2014-12-11_HYDROLOGY - M1979059

• Permit No: M1979059
• IBM Index Class Name: Hydrology
• Doc Date: 12/11/2014
• Doc Name: SWSP
• From: DWR
• To: Weiland, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: MAC
• Media Type: D
• Archive: No

Peter Wayland Page 2 of 7
Brownwood SWSP
December 11, 2014
accordance with approach no. 4 you have dedicated 0.24 shares of the Big Thompson Ditch Et
Manufacturing Co. ("BTDMC") (WDID 0104503) water rights to this SWSP, and up to the entire
5/6 of a share in the BTDMC water right owned by the Applicant, which can and will be used
in the court augmentation plan, unless a sufficient alternative replacement source is
identified and dedicated.
Depletions
The anticipated net depletion for this plan is 27.35 acre-feet per year for up to 12.8
acres of exposed ground water. Gross evaporation at this site is taken from NOAA TR-33 Map 3
and is estimated to be 39 inches per year with an effective precipitation amount of 10.58
inches. Computation of evaporation under this plan was also reduced during the ice covered
period. You have assumed the ice covered period to occur during the months of January,
February and December, based on the average temperatures of 27.5°F for January, 30.6°F for
February and 29.1°F for December; taken from the Fort Collins weather station. However, for
the purpose of this SWSP, the Applicant shall replace the net evaporation depletions from the
exposed ground water surface area that may occur during the assumed ice covered period (the
months of January, February and December) for any time that the pit is not completely covered
by ice.
The lagged depletions from evaporation at the Brownwood Pit were estimated by the
Applicant's consultant using the Integrated Decision Support group's Alluvial Water
Accounting System (IDS AWAS) stream depletion model. The aquifer characteristics used in
the model are: transmissivity (T) = 44,883 gallons per day per foot, specific yield (SY) = 0.2,
the distance from the centroid of the exposed ground water to the stream = 798 feet, and the
location of the parallel impermeable boundary was estimated to be 2,000 feet from the
stream.
The stream depletion model was taken to a steady state condition and shows that the
stream depletions will equal the yearly total evaporation of 27.35 acre-feet at a monthly rate
as shown in the attached Table Al.1. The point of depletion is on the Big Thompson River in
the E1/2 of Section 19, where the farm borders the river.
Replacements
The proposed source of replacement for this pit includes historical consumptive use
credit from 0.24 shares of BTDMC water rights from the dry-up of 16.76 acres of land, and a
water lease with the City of Loveland ("Loveland"). The applicant has a 25-year Water lease
with the Loveland for 100 acre-feet of fully consumable water which is used for replacement
purposes for six gravel pits operated by the Applicant, including the Brownwood Pit.
Loveland will deliver this water to the Big Thompson River at their waste water treatment
plant (WDID 0402300) which is adjacent to the Brownwood Pit. Therefore a transit loss will
not be assessed on releases made for this plan. Transit losses are subject to change at the
water commissioner's discretion. The monthly depletion and replacement requirements,
based on an average year are found on the attached Table AI.4.
Under the terms of the Loveland lease, replacements can be made using a variety of
water owned by Loveland including, but not limited to, Windy Gap reusable effluent,