2014-06-17_HYDROLOGY - M1977572

• Permit No: M1977572
• IBM Index Class Name: Hydrology
• Doc Date: 6/17/2014
• Doc Name: SWSP
• From: DWR
• To: Helton & Williamsen
• Permit Index Doc Type: Hydrology Report
• Email Name: AME
• Media Type: D
• Archive: No

Table 1
City of Lamar
Lamar North Gateway Park Pond Nos. 1,2 and 3
Derivation of Monthly Evaporation Rates
Monthly Gross Average Effective Net Pond
Month Distribution Evaporation Rate Precipitation Precipitation Evaporation Rate Evaporation
M (in) (in) (in) (ft) (af)
(1) (2) (3) (4) (5) (6) (7)
January 3.0 1.80 0.38 0.27 0.13 3.02
February 3.5 2.10 0.47 0.33 0.15 3.48
March 5.5 3.30 0.86 0.60 0.22 5.10
April 9.0 5.40 1.45 1.01 0.37 8.58
May 12.0 7.20 2.42 1.69 0.46 10.67
June 14.5 8.70 2.24 1.56 0.59 13.69
July 15.0 9.00 2.30 1.61 0.62 14.38
August 13.5 8.10 2.17 1.52 0.55 12.76
September 10.0 6.00 1.19 0.84 0.43 9.98
October 7.0 4.20 0.88 0.62 0.30 6.96
November 4.0 2.40 0.57 0.40 0.17 3.94
December 3.0 1.80 0.44 0.31 0.12 2.78
Total 100.0 60.00 15.37 10.76 4.11 95.36
Explanation of Columns:
2) Monthly Distribution from"General Guidelines for Substitute Water Supply for Sand and Gravel Pits"(Updated April 1, 2011)
3) Interpolated from"Evaporation Atlas for the Contiguous 48 United States", NOAA Technical Report NWS 33 Map 3,
U.S. Department of Commerce, June 1982.
4) Average Precipitation from Colorado Climate Center for Lamar Climate Station No. 54770 for 1900-1999.
5) Column 4 X 70 percent.
6) Column 3-Column 5/12.
7) Column 6 X 23.2 acres.
1-1001\Table 1
Helton&Williamsen,P.C.