2021-10-27_HYDROLOGY - M2002120

• Permit No: M2002120
• IBM Index Class Name: Hydrology
• Doc Date: 10/27/2021
• Doc Name: Substitute Water Supply Plan
• From: Water Resources
• To: DRMS
• Email Name: PSH
• Email Name: JLE
• Media Type: D
• Archive: No

Table 1
Bernhardt Pit
Evaporative and Operational Losses
Percent of Gross Average Effective Net Net Water Surface
Month Annual Evaporation Precipitation Precipitation Evaporation Evaporation for
Evaporation 4.3
(inches) (inches) (inches) (inches) (acre-feet)
I1] [2] [3] [4] 151 [6]
January 3.0% 1.32 0.40 0.28 1.03 0.37
February 3.5% 1.53 0.39 0.28 1.26 0.45
March 5.5% 2.41 1.10 0.77 1.65 0.59
April 9.0% 3.95 1.60 1.12 2.82 1.01
May 12.0% 5.26 2.51 1.76 3.50 1.26
June 14.5% 6.36 1.68 1.18 5.18 1.86
July 15.0% 6.58 1.11 0.77 5.80 2.08
August 13.5% 5.92 1.24 0.87 5.05 1.81
September 10.0% 4.39 1.24 0.87 3.51 1.26
October 7.0% 3.07 0.85 0.59 2.48 0.89
November 4.0% 1.75 0.68 0.47 1.28 0.46
December 3.0% 1.32 0.47 0.33 0.99 0.35
Total 1 100.0% 43.86 13.27 9.29 34.57 12.39
Percent of Amount of Water Lost Percent of Amount of Water Used Water Used Total
Month Annual Aggregate With Mined Annual Concrete in Concrete for Dust Evaporative
Aggregate Production Aggregate &Concrete Production Batching Control &Operational
Production Production Losses
(tons) (acre-feet) (cubic yards) (acre-feet) (acre-feet) (acre-feet)
[7] [8] 191 [10] [11] [12] [13] [14]
January 6.3% 25,267 0.00 0.0% 0 0.00 0.18 0.55
February 5.3% 21,204 0.00 0.0% 0 0.00 0.18 0.63
March 9.0% 36,102 0.00 0.0% 0 0.00 0.18 0.77
April 8.7% 34,742 0.00 0.0% 0 0.00 0.18 1.19
May 7.2% 28,696 0.00 0.0% 0 0.00 0.18 1.44
June 11.7% 46,854 0.00 0.0% 0 0.00 0.18 2.04
July 10.2% 40,684 0.00 0.0% 0 0.00 0.18 2.26
August 10.0% 39,821 0.00 0.0% 0 0.00 0.18 1.99
September 9.8% 39,025 0.00 0.0% 0 0.00 0.18 1.44
October 9.0% 35,839 0.00 0.0% 0 0.00 0.18 1.07
November 7.0% 27,875 0.00 0.0% 0 0.00 0.18 0.64
December 6.0% 24,000 0.00 0.0% 0 0.00 0.18 0.53
Total 1 100.0% 400,000 0.00 0.0% 0 0.00 2.16 14.55
Notes:
[1]From SB 120,the evaporation percentages are for gravel pits with elevations below 6,500 feet.
[2]Equals Percent of Annual Evaporation times 43.86 inches.
[3]From Colorado State Universitys Colorado Climate Center web page,hftpJ/ccc.atmos.colostate.edu for Longmont Weather Station.
[4]Equals Column(3)times 70 percent.70 percent value was taken from SB 120.
[5]Equals Column(2)minus Column(4).If the resultant value is less than zero then a zero is substituted.
[6]Equals Column(5)divided by 12 times 6.18 acres.Includes Pond 1(5.18 ac),and 1 acre of sump and dewatering in Pond 4.
[7]Based on information from Hall-Irwin.
[8]Equals Column(7)times 400,000 tons per year.Production based on information from Besfway.
[9]Equals Column(2)times 2000 times 4%divided by 62.4 divided by 43,560.The provisional leak test for Pond 4was
apporved and the other miming areas are also approved slurry lined cells,therefore no water is lost in production of the
aggregate.
[10]Based on information from Bestway.
[11]Equals Column(10)times zero cy per year.
[12]Equals Column(11)times 40 gallons druided by 325851.Assume a use of 40 gallons per cubic yard of concrete production.
[13]Equals 3,953 gallons per day times number of operating days(30.5 days)in the month divided by 325,851,during production months.
[14]Equals Column(6)plus Column(9)plus Column(12)plus Column(13).
BERN SWSP2022.xls Civil Resources,LLC,9/7/2021