2014-08-12_HYDROLOGY - M1978056

• Permit No: M1978056
• IBM Index Class Name: Hydrology
• Doc Date: 8/12/2014
• Doc Name: SWSP Amendment
• From: DWR
• To: Cheryl Signs Engineering
• Permit Index Doc Type: Hydrology Report
• Email Name: PSH
• Media Type: D
• Archive: No

Cheryl Signs, P.E. Page 7
Durham Combined SWSP
August 12, 2014
• Water in excess of the irrigation requirement was added to the soil moisture bank, which was
assumed to be three feet deep with an available water holding capacity of 0.2 inches of water
per inch of soil.
• Cropping information was obtained from the USDA Farm Service Agency on Kurtz Ranch and
aerial photos for the Von Ohlen Farm and the Heizelman Farm
• Return flows analyzed using AWAS software and the Glover methodology according to the
parameters summarized in table below:
Summaryof Glover Parameters
Farm Distance from Farm Distance from boundary Transmissivity Specific Yield
to River(ft) to River(ft) (gpd/ft)
Kurtz 520 3,950 100,000 0.28
Vaon Ohlen 716 4,000 100,000 0.28
Heintzelman 450 1,100 1 100,000 0.28
The analysis for each farm is further described below.
Kurtz Farm
The 3 shares on the Kurtz Farm were used to irrigate approximately 264.7 acres located in the
located in Sections 28 and 29, Township 3 North, Range 67 West of the 6th P.M. The Applicant's HCU
was based on a crop mix of corn, beets, alfalfa, grain, beans and pasture grass. The HCU results are
summarized in table below.
Kurtz Farm HCU Results
Month Jan Feb I Mar Apr May Jun Jul AugSep Oct Nov Dec Total
Farm
Headgate
Delivery0.0 0.0 0.0 12.9 92.6 165.5 229.8 210.7 145.1 18.3 0.0 0.0 874.8
On Farm
Depletion of
Surface
Water 0.0 0.0 0.0 10.9 30.0 74.8 127.6 105.3 52.3 14.7 0.0 0.0 415.6
Surface
Return Flows 0.0 0.0 1 0.0 1.3 9.3 16.5 23.0 21.1 14.5 1.8 0.0 0.0 87.5
Ground Water
Return flows 0.0 0.0 0.0 4.8 48A 68.6 85.5 85.0 75.1 6.8 0.0 0.0 374.2
Lagged
Ground Water
Return Flows 6.7 5.3 4.2 6.2 32.6 53.2 69.3 74.6 70.9 29.7 12.7 8.6 374.2
Average Net
Depletion -6.7 -5.3 -4.2 5.4 50.7 95.8 137.5 115.0 59.7 -11.4 -12.7 -8.6 415.2
Return Flow
Factor 0.8% 0.6% 0.5% 48% 35% 32% 30% 35% 49% 3.4% 1.5% 1.0% NA
Von Ohlen Farm
The one share on the Von Ohlen Farm was used to irrigate approximately 90 acres located in
Section 31, Township 3 North, Range 67 West of the 6th P.M. The Applicant's HCU was based on 90
acres of crop mix of corn, beets, alfalfa, grain, beans and pasture grass.
The HCU results are summarized in the table below.