PERMFILE66907

• Permit No: M2004078
• IBM Index Class Name: Permit File
• Doc Date: 2/28/2005
• Doc Name: Groundwater Model
• From: Civil Resources
• To: DMG
• Media Type: D
• Archive: No

Table 2
Regional Hydraulic Conductivity

Geological Unit
Hydraulic Conductivity (today) Average Geological Unit
Thickness ft
Range of Values 20 - 750 NA
Eolian 50 7
Broadway 165 40
Pine Creek 250 10
3.7 Recharge Due to Precipitation
The climate in the Ft. Lupton area is generally and (evaporation rates are approximately three feet per year) with
temperatures and precipitation as shown below.
Table 3
Climate Properties
(values in inches unless othenxise noted)
Average temperature (Fahrenheit) Average Precipitation Effective Precipitation Gross Evaporation Net Evaporation
Janua 28.0 0.4 0.3 1.3 1.0
Februa 32.9 0.4 0.3 1.5 1.3
March 39.1 1.0 0.7 2.4 1.7
A ril 48.1 1.4 1.0 4.0 3.0
Ma 57.7 2.1 1.5 5.3 3.8
June 67.3 1.6 1.1 6.4 5.2
Jul 72.8 1.4 1.0 6.6 5.6
Au ust 70.7 1.4 1.0 5.9 5.0
Se tembe 61.9 1.2 0.8 4.4 3.6
October 50.8 0.8 0.6 3.1 2.5
November 37.1 0.7 0.5 1.8 1.3
December 29.5 0.4 0.3 1.3 1.0
Total 13.0 9.1 44.0 34.9
Notes:
1. Ave2ge temperature and precipitation based on data from the Western Regional Climate Center, (httplMnvw.wrcc.dri.edu~ weatherstation at Ft. Lupton 8 Brghton, CO.
2. Average temperature and precipitation period of record for the FL Lupton Station is 1950 -1975 and the period of record for Ne Brighton Staticn 1976 - 2000.
3. Effective predpitation is the gnoss predpitation times 70%to simulate the histodcal predpitation lhatwas co~umed by ao{~ and vegetation.
4. Gross evaporation Ls from the evaporation map of Colorado.
5. Net evaporation ¢ equal to the gross evaporation minus the effective precipitatlon.
Approximately 13 inches of precipitation is anticipated at the Site on an annual basis. Recharge due to precipitation has
been estimated at 5°!°-20% (Brendle, 2002). This equates to a range of 0.65 inches per year to 2.6 inches per year.
3.8 Inigation Recharge
The Site and surrounding areas are composed of agricultural land imgated during the growing season by ditches and
wells. Irrigation of agricultural land occurs for approximately 6 months, roughly starting in mid-March and ending in mid-
October. The standard practice for the farmers is to apply about three feet of water to the field. Evapotranspiration of
Groundwater Model Report - SW TKO Water Storage Project - 4 - February 2005