2012-02-02_HYDROLOGY - M1977439

• Permit No: M1977439
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/2/2012
• Doc Name: SWSP
• From: OSE
• To: Tri-Districts
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

Table 2
Tri- Districts and City of Greeley
Home Office Pit SWSP, M -77 -439 - Part A
Calculative Evaporative Losses at Lamb A, B, and C
Total Exposed Water Surface =
Pre -1981 Exposed Surface Area=
Augmented Water Surface =
Annual Precipitation =
Gross Annual Evaporation =
Notes:
83.9
22.1
61.8
15.12
38
acres
acres
acres
inches - Taken from Fort Collins Weather Station
inches - Taken from NOAA Technical Report NWS 33
(1) Based on SEO SB120 guidelines for evaporation rates at elevations below 6500 feet.
(2) Based on NOAA Technical Report NWS 33 and distributed according to SEO SB120 guidelines, Column 1 *(Gross evaporation /12)
(3) Based on Climate data from the Fort Collins Weather Station from CDSS
(4) Assumes 70% effective precipitation, (Column 3 * 0.70)/12
(5) Net lake evaporation from water surface areas, Column 2 - Column 4
(6) Total lake evaporation = Column 5 net lake evap.* total exposed water surface
(1)
(2)
(3)
(4)
(5)
(6)
Month
Percent of Annual
Evaporation
Gross Lake
Evaporation
(ft)
Annual Precipitation
(in)
Effective Precipitation
(ft)
Net Lake Evaporation
(ft)
Total Lake
Evaporation
P
(AF)
Nov
4.0%
0.13
0.59
0.03
0.09
5.70
Dec
3.0%
0.10
0.49
0.03
0.07
4.10
Jan
3.0%
0.10
0.36
0.02
0.07
4.57
Feb
3.5%
0.11
0.48
0.03
0.08
5.12
Mar
5.5%
0.17
1.20
0.07
0.10
6.44
Apr
9.0%
0.29
1.98
0.12
0.17
10.48
May
12.0%
0.38
2.72
0.16
0.22
13.68
Jun
14.5%
0.46
1.83
0.11
0.35
21.78
Jul
15.0%
0.48
1.60
0.09
0.38
23.59
Aug
13.5%
0.43
1.44
0.08
0.34
21.23
Sep
10.0%
0.32
1.30
0.08
0.24
14.88
Oct
7.0%
0.22
1.13
0.07
0.16
9.63
Totals
100.0%
3.17
15.12
0.88
2.28
141.19
Table 2
Tri- Districts and City of Greeley
Home Office Pit SWSP, M -77 -439 - Part A
Calculative Evaporative Losses at Lamb A, B, and C
Total Exposed Water Surface =
Pre -1981 Exposed Surface Area=
Augmented Water Surface =
Annual Precipitation =
Gross Annual Evaporation =
Notes:
83.9
22.1
61.8
15.12
38
acres
acres
acres
inches - Taken from Fort Collins Weather Station
inches - Taken from NOAA Technical Report NWS 33
(1) Based on SEO SB120 guidelines for evaporation rates at elevations below 6500 feet.
(2) Based on NOAA Technical Report NWS 33 and distributed according to SEO SB120 guidelines, Column 1 *(Gross evaporation /12)
(3) Based on Climate data from the Fort Collins Weather Station from CDSS
(4) Assumes 70% effective precipitation, (Column 3 * 0.70)/12
(5) Net lake evaporation from water surface areas, Column 2 - Column 4
(6) Total lake evaporation = Column 5 net lake evap.* total exposed water surface