C150290 Approval letter - Laserfiche WebLink

Home Browse Search

Joseph W. Bowles Reservoir Company May 12, 2009 (UPDATED May 22, 2009) Page 4 of 6 Table 1. Water Rights Agenda Item 17c Appropriation Adjudication Amount Bowles No. 1 Decreed Water Right Use Date Date Ca aci Use All Bowles ~ Systems 5/10/1876 2/4/1884 11.06 cfs 2,110.5 AF Irrigation Reservoirs All Bowles Systems 5/15/1880 2/4/1884 15.75 cfs 2,110.5 AF Irrigation Reservoirs Joseph W. Bowles No. 1 Reservoir 3/9/1883 9/24/1935 33.19 cfs 362.56 AF Irrigation Enlar ement The Reservoir has the second-most senior reservoir storage decree on the main stem of Bear Creek and down the South Platte River to the state line. As such, it is generally expected to fill each year. Records show that the Reservoir is filled to or near maximum capacity during most years and undergoes moderate drawdown each year. The net yield released from the Reservoir to shareholders has historically averaged about 2.2 acre-feet per share (or roughly 900 AF). Project Description While the Reservoir is not currently operating under a fill restriction, the Company wants to complete this Project to correct dam-safety deficiencies and to rehabilitate the deteriorating inlet ditch to the Reservoir. Three alternatives were considered for this Project: 1. The no-action alternative; 2. Dam rehabilitation and ditch rehabilitation; 3. Dam reconstruction and ditch rehabilitation. Alternative No. 1- This alternative was considered unacceptable because it is expected that the SEO would eventually impose a storage restriction on the dam, thereby affecting future water use and storage. Selected Alternative No. 2-This alternative would include widening the crest, reconstructing the upstream slope, and installing a seepage collection and toe drain system on the downstream slope. Work on the inlet ditch includes removing trees, reconstructing the ditch cross section and alignment, placing slope protection in high erosion areas, and installing a flow control pipe that will provide for discharge of excessive ditch flows into an existing spillway and drainage structure. The cost for this alternative is estimated to be $1,874,000. Alternative No. 3- This alternative would require full removal and complete rebuilding of the dam. The new dam would be similar in cross section to Alternative No. 2. The inlet work would also be the same as listed in Alternative No. 2. The cost for this alternative is estimated to be $3,020,000.