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ANSDIMAT software
About ANSDIMAT
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Last drawdown
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Choose conceptual scheme
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Some special graphs and graphs of dimensionless parameters
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Aquifer tests analysis
Matching parameters (solving direct problem)
Value assignment
Theoretical curve features
Parameter calculation
Data correction
Graphical analysis
Strait-line method
Slug test
Method of type curve
Search for strait-line segment
Bisecting line method
Inverse problem solution
Less square method
UCODE
Conceptual schemes
Confined aquifer
Infinite aquifer
One well pumped at a constant rate
Several wells pumped at a constant rate
One well pumped at a variable rate
Several wells pumped at a variable rate
Semiinfinite aquifer
Recharge boundary
One well pumped at a constant rate
Several wells pumped at a constant rate
One well pumped at a variable rate
Several wells pumped at a variable rate
No-flow boundary
One well pumped at a constant rate
Several wells pumped at a constant rate
One well pumped at a variable rate
Several wells pumped at a variable rate
Bounded (strip) aquifer
Recharge boundaries
One well pumped at a constant rate
Several wells pumped at a constant rate
One well pumped at a variable rate
Several wells pumped at a variable rate
No-flow boundaries
One well pumped at a constant rate
Several wells pumped at a constant rate
One well pumped at a variable rate
Several wells pumped at a variable rate
Recharge and no-flow boundaries
One well pumped at a constant rate
Several wells pumped at a constant rate
One well pumped at a variable rate
Several wells pumped at a variable rate
Point source
Aquifer of infinite extent and thickness
One well pumped at a constant rate
Several wells pumped at a constant rate
Several wells pumped at a variable rate
Semiinfinite aquifer
Recharge boundary
One well pumped at a constant rate
Several wells pumped at a variable rate
No-flow boundary
One well pumped at a constant rate
Several wells pumped at a variable rate
Bounded aquifer
Recharge boundaries
One well pumped at a constant rate
Several wells pumped at a variable rate
No-flow boundaries
One well pumped at a constant rate
Several wells pumped at a variable rate
Recharge and no-flow boundaries
One well pumped at a constant rate
Several wells pumped at a variable rate
Linear source
Aquifer of infinite extent and thickness
One well pumped at a constant rate
Several wells pumped at a variable rate
Semiinfinite aquifer
Recharge boundary
One well pumped at a constant rate
Several wells pumped at a variable rate
No-flow boundary
One well pumped at a constant rate
Several wells pumped at a variable rate
Bounded aquifer
Recharge boundaries
One well pumped at a constant rate
Several wells pumped at a variable rate
No-flow boundaries
One well pumped at a constant rate
Several wells pumped at a variable rate
Recharge and no-flow boundaries
One well pumped at a constant rate
Several wells pumped at a variable rate
Unconfined aquifer
Aquifer of infinite lateral extent
One well pumped at a constant rate
Bounded aquifers. Several wells pumped at a variable rate
Pumping
Leaky aquifer
Constant level in the adjacent aquifer
Infinite leaky aquifer
One well pumped at a constant rate
Several wells pumped at a variable rate
Bounded leaky aquifer. Several wells pumped at a variable rate
Pumping
Alternating water level in the adjacent aquifer
One well pumped at a constant rate
Several wells pumped at a variable rate
Conceptual scheme accounting for aquitard storage
One well pumped at a constant rate
Several wells pumped at a variable rate
Leaky aquifer anisitropic on the vertical plane
One well pumped at a constant rate
Several wells pumped at a variable rate
Two-layer aquifer
One well pumped at a constant rate
Several wells pumped at a variable rate
Stratified aquifer systems
Three-layer aquifer system
One well pumped at a constant rate
Two-layer aquifer system
One well pumped at a constant rate
Arealy heterogeneous aquifer
One well pumped at a constant rate
Several wells pumped at a variable rate
Pumping near river
One well pumped at a constant rate
Several wells pumped at a variable rate
Sloping aquifer
One well pumped at a constant rate
Fracture-porous media
Moench’s solutions
Vertical fracture
Horizontal fracture
Constant-head test
One well pumped at a constant drawdown
Slug test
Cooper's solution, Picking's solution
Bouwer-Rice's solution
Hvorslev's solutions
AMWELLS
Starting a new model
Modeling environment
Model size and dimensions
Plot scale
Model boundaries
Wells and time measurements
Well system design
Variable production rate
Model parameters
Hydrograph
Piezometric head and drawdown maps
Plot
Distance measure tool
Background maps
Model grid mode
Classes for map
Trace selected range
Animation
3-D View and animation
Plot profiles
Export to ANSDIMAT
Wellhead Protection Areas (WHPA)
Pit dewatering
Pit layout
Dewatering by abstraction wells
Dewatering by in-pit sumps
Pit Inflow
Model
Model creation
Model editing
Graphic editor
Modify values
Parameter selection
Plot construction
Grouping
Measuring distance
Legend creation
Heterogeneity zones (MODFE)
Generate the model grid (MODFE)
Generate the model grid (RADFLOW)
Input parameters
Entering the pumping well
Running MODFE program
Calculation parameters
Time parameters
Running RADFLOW program
Calculation parameters
Viewing results (postprocessor)
Load calculation results
Animation

AMWELLS > Pit dewatering >

Pit Inflow

Calculations for open pits inflow are based on published analytical solutions for the following hydrogeological conceptual schemes:

·Confined aquifer;

·Unconfined aquifer;

·Confined-unconfined aquifer; and

·Leaky aquifer

Most schemes account for I-st or II-nd types of boundary impacts. The aquifer can be modelled as infinite, bounded, stripped or radial (circle-bounded).

