Dimensional Format
Line-by-line instructions for creating a data-input file for the dimensional format follow. Variable names that
are used in the input file and computer program are shown in upper-case text.
Part I: Aquifer Characteristics and General Information

Line 1:
TITLE--Title of simulation, which can be up to 70 characters in length. Leave this line blank if no title is specified.

Line 2:
FORMAT--Analysis format. Enter DIMENSIONAL.

Line 3:
AQTYPE--Type of aquifer being simulated. Two options are provided:
AQTYPE = CONFINED or
AQTYPE = WATER TABLE.

Line 4:
BB--Thickness or saturated thickness of aquifer at beginning of simulation, in units of length.
HKR--Horizontal hydraulic conductivity of aquifer, in units of length per time.
HKZ--Vertical hydraulic conductivity of aquifer, in units of length per time.
SS--Specific storage of aquifer, in units of inverse length.
SY--Specific yield of aquifer, dimensionless. Enter 0.0D0 if AQTYPE = CONFINED.

Line 5:
IDRA--Type of drainage at water table. Enter 0 if AQTYPE = CONFINED. Two options are provided:
IDRA = 0: Instantaneous drainage.
IDRA = 1: Delayed drainage.
NALPHA--Number of drainage constants. Enter 0 if IDRA = 0. NALPHA must be less than or equal to 5.

Line 6:
ALPHA(I)--A single row of NALPHA drainage constants, in units of inverse time. Successive values must be
separated by at least 1 space. Maximum of 5 values is allowed. Enter 1.0D09 if IDRA = 0.

Line 7:
ITS--Time specification:
ITS = 0: Log-cycle time steps (use when dimensional theoretical curves are desired).
ITS = 1: User-specified times.
IMEAS--Specification of measured drawdown data. Enter 0 if ITS = 0. Options for ITS = 1:
IMEAS = 0: Measured drawdown data not specified for each time.
IMEAS = 1: Measured drawdown data specified for each time.

Line 8:
TLAST--Largest value of time. Enter 0.0D0 if ITS = 1.
NLC--Number of logarithmic cycles on the time scale for which drawdown will be calculated. Enter 0 if ITS = 1.
NOX--Number of equally spaced times per logarithmic cycle for which drawdown will be calculated. Enter 0 if
ITS = 1.

Line 9: Program-solution variables. See “Description of Selected Program Options and Variables” for information
on these variables.
RERRNR--Relative error for Newton-Raphson iteration and finite summations of drawdown for water-table
aquifers. A value of 1.0D-10 is suggested. Enter 0.0D0 for AQTYPE = CONFINED.
RERRSUM--Relative error for finite summations of drawdown for confined aquifers. Suggested value is 1.0D-07
to 1.0D-08. Enter 0.0D0 if AQTYPE = WATER TABLE.
NMAX--Maximum number of terms permitted in the finite summations of drawdown for confined aquifers.
Suggested value is 200. Enter 0 if AQTYPE = WATER TABLE.
NTMS--Factor used to determine number of terms in the finite summations for drawdown for water-table aquifers.
Suggested values are 20 or 30. Enter 0 if AQTYPE = CONFINED.
NS--Number of terms used in the Stehfest algorithm. This must be an even integer, the value of which depends
upon computer precision. If the computer holds 16 significant figures in double precision, let NS = 8 to 12. A
value of 8 is often sufficient.


Part II: Pumped-Well Information

Line 10:
IPWS--Type of pumped well:
IPWS = 0: Partially penetrating pumped well.
IPWS = 1: Fully penetrating pumped well.
IPWD--Type of diameter of pumped well:
IPWD = 0: Infinitesimal diameter (line-source theory).
IPWD = 1: Finite diameter.

Line 11:
QQ--Pumping rate of well, in units of cubic length per time.
RW--Radius of pumped well screen, in units of length.
RC--Inside radius of pumped well in the interval where water levels are changing during pumping, in units of
length. Enter 0.0D0 if IPWD = 0.
ZPD--Depth below top of aquifer or initial water table to the top of the screened interval of the pumped well, in
units of length.
ZPL--Depth below top of aquifer or initial water table to the bottom of the screened interval of the pumped well, in
units of length.
SW--Well-bore skin parameter, dimensionless.
Lines 12 and 13: Information on user-specified times for which drawdowns will be calculated for the pumped
well. Skip to line 14 if ITS = 0.

Line 12:
NTSPW--Number of user-specified times for which drawdown at the pumped well will be calculated. If NTSPW =
0, no drawdowns are calculated for the pumped well.
IRUN--Option to suppress drawdown calculations for the pumped well. Allows user to specify time-drawdown data
(Line 13), but those data are ignored during the simulation. Options are:
IRUN = 0: Drawdowns not calculated.
IRUN = 1: Drawdowns calculated.

Line 13: Time and measured drawdown data for pumped well. Repeat this line of input data NTSPW times (if
NTSPW = 0, skip to line 14):
TIMEPW(I)--Time I.
XMEASPW(I)--Measured drawdown at pumped well for time I, in units of length. Leave blank if IMEAS = 0.


Part III: Observation-Well Information

Line 14:
NOBWC--Number of observation wells or piezometers for which drawdown curves will be calculated. Must be
less than or equal to 25.
Lines 15 through 18: Repeat lines 15 through 18 for each of the NOBWC observation wells or piezometers.

Line 15:
IOWS--Type of observation well or piezometer:
IOWS = 0: Partially penetrating observation well.
IOWS = 1: Fully penetrating observation well.
IOWS = 2: Observation piezometer.
IDPR--Option for delayed response of observation well. Valid only for IOWS = 0 or 1:
IDPR = 0: No delayed response.
IDPR = 1: Delayed response.

Line 16:
R--Radial distance from axis of pumped well to observation well or piezometer, in units of length.
Z1--Depth below top of aquifer or initial water table to the top of screened interval of observation well, in units of
length. Use for IOWS = 0 or 1. Enter 0.0D0 if IOWS = 2.
Z2--Depth below top of aquifer or initial water table to the bottom of screened interval of observation well, in units
of length. Use for IOWS = 0 or 1. Enter 0.0D0 if IOWS = 2.
ZP--Depth below top of aquifer or initial water table to center of piezometer, in units of length. Use for IOWS = 2.
Enter 0.0D0 if IOWS = 0 or 1.
RP--Inside radius of the observation well standpipe in the interval over which water levels are changing during
pumping, in units of length. Enter 0.0D0 if IDPR = 0.
XLL--Length of screened interval of observation well, in units of length. Enter 0.0D0 if IDPR = 0.
Lines 17 and 18: Information on user-specified times for which drawdowns will be calculated for the observation
well or piezometer. Skip these lines if ITS = 0.

Line 17:
NTSOB--Number of user-specified times for which drawdown at the observation well or piezometer will be
calculated. If NTSOB = 0, no drawdowns are calculated for the observation well or piezometer.
IRUN--Option to suppress drawdown calculations for the observation well or piezometer. Allows user to specify
time-drawdown data (Line 18), but those data are ignored during the simulation. Options are:
IRUN = 0: Drawdowns not calculated.
IRUN = 1: Drawdowns calculated.

Line 18: Time and measured drawdown data for observation well or piezometer. Repeat this line of input data
NTSOB times (if NTSOB = 0, skip to next observation point):
TIMEOB(I)--Time I.
XMEASOB(I)--Measured drawdown at observation well or piezometer for time I, in units of length. Leave blank if
IMEAS = 0.
