Boreholes

Input/edit borehole data.

Icon	Command	Shortcut Key	Toolbar
	WATERDATABOREHOLES

This function allows you to input and edit the borehole data.

Procedure

The borehole window displays with four tabbed pages.

Borehole

The borehole data displays.

Option	Description
Name	Optional descriptive borehole name. Typically, it corresponds to borehole name as stated in the hydrogeological report.
ID Number	Automatically generated unique identifier.
Y Coordinate	Y coordinate of borehole.
X Coordinate	X coordinate of borehole.
Ground Elevation	Ground level at borehole.
Depths (measured from ground level)	All depths are measured from the ground level, as common in hydrogeological reports.
Water at rest	Essential value when using drawdown curve to accurately model dynamic water levels, otherwise optional.
Water while operating	Dynamic water level corresponding to the discharge equal to recommended yield.
Pump intake	Depth to pump intake.
Recommended yield (l/s)	Yield as given in the hydrogeological report.

Drawdown Curve

Using a drawdown curve significantly increases accuracy, but requires additional info which is not always available to design engineers. Therefore, the drawdown curve is an optional but highly recommended feature.

The program implements the Jacob equation to determine the drawdown for a given flow:

s = B * q + C * q2

Where

s = Drawdown

q = Borehole discharge

B = Linear aquifer plus linear well loss coefficient

C = Non-linear well loss coefficient

Coefficients B and C are calculated using least square regression on supplied points.

Two points on the curve originate from the first page:

Water depth at rest.
Depth while operating at recommended yield.

Up to five additional points can be appended.

Equipment

Specify the borehole pump equipment.

Option	Description
Column and Shaft
Length	Length of a column, from pump flange to connection with borehole installation above ground level. Use … to enter an approximate value. Accurate length can be determined from the detail drawing.
Column diameter	Internal diameter of the column. This is the diameter of the pump discharge pipe, not the borehole sleeve.
Shaft diameter	Shaft diameter is typically given in the pump catalogue. Leave at zero when shaft is absent.
Roughness	Roughness of the column wall.
Minor losses coefficient	Sum of minor loss coefficients due to foot valve, check or isolating valve, elbows, reducers and other elements of the entire borehole installation.
Pump
Fixed delivery	Select this option for preliminary design, or to obtain the approximate pump duty point prior to pump selection. When using the Fixed delivery option, select delivery based on water requirements and recommended borehole yield. Use … to make delivery equal to yield.
Model	Pump designation as specified in the catalogue. Enter manually or use the Paste or Select Borehole Pump options.
Motor Size (kW)	Enter manually or use the Paste or Select Borehole Pump options.
Nominal Speed (rpm)	Enter manually or use the Paste or Select Borehole Pump options.
Pump Curve button	Click to open the Pump Curve Editing window where the pump curve for the selected pump displays.
System Curve button	Display the system curve.
Select Pump button	Display the Select Borehole Pump options. It is recommended to run Time Simulation with boreholes modelled as fixed delivery, and with all controls in place.

Controls

Borehole operation can be controlled by pressure, reservoir level, time or delayed start. More than one control criteria can be used simultaneously.

To activate one of the controls, select the appropriate item and fill-in data in the relevant tab.

Controls can be used even when the fixed delivery option is active.

Attachments Page

Files of various types, such as site visit reports, photos showing junction layouts or reinforcement of the reservoir floor, can be attached to Water entities.

Note that only a link to the document is saved in the water file, not the contents of the document.

Option	Description
Attach button	Click to open the standard file dialog and select an attachment.
Replace button	Click to replace the selected attachment with another file.
Detach button	Click to remove the selected attachment from the list.
Open button	Click to open the attached document using the application assigned to that file type.