PERMFILE138823

• Permit No: M2006003
• IBM Index Class Name: Permit File
• Doc Date: 4/28/2006
• Doc Name: Groundwater Reports
• From: Civil Resources
• To: DMG
• Media Type: D
• Archive: No

Table 3
Climate Properties
(values in inches unless otherwise noted)
Average Temperature
(Fahrenheit)
Average Precipitation
Effective Precipitation
Gross Evaporation
Nef Evaporation
Janus 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 usf 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. Average tempemture and predp8ation based on data from the Western Regional Climate Center, (hdp:/Avww.wrcc.dd.edu~ weatherstation at Ft. Lupton &
Bdghton, CC.
2. Average temperature and precpitation pedod of record for the Ft. Lupton Station is 1950-1975 and the pedotl of record forihe Brighton Station 1976 -2000.
3. EHecfive precipitation is the gross precipitation times 70 % to simulate the histodcal precipitation that was consumed by crops and vegetation.
4. Gross evaporation is from the evaporation map of Colorado.
5. Net evaporation is equal to the gross evaporation minus the effective precipitation.
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 Irrigation Recharge
The Site and surrounding areas are composed of agricultural land irrigated during the growing season by ditches and
wells. Irrigation of agricultural land occurs for approximately 6 months, roughly starting in mid-March and ending inmid-
October. The standard practice for the farmers is to apply about three feet of water to the field. Evapotranspiration of
the crops was estimated to consume approximately two feet of water per year as presented in Table 4 resulting in a net
excess of approximately one foot of water.
Table 4
Area Crop Consumptive Use
(values in inches)

Cro
Alfalfa Sweet
Corn
Su arBeets
Potatoes
Avers e
Consum five Use 31.6 22.8 29.3 28.1 27.9
Notes:
Gross consumptive use based on TR-21, Modified Blaney-Griddle Method, Colorado Irrigation Guide Dec.
1988.
Groundwater Model Report -Hall-Irwin Parker-Dersham Site - 4 - April 2006