The calculations are performed from the graphical window dialog "Pit Inflow". The dialog contains pit sketches in plan and profile as well as required fields for inflow calculations. The module will determine drawdown in a pit, if pit inflow is entered. When entering values in text box "Q, m^3/d" and "t, d"), you can convert inflow rate and time in other units using SHIFT (or CTRL) + MB.

To access this module, use "Model > Quick estimates> Pit inflow" or button "Quick estimates of pit inflow" in tab "In-Pit sumps" of dialog window "Pit" (use button "Pit" on a dialog window AMWELLS).

 

a  b

c

Dialog window "Pit inflow"

 

"Q, m^3/d" text box

Information field showing the result of pit inflow calculations. If pit inflow is entered manually in this field, the calculations are conducted for drawdown

"so, m" text box

Drawdown in the pit (the same drawdown is assumed for the whole pit area)

"ε, m/d" text box

Recharge rate. This field is required for calculation of Radius of influence using the formula with recharge input

"Q', m^3/d" text box

Additional inflow. Use for circle aquifer for Neumann boundary

"s, m" text box

Drawdown in an observation well. This field is required for calculation of Radius of influence using the formula with drawdown in the observation well

"k, m/d" text box

Hydraulic conductivity

"B, m" text box

Leakage factor that is required for the "leaky aquifer scheme

"H, m" text box

Hydraulic head that is calculated in meters above the aquifer bottom. This field is required for calculations of confined-unconfined hydrodynamic conditions

"m, m" text box

Thickness of confined aquifer or initial saturated thickness of unconfined aquifer

"ro, m" text box

Effective radius of the pit. Can be entered manually or calculated (see frame "Pit radius")

"R, m" text box

Effective radius of the pit. Can be entered manually or calculated (see frame "Radius of influence"). This field is required for infinite aquifers. For aquifer with circular boundary the entered value should correspond to the aquifer radius

"r, m" text box

Distance from the pit center to an observation well. This field is required for calculations of Radius of influence using the formula with drawdown in an observation well

"L1, m" text box

Distance from the pit center to the aquifer boundary (for aquifers with one boundary) or to the 1-st boundary (for aquifers with two boundaries)

"L" text box

Width of strip aquifer

"L2, m" text box

Distance from the pit center to the 2-nd aquifer boundary (for aquifers with two boundaries) or to the center of the aquifer (for aquifer with radial boundary)

"Conceptual scheme" list

Conceptual scheme of the aquifer (i.e. confined, unconfined, confined-unconfined or leaky aquifer)

"Boundaries" list

Hydrodynamic boundaries (infinite aquifer, stripped aquifer, square aquifer etc.) and boundary types (Neumann or Dirichlet)

"Pit radius (ro)" frame

Options to calculate pit radius using pit area, length and perimeter

"Area", "Perimeter" text box

Pit area (perimeter) that is required for calculations of Radius of influence for the non-elongated pits (ratio Width/Length > 0.5)

"Length", "W / L" text box

Pit length and its ratio to pit width. These fields are required for elongated pits with Width/Length ratio less than 0.5

"Radius of influence" list

Select method of calculation for Radius of influence: manually, using formula with recharge input, water level in observation well or storage properties

"Transient conditions" frame

This field is required when Radius of influence is changing with time and calculated using hydrraulic conductivity (text box "a")  and time (text box "t"). Use this parameter for infinite aquifers and also for aquifers with boundaries that can not be modelled in steady state

 

 

Analytical solutions for calculations of pit inflow (Q) and pit drawdown (so) for confined, unconfined and confined-unconfined aquifers

Boundaries

Confined aquifer

Unconfined aquifer

Confined-unconfined aquifer

Unlimited aquifer (radius of influence is required)

Radius of influence can be estimated outside of the module and entered manually. Other option is to use in-built formulas of the dialogue window:

1) general formula for transient groundwater flow:

2) general formula with recharge:

Unlimited aquifer(drawdown in observation well is required )

One boundary of the I-st type (Dirichlet)

One boundary of the II-nd type (Neumann)

Strip aquifer with two Dirichlet boundaries

Strip aquifer with two Neumann boundaries

Strip aquifer with one  Neumann boundary and one Dirichlet boundary

Square aquifer with Dirichlet boundaries

Square aquifer with Neumann boundaries

Square aquifer with Dirichlet and Neumann boundaries

Aquifer with radial boundary (Dirichlet)

Aquifer with radial boundary (Neumann)

 

Analytical solutions for calculations of pit inflow (Q) and pit drawdown (so) for leaky aquifers

 

Pit inflow is calculated using formula for unlimited aquifer and drawdown formulas for each type of boundary

 

Boundaries

Leaky aquifer formula

Unlimited aquifer

 

One boundary of the I-st type (Dirichlet)

One boundary of the II-nd type (Neumann)

Strip aquifer with two Dirichlet boundaries

Strip aquifer with two Neumann boundaries

Strip aquifer with one  Neumann boundary and one Dirichlet boundary

Square aquifer with Dirichlet boundaries

Square aquifer with Neumann boundaries

Square aquifer with Dirichlet boundaries

Aquifer with radial boundary (Dirichlet)

Aquifer with radial boundary (Neumann)