BOARD01604

• Board Meeting Date: 3/10/1998
• Description: South Platte River Basin Issues - South Platte Water Rights Management System - Status Report
• Board Meetings - Doc Type: Memo

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Agenda Item Zla

Deceaber.l,.l.ll!l6.

G.OGRAPBZCAL ZDORICA'1'%OX sr~ (Grs) t'YWlntOlfD'rS
POR 'rIIB SOtI'1'Il PLA'1"8 WA'l'D. RIGII'1'S JQJU.GDDl'l' SYSTIDI (SPWIlXSI

A priority need of water managers in the South Pla.tte Basin in Colorado is
an easy and efficient process for accura.tely computing augmentation requirements
for existing wells. Providing data on groundwater characteristics and usage
through user-friendly computer softwear tools will also assist._ter managers in
developing future conjunctive use oppo~unities.

The tools should be modul.. of th. SBO' s SPWRMS so it can utilise that
system's databases on surface diversiOtls and water rights. Thes.e new tools or
modules should be PC-based with reasonably priced softwear 80 its accessible to
all water users. Input and output should be .both taJ)ular and graphical and
utilize the map viewing capabilities of GIS.

The following tasks or objectives would be coordinated and managed by the
South Platte Advisory Committee with. the lead investigator being Luis Garcia of
the Integrated Decision Support Group (IDS) of CStl".

The databases to be developed as I!l&P layers in a GIS 8y1Jtem for the South
Platte would consist of:

.--Prom ASCS aerial photos and satellite imagery;
(1). Layout of fields
(2) Irrigated acreage
(3) Crop type
(4) Canal system layout (ie, ditch laterals, tailwater ponds, recharge sites,
. etc)

--Prom SEO and augmentation plans (GASP, CCWCD, LSPWCD, and individual plans).;
(5) Well locations
These agencies databases would also provide information on irrigated acreage,
crop type, type of irrigation, and estimates of historical gross well pumpage.

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--Prom county land ownership maps;
(6) Landowner property boundaries
A relational database of landowner information would link to the well
. information database and contain other information such as ditch shares.

- - From USGS, Hurr maps and quad sheets;
(7) Bedrock elevations
(8) Water table elevations
(9) Ground surface elevations
(10) Permeability or transmissivity
(11) SDF values

Combining these databases with historical diversion data contained in the
point flow module of the SPWRMS, a water balance computation within GIS of the
consumptive use ~(CO) of groundwater by wells could be accCllllplished. Data from
weather stations combined with irrigated acreage and crop type would provide a
cCllllputation of total crop consumpti va use through a CO module. The ditch shares
of a landowner combined with historical diversion data and assumptions on