2014-02-13_HYDROLOGY - M1986015

• Permit No: M1986015
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/13/2014
• Doc Name: Substitute water supply plan
• From: Division of Water Resources
• To: Bishop Brogden Associates, Inc.
• Email Name: TC1
• Media Type: D
• Archive: No

Mr. Paul Bruss, E.I.
February 11, 2014
Page 2
approved plan for augmentation or SWSP approved by the State Engineer, whichever is more
restrictive).
DEPLETIONS
Annual site depletions consist of 90.9 acre -feet of evaporative losses, 21.4 acre -feet of
pumping for dust control, and 29.4 acre -feet of water removed in the mining product, for a total
depletion of 97.1 acre -feet for each of the plan years (February 1, 2012 — January 31, 2013 and
February 1, 2013 — January 31, 2014). The monthly distribution of the values and the lagged
effects on the Arkansas River, are detailed on your Tables 1 -4, which are attached. The lagged
depletions were calculated individually for each Phase of the operation based on the
characteristics below.
Location
Transmissivity
Specific Yield
Distance to
Distance to
Alluvial
49.15%
(gpd /ft)
76.62%
River (ft)
Boundary ft
Phase 1
97,100
0.15
1,032
2,647
Phase 2
97,100
0.15
964
2,206
Phase 7
97,100
0.15
420
2,250
Lagging factors for each of the Phases were calculated using the Glover Method,
normalized to the number of months required for 95% of depletions to affect the river, and are
provided in the following table.
Month
Phase 1
Phase 2
Phase 7
1
49.15%
54.46%
76.62%
2
34.43%
36.62%
19.16%
3
11.76%
8.92%
4.22%
4
4.65%
-
-
Historical phreatophyte and effective precipitation were determined to partially offset
gross evaporation at the site. The credit from historical phreatophyte consumptive use was
calculated to be 19.5 acre -feet per year from 5.6 acres of equivalent 100% canopy cover native
vegetation in Phase 1, and 17.5 acre -feet per year from 5 acres of 100% canopy cover native
vegetation in Phase 7. Effective precipitation was claimed on the remaining 11.1 acres of
exposed surface area, and was calculated as 70% of total precipitation.
REPLACEMENT
The replacement water is proposed to be from three sources. The first is Transit Mix's
ownership of 2.92 cfs of the Hamp -Bell ditch that historically irrigated 67 acres and is estimated
to yield 170.3 acre -feet annually in an average year and 153.9 acre -feet annually in a dry year.
The second is consumable water leased from the Pueblo Board of Water Works (PBWW).
Transit Mix currently has a lease with Pueblo that will provide 120 acre -feet of totally
consumable water annually through September 30, 2022, a copy of which is attached. The
third is 60 shares of Twin Lakes Reservoir water owned by Transit Mix that are primarily used
for Transit Mix's Grisenti Pit under a separate SWSP, but typically provide 25 to 35 acre -feet of
excess water.