifer tests >

Circular aquifer

ANSQUICK > Drawdown during aquifer tests >

Circular aquifer