2015-01-22_HYDROLOGY - M1980110

• Permit No: M1980110
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/22/2015
• Doc Name: Substitute Water Supply Plan
• From: DNR Water Resources
• To: Bishop-Brogden Associates, Inc.
• Email Name: TOD
• Media Type: D
• Archive: No

Table 1
E-470 Public Highway Authority
Sandy Acres Pit SWSP
Total Maximum Evaporation
Total Exposed Surface Area* in acres): 33.02
Month
Gross
Evaporation
(inches)
Average
Annual
Precipitation
(inches)
Effective
Precipitation
inches
Net
Evaporation
(inches
Net
Evaporation
(feet)
Total Net
Pond
Evaporation
(ac -ft )
Total Lagged
Net Pond
Evaporation
(ac -ft
Oct -14
(1)
3.13
(2)
0.88
(3)
0.62
4
2.51
5)
0.21
6)
6.91
(7)
9.39
Nov -14
1.79
0.75
0.53
1.26
0.11
3.47
8,78
Dec -14
1.34
0.48
0.33
1.01
0.08
0
7.83
Jan -15
1.34
0.42
0.29
1.05
0.09
0
6.71
Feb -15
1.56
0.38
0.27
1.30
0.11
3.56
5.91
Mar -15
2.46
1.11
0.78
1.68
0.14
4.62
5.74
Apr -15
4.02
1.69
1.18
2.84
0.24
7.82
5.85
May -15
5.36
2.30
1.61
3.76
0.31
10.34
6.34
Jun -15
6.48
1.54
1.08
5.40
0.45
14.86
7.17
Jul -15
6.70
1.51
1.06
5.64
0.47
15.53
8.26
Aug -15
6.03
1.61
1.12
4.91
0.41
13.51
9.18
Sep- 15
4.47
1.13
0.79
3.68
0.31
10.11
9.56
Total
44.69
13.80
9.66
35.03
2.92
90.72 1
90.72
Notes:
• The total exposed surface area of the Sandy Acres Pit is based upon data provided by Western States Surveying (from June 14, 2012 survey) and assumes
the pit is full (33.02 acres of exposed area ) for the entire SWSP period.
(1) Total gross evaporation is based upon NOAA Technical Report NWS 33 and is distributed according to Senate Bill 89 -120 criteria for sites below 6,500
feet in elevation:
(2) Average precipitation at the Bright
Jan:
3.0%
Jul:
15.0%
Feb:
3.5%
Aug:
13.5%
Mar:
5.5%
Sep:
10.0%
Apr:
9.0%
Oct.
7.0%
May:
12.0%
Nov:
4.0%
Jun:
14.5%
Dec:
3.0%
on 1 NE, CO (1D# 0950) NOAA weather station from 1974-201 3
(3) Assumed 70% effective precipitation. (3) is equal to (2) x 70 %.
(4) is equal to (1) - (3).
(5) is equal to (4)/12 inches.
(6) Net Pond Evaporation is equal to net evaporation in feet (5) x total exposed surface area of the pond. Note that evaporation is assumed to equal zero in
December and January because the average daily temperature at the Brighton l NE, CO (m #USC00050950) NOAA weather station is below freezing.
(7) Lagged depletions based on IDS AWAS Glover Analysis using the following parameters (assuming steady -state conditions):
Harmonic Transmissivity:78,729 gallons/day /foot
Specific Yield: 0.2
Aquifer Width: 12,172.6 feet
Distance from centroid of pit to river: 3,173.4 feet
Sandy Acres SWSP Evaporation Estimate.xlsx
BBA TI -Total Evap
�. i.�. AlfNOP OAOCrOIN AfSOC/ATli. INC 10/9/2014