WSP03204

• File Number: 8460.500
• Description: Platte River Recovery Plan - SPDSS Studies ‎(see also 8483)‎
• Basin: South Platte
• Date: 1/1/1998
• Author: Colorado State Univ.
• Title: South Platte Mapping and Analysis Program ‎(SPMAP)‎ First Edition User Manual - Version 1.4
• Water Supply Pro - Doc Type: Publication

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Map Themes Pull-Down Menu

. Based on the USGS publication (USGS, 1983) definitions of the major and minor attributes the
area, perimeter, plss#, plss-id, pls#, pls-id, section, section_mod, township, base_side, range
meridian_side, and meridian were assigned to the coverage,

. Resolved joining errors by linking vectors from the boundaries of individual tiles,

. Corrected all the zero category data areas to reflect the correct codes,

4. Coverage was clipped for Water Division I.

Three coverages were created for the South Platte Extension, the first describes the township, baseline,
range, and section values for each polygon and the second has the section lines removed. The township,
baseline, range, and section information is used to query for locations for wells and to locate areas for
display.

3.2.8 Stream DeDletion Factors (SDFs) Theme

Digitized from (Hurr and Schneider, 1972) for each reach in the South Platte River Basin by Mario
Mejia-Navaro with the IDS Group at CSU. Stream depletion factors are an estimate of how long water
withdrawn from a well will take to deplete the river. These values are routinely used to determine when the
effect of a well will be experienced in the South Platte River.

Once this coverage was digitized and edited for errors, the South Platte River was added with a SDF
value ofO. ARC/INFO was used to generate a Triangular Irregular Network (TIN) line coverage using ARC/
TIN, The TIN coverage was used to generate SDF isolines for every ten days, The resulting coverage was
then split into small segments and converted to the GIS GRASS (Geographical Resources Analysis Support
System) to generate 40 meter (0.59 acres) grid resolution raster maps, These raster maps were then joined
for each Water District and exported back to ARC/INFO for display, The resulting coverages for each Water
District in Water Division I show an SDF value for each acre in the South Platte River Basin, These values
will be used to assign SDF values for each well in the basin. As the location of the wells improves the
accuracy of the SDF values assigned to them will also be improved. Technical questions and comments can
be addressed to the IDS Group at Csu.

Jk2 Water District Boundaries Theme

The South Platte area is the same as the Water Division I area, therefore only the Water District
boundaries within Division I are populated. United States Department of the Interior Geological Survey
(USGS) digital line graphs (DLGs) data were used to populate this theme by the IDS Group at Colorado
State University.

3.3 Adding a Map Theme to a View

I. Select maps from the Map Themes pull-down menu. As maps are selected they will be displayed
and saved as part of the active View window.

2. As you select map themes, the image will be displayed in the View window and the names of the
themes that you selected will be displayed in a vertical legend along the left side of the View
window. Themes that are turned on are designated by a check mark and are visible in the View
window. Themes that are turned off appear in the legend, but are not designated by a check mark
and do not appear in the View window.

Version 1.4

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Adding a Map Theme to a View