WSP12894

• File Number: 8483
• Description: SPDSS
• State: CO
• Basin: South Platte
• Date: 1/1/2001
• Author: CWRRI
• Title: South Platte Mapping and Analysis Program ‎(SPMAP)‎ Decision Support Tools for the Lower South Platte
• Water Supply Pro - Doc Type: Publication

V. Description of Data and Software: Combined Use of Software

3.2 Development of SDF View Interface for
Windows 95/98/NT/2000

The base FORTRAN model for SDP View is
the USGS's SDF Model. After input file filters
were built and tested for the USGS Model, a
GUI was constructed using Visual c++ and
tested by the advisory committee. A number of
additional functions were identified to be
implemented with SDP View, primarily tools to
build the input files and view output.

J.J. Functionality Developed for Needs in the
South Platte

As with the other tools developed as part of
SPMAP, the functionality ofSDP View was
developed in close coordination with the South
Platte Advisory Committee.

D.J. Building SDF Input Files

Data can be entered in irrigation, calendar, or
USGS year types with monthly totals or average
daily values. Most of the time data are available
in monthly totals, therefore the conversion used
to run the model in average daily values has two
options. The default option is to use actual
numbers of days in the month and taking into
account leap years. You can also use a
conversion rate that is the same for all months
and years (30.417 days per month).

You can enter recharge or consumptive use
amounts directly or you can use pumping
records that will compute consumptive use

4.0 Combined Use of Software

amounts based on gross pumping and an
application efficiency to obtain consumptive use
of groundwater. Data for SDP View can be
entered into a spreadsheet and then imported.

3.3.2 Proiectin~ Data to Build an Input File

SDP View can be used to project future
depletions or accretions to a river. This is done
first by entering known historical data for
recharge and consumptive use and then
projecting into the future by repeating the record
and/or averages over a selected range of
historical years or a single year.

3.3.3 Running: the SDF View Model

The USGS computational component is
designed to run based on USGS water years
(start in October and ends in September.
Therefore functionality was built into the system
for users to convert data sets from calendar or
irrigation water years. The basic difference is the
beginning and ending of month of the year
system, for example the calendar year starts in
January and ends in December, an irrigation
water year starts in November and ends in
October.

3.3.4 Outout Disolay

Output from SDP View can be printed,
exported to spreadsheets, or plotted with the
interface. The type of water year can be selected
for the output display of the depletion/accretion
impacts at the river computed by SDP View.

The combination of the three tools developed
for SPMAP provide a comprehensive and
flexible approach to meeting the modeling needs
of water managers on the South Platte River.
The GIS tools can be used to determine the
location and size of irrigated lands, groundwater
wells, weather stations and other data important
for determining consumptive use for an area.
This data can then be used to run the SPCU

Model to estimate CU as well as groundwater
withdrawals to meet crop water needs. The CU
withdrawals by pumping can then be exported to
SDP View which can estimate the impact
groundwater pumping will have on the South
Platte river. SDP View can also be used to
determine the effects of groundwater recharge
on the South Platte river.

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Completion Report: South Platte Mapping and Analysis Program