2014-10-01_HYDROLOGY - M2009024

• Permit No: M2009024
• IBM Index Class Name: Hydrology
• Doc Date: 10/1/2014
• Doc Name: SWSP
• From: DWR
• To: Wright Water Engineers, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: KAP
• Media Type: D
• Archive: No

Appendix A
Evaporation Calculation for Site near Simmons Pit, Mancos, CO
Four Corners Materials
Surface Area of HCU Ponds 0.49 acres
Gross Evaporation 45.57 inchesa
Precipitation Station Mancos
(1) (2) (3) (4) (5) (6) (7)
Monthly Net Unit Net Unit Total Net
Evaporation Gross Average Year Effective Evaporation
Evaporation Precipitation Precipitation Evaporation Evaporation HCU Storage
Distribution Rate Rate Ponds
Month a Inc es Inc es (inches) (inches) (feet)
January 1.0 0.46 1.44 1.01 0.00 0.00 0.00
February 3.0 1.37 1.29 0.90 0.46 0.04 0.02
March 6.0 2.73 1.61 1.13 1.61 0.13 0.07
April 9.0 4.10 1.36 0.95 3.15 0.26 0.13
May 12.5 5.70 1.13 0.79 4.91 0.41 0.20
June 15.5 7.06 0.64 0.45 6.62 0.55 0.27
July 1 16.0 7.29 1.76 1.23 6.06 0.50 0.25
August 13.0 5.92 1.96 1.37 4.55 0.38 0.19
September 11.0 5.01 1.53 1.07 3.94 0.33 0.16
October 7.5 3.42 1.61 1.13 2.29 0.19 0.09
November 4.0 1.82 1.20 0.84 0.98 0.08 0.04
December 1.5 0.68 1.34 0.94 0.00 0.00 0.00
Annual 1 1001 45.571 16.871 11.811 34.571 2.881 1.41
Column Notes:(1) From SEC's Guidelines(2/28/95)for sites With elevation above 6,500 ft
(2) Annual value from NOAA Technical Report NWS 33.
(3) Average annual precipitation data from NOAA recording station at Mancos
(4) Equals Column(3)x 0.70
(5) Column(2)-Column(4)
(6) Column(5)/12
(7) Column(6)x surface area of HCU ponds in acres. HCU ponds are on-channel
(8)Column(2)/12 x surface area of wash pit in acres. Wash pits are not on-channel
Footnote: (a)Interpolations from CDSS evaporation contour of 45 in.and 50 in.
P:\031-007\120-Simmons\SWSP Renewal 2014\
Simmons SWSP Tables 2014 Wright Water Engineers,Inc. des:RKH
Al-Evaporative Depletions June 2014 ckd:PRF