2012-07-25_HYDROLOGY - M1986123

• Permit No: M1986123
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/25/2012
• Doc Name: SUBSTITUTE WATER SUPPLY PLAN
• From: DWR
• To: DRMS
• Email Name: MAC
• Media Type: D
• Archive: No

A1.1. Evaporative Loss Calculation Worksheet - Existing Ponds
Area of Exposed Groundwater.' 21.49 acres
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Free Free Water Total Net
Monthly Surface Monthly Surface Gross Effective Effective Total Net Lagged
Fraction of Evaporation Evaporation Area Evaporation Mean Rainfall Precipitation Precipitation Evaporation Evaporation
Month Evaporation [ft] [ft] [acre] [acre -ft] [in] [in] [acre -ft] [acre -ft] [acre -ft]
Jan 0.03 3.25 0.10 21.49 0.00 0.36 0.25 0.45 0.00 1.70
Feb 0.04 3.25 0.11 21.49 0.00 0.48 0.34 0.60 0.00 1.36
Mar 0.06 3.25 0.18 21.49 3.84 1.20 0.84 1.50 2.34 1.87
Apr 0.09 3.25 0.29 21.49 6.29 1.98 1.39 2.48 3.80 2.80
May 0.12 3.25 0.39 21.49 8.38 2.72 1.90 3.41 4.97 3.64
June 0.15 3.25 0.47 21.49 10.13 1.83 1.28 2.29 7.83 5.02
Jul 0.15 3.25 0.49 21.49 10.48 1.60 1.12 2.01 8.47 6.20
Aug 0.14 3.25 0.44 21.49 9.43 1.44 1.01 1.81 7.62 6.49
Sep 0.10 3.25 0.33 21.49 6.98 1.30 0.91 1.63 5.35 5.84
Oct 0.07 3.25 0.23 21.49 4.89 1.13 0.79 1.42 3.47 4.77
Nov 0.04 3.25 0.13 21.49 2.79 0.59 0.41 0.74 2.05 3.73
Dec 0.03 3.25 0.10 21.49 0.00 0.49 0.34 0.61 0.00 2.50
totals 3.25 63.21 15.12 10.58 45.92 45.92
Notes:
(1) = Monthly fraction of evaporation for elevations below 6500 ft from Guidelines
for Substitute Water Supply Plans.
(2) = Gross free water surface evaporation from NOAA Technical Report NWS 33
(3) = Columns (1) x (2)
(4) = Total free water surface area - 18.1ac pond
(5) = Columns (3) x (4) Values Set to Zero For Ice Cover Months (Dec -Feb)
(6) = Mean Rainfall (1 C / 893 - 2a /o) c Th r f it 'i�lr_S
(7) = Effective Rainfall = Column (6)* 0.7
(8) = Column (7) * (1112)* Column (4)
(9) = Column (5) - Coulmn (8)
(10) = Lagged Evaporative Loss (see AI.5)