 |
I don't know the thickness of my aquifer from well logs. What should I
enter for aquifer thickness? |
| |
You'll have to estimate the thickness from other sources (published reports,
geologic maps, geophysics, etc.). Another strategy is to perform a sensitivity analysis
for a range of aquifer thickness values and see how changing the aquifer
thickness affects your results. |
|
|
What do I enter for the vertical-to-horizontal hydraulic conductivity
ratio? |
| |
The default value is 1 (isotropic). For some aquifers (e.g., stratified
aquifers), the value may be less than 1. If you have an independent
estimate, you may enter it. |
|
|
How do I enter well screen depths? |
| |
Enter depths measured from the top of the aquifer not from
land surface. In a confined aquifer, measure depths from the upper confining
unit. In an unconfined aquifer, measure depths from the static water table.
For a well screened across the water table, click
here. |
|
|
My well is screened across the water table. What do I enter for d
(depth to top of screen) and L (screen length)? |
| |
For a well screened across the water table, enter d=0. Enter the
submerged length of screen for L. |
|
|
What is the casing radius? |
| |
The casing radius refers to the radius of the unperforated portion of
the well pipe above the open interval (screen). The casing radius may be
less than, equal to or equal to the well radius
depending on the construction of your well. |
|
|
What do I enter for the equipment radius? |
| |
Enter the effective radius of downhole equipment (e.g., pumping
discharge line, transducer cable, etc.). When you enter the equipment radius
greater than zero, AQTESOLV corrects the casing
radius to account for the reduced area inside the casing. The equipment
radius should be less than the casing radius. Enter zero for no correction. |
|
|
What do I enter for the packer radius? |
| |
The packer radius only applies to certain solutions such as the
McElwee-Zenner slug test model. Enter zero otherwise. |
|
|
What do I enter for the well radius? |
| |
For a well without a filter pack, enter the screen radius or the
wellbore radius for an open hole. For a well with a filter pack, enter the
wellbore radius if the filter pack material is much more permeable than the
formation; otherwise enter the screen radius. The well radius may be smaller
than, equal to or larger than the casing radius
depending on the construction of your well. |
|
|
What do I enter for the skin radius? |
| |
Enter the skin radius greater than or equal to the
well radius. Note that the skin radius only
applies to certain solutions such as the KGS Model for slug tests. |
|
|
When should I correct for filter pack porosity? |
| |
The optional correction for gravel pack porosity recommended by Bouwer
and Rice (1976) is only required for slug tests when the well is screened
across the water table. Do not apply the filter pack correction when the
screen is fully submerged or when the aquifer is confined. |
|
|
How do I enter the pumping rate for a constant-rate pumping test? |
| |
When you enter rates into AQTESOLV, enter the time for each measured
rate as the elapsed time since the start of the test when the rate becomes
active. Thus, for a constant-rate test, enter 0.0 for time and the constant
rate into AQTESOLV. You only need to enter one pumping rate for a
constant-rate test. |
|
|
How do I enter pumping rates for a test with recovery? |
| |
When you enter rates into AQTESOLV for a recovery test, first enter
all of the rates measured prior to recovery. Then enter the time when
recovery begins (enter this time as elapsed time since pumping began) and a
rate of 0.0. |
|
|
How do I configure Win-Situ 5 to
work with AQTESOLV? |
| |
To work with any version of AQTESOLV, configure Win-Situ
5 to export time with a 24-hour clock format.
- Download and install the latest
Win-Situ software for the Level TROLL from the In-Situ web site.
- Start the Win-Situ application.
- Choose General Settings from the Preferences menu.
- In
the Time Format group of settings, select the
Custom option and enter H:mm:ss in the Time input box (note the
capital "H"
in the format string configures a 24-hour clock for the time stamp).
- Click OK to save the new settings.
|
|
|
How do I place the origin in the upper left corner of my plots? |
| |
Choose Format from the View
menu and click the Graph tab to
change the origin of the plot to the upper-left corner. |
|
|
Why don't I see any data when I try to view an Agarwal plot? |
| |
To use an
Agarwal plot to analyze data from a recovery test, make sure that your
observation well data include a drawdown value measured at time tp
when the pump was shut off. Let us suppose that you pump a well for 1440
minutes and monitor recovery after turning off the pump. Your observation
data must include a drawdown measurement at 1440 minutes (tp)
if you intend to use the Agarwal method. |
|
|
How do I fit the legend of my plot on a single page? |
| |
To fit more legend information on one page when printing a plot, change
formatting options (View>Format>Legend tab) such as the font size or the
number of items displayed. |
|
|
What should I do when I see "Check Errors" at the bottom of the
AQTESOLV window? |
| |
When you see Check Errors on the
status bar, choose
Error Log from the View menu to identify and correct errors that AQTESOLV has detected in
the data set. |
|
|
How do I correct errors listed in the Error Log? |
| |
Choose options from the Edit menu to modify the data set. |
|
|
Why does the Error Log tell me there are no observations in my data
set when I'm performing a forward solution? |
| |
This error only applies to curve matching analyses. You may ignore the
message and proceed with a forward solution analysis. |
|
|
Why does the Error Log tell me that the depth to the
bottom of a well screen exceeds the aquifer thickness? |
| |
You are required to enter d (the depth to the top of
the well screen) and L (screen length) for partially penetrating
wells. The sum of d+L should not exceed the thickness of the aquifer.
For more information on entering well depths, click
here. |
