RGDSS_Historic_CUreport_20040601

• Title: RGDSS - Rio Grande Historic Crop Consumptive Use Analysis
• Description: The documentation is for the Rio Grande Basin Historic Crop Consumptive Use Analysis, developed during the RGDSS implementation for the period 1950 through 2002. It includes 100 percent of the crop consumptive use in the basin for the period. Documentation consists of the final Historic Crop Consumptive Use Analysis Report and supporting appendices.
• Decision Support - Doc Type: Modeling Dataset Documentation
• Date: 6/1/2004
• DSS Category: Consumptive Use
• DSS: Rio Grande
• Basin: Rio Grande
• Contract/PO #: C153863
• Grant Type: Non-Reimbursable
• Bill Number: HB98-1189, SB99-173
• Prepared By: Leonard Rice Engineering

Figure 12 presents basin crop consumptive use results by year. As shown, the percent of
irrigation water requirement not satisfied has decreased slightly over time, averaging 32
percent. Greater shortages from 1950 through 1956, averaging 43 percent, represent
limited water supply due to well development levels and below average stream flows.
Shortages averaging 27 percent from 1990 through 1999 are consistent with well
development and normal to above average stream flows.
Figure 12
Irrigation Water Requirements and Water Supply-Limited CU
1800000
1600000
1400000
1200000
r
'~ 1000000
L
V
:~ 800000
U
600000
400000
200000
0
®WaterSupply-Limited CU OShortage -Irrigation Water Requirement
Average monthly shortages for the study period vary from a low of 14 percent in May to
a high of 50 percent in September and October, as shown in Table 17.
Table 17
Average Monthly Shortage - 1950 through 2002
Month Apr May Jun Jul Aug Sep Oct
Average Shortage 26% 14% 24% 34% 40% 50% 50%
cureport_6-2004.doc 37 of 48 June, 2004
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000