Home
Contents

ANSDIMAT

Prev Page Next Page
 
ANSDIMAT software
About ANSDIMAT
Main menu
Notation
Main notation
Hydraulic parameters
Special functions
Methods of analysis
Analytical module operation
Data input (Editor)
Table data input
Observation time
Drawdown
Constant rate
Variable rate
Distance to the observation well
Screen level
Well data
Time of recovery measurements
Recovery
Last drawdown
Оbservation well data
Options
Choose conceptual scheme
Test conditions
Diagnostic plot
Plot construction
Choose plot
Select wells
Select time
Plot view
Axis properties
Observation data symbols
Caption and subscription
Basic types of diagnostic graphs
Graphs based on observations in two wells
Some special graphs and graphs of dimensionless parameters
View graphs
Rate plot
Stepwise rate approximation
Viewing data, removing measurements
Saving data
Settings
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 >

Dewatering by abstraction wells

ANSPIT calculates abstraction rates for dewatering wells that are required to achieve dewatering targets (i.e. water level drawdowns on pit walls or other locations). Abstraction rates can be calculated for all input wells or for selected wells only. If a well is not selected, it still operates with a prescribed pumping rate and it is included in drawdown predictions for other wells. Drawdown targets are assigned at the pit center or at specific locations, selected by user. Water level drawdowns are calculated for specified time or period.

 

"Dewatering wells" tab

 

"Dewatering wells" list

Selects abstraction wells, where calculation of pumping rates is required. If well is not checked, it operates with a prescribed pumping rate

"Drawdown target" frame

Time-specific drawdown that needs to be achieved for pit dewatering. Frame is activated when option "Time-constant drawdown" is unchecked. Target drawdown is determined for the specific location (frame "Coordinates")

"Time" text box

Specified time for drawdown target

"Drawdown" text box

Target drawdown (m) for a specified location (see frame "Coordinates"). After value is entered in this field, field "Level" is automatically re-calculated

"Level" text box

Instead of assigning target drawdown, you can enter the target water level that is calculated above the pit  bottom (positive value) or below the pit bottom (negative value). Drawdown will be automatically re-calculated

"Coordinates" frame


"X" and "Y" text box

Coordinates of a drawdown (or water level) target location. By default this location corresponds to the pit center

"Assign to pit centre" option

By default, drawdown target is assigned to the pit center  and the option window is checked. The option should be unchecked if the target location is different from that default. In the latter case drawdown is calculated either for  specified coordinates (text box "X" and "Y") or for "drainage center" that is identified in the graphical window dialog

"Equal abstraction rates for all wells" option

If this option is checked, all calculated abstraction rates for dewatering wells will be equal. With the unchecked option, abstraction rates are inversely proportional to distances between wells and drawdown target locations

"Constant drawdown" option

If this option is unchecked, abstraction rates will be calculated only for specified time (text box "Time" in frame  "Drawdown target"). With the option checked, ANSPIT applies time-variable drawdown targets as specified in the input table (button "Table")

"Table" button

This button is activated if "Constant drawdown" option is checked. It loads the table with time periods and related drawdown targets (see drawdown table description below)

"Run" button

Launches calculations. The process can be aborted by ESC button. When calculation can not be completed,  error message is displayed. Computational problems are often related to high drawdown targets specified over short periods of abstraction. For steady state solutions of leaky aquifer or aquifer with recharge boundary, calculations can not be completed if target drawdown is higher than the maximum achievable drawdown for a conceptual scheme.

When calculation is complete, you will be asked to choose either to stay in the same dialog window or to see results in the tab "Abstraction wells" in the dialog window "Wells and hydrographs"

 

 

Drawdown table

Drawdown table is accessible if "Constant drawdown" option is checked. There are three columns in the table: Period N, Time and Drawdown. Abstraction rates of dewatering wells are calculated for tabulated times and target drawdowns. This table can be filled manually,  from the clipboard or by loading time-series from tab "Time" of the dialog window "Wells and time measurements".

 

"Insert Row" button

Insert a new row in the table

"Delete Row" button

Delete the current row

"Load" button

Load time-series from tab "Time" of the dialog window "Wells and time measurements"

"Drawdown" button

Insert drawdown (from the current position of the cursor to the end of the table)

"Copy" button

Copy the table to the clipboard

"Paste" button

Paste values from the clipboard