2018-11-07_HYDROLOGY - M1982131

• Permit No: M1982131
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/7/2018
• Doc Name: Substitute Water Supply Plan
• From: DWR
• To: Applegate Group, Inc. / Bucklen Equipment Company, Inc.
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

Bucklen Pit SWSP November 7, 2018
Plan ID 3183 Page 4 of 9
In paragraph 6.7.4 of the decree in case no. 1996CW658, future farm headgate deliveries of
Poudre Prairie's 67.75 shares were limited to 1,712 acre-feet per year (25.26 acre-feet per share),
and 12,631 acre-feet (186.43 acre-feet per share) in any consecutive 10-year period. Deliveries of
the Applicant's six shares of GIC water under this plan must comply with these per-share limits. The
historical return flows shall be maintained in accordance with the return flow factors identified in
case no. 1996CW658. The return flows associated with the delivery of Fossil Creek Reservoir water
that is attributable to the Applicant's six GIC shares shall also be maintained in accordance with the
surface and subsurface factors decreed in case nos. 1996CW658.
Pursuant to paragraph 6.7.6 of case no. 1996CW658, the subsurface component of the return
flow obligation will be calculated based on the 5-year running average annual farm headgate
deliveries of GIC direct flow water and Fossil Creek Reservoir water. You have proposed to calculate
subsurface return flow obligations based on the 5-year running average deliveries of the subject
shares. The total annual deliveries of the subject GIC shares for the last five years are shown in the
following table. For the purposes of this SWSP, you have estimated the 5-year average for Water
Year 2018 using the projected deliveries per share for Year One as described in paragraph 28 of the
decree entered in case no. 2003CW348 for those months for which delivery records are not yet
available (August, September, and October 2018). The actual subsurface return flow obligations will
be based on the average of actual deliveries for the period of 2014-2018.
Total Annual Deliveries
Water Total Annual Delivery (acre-feet)
Year GIC Direct Flow Fossil Creek
Reservoir
2014 26.66 0
2015 26.50 0
2016 71.42 0
2017 79.30 0
2018 103.98 4.74
Average 61.57 0.95
This approach will be accepted for this plan period; however, since you have proposed to rely on the
ditch-wide analysis in case no. 1996CW658, for any future SWSP this 5-year average should
consider all diversions, not just those of the subject shares, and should be obtained by GIC and
included in the accounting.
As specified in case no. 1996CW658, all deliveries of GIC water incur a return flow obligation
to the stream system made up of a surface and subsurface component. Surface return flows will be
calculated by multiplying the GIC direct flow water by 0.237 (23.7%) and any Fossil Creek Reservoir
Water delivered by 0.201 (20.1%). As described above, the subsurface component of the return flow
obligation will be calculated by multiplying the 5-year average annual delivery of GIC water by the
monthly subsurface return flow factors given in Appendix A-2 of the decree entered in case no.
1996CW658 (see Table 4). As shown in Table 4, the estimated subsurface return flow obligations for
GIC direct flow deliveries and Fossil Creek reservoir deliveries total 14.78 acre-feet and 0.20
acre-feet, respectively. The quantity of GIC water remaining after the Applicant has satisfied its
return flow obligations is equivalent to the historical consumptive use attributable to the shares.
For the purposes of this SWSP, you have used a projected yield of 20.31 acre-feet of GIC
direct flow water per share and 1.19 acre-feet of Fossil Creek Reservoir deliveries per share. These