WHAT WE KNOW

There have been studies done for the Greybull Valley irrigation district in the past.  These studies can be found at http://library.wrds.uwyo.edu .  I will be listing all pertinent information found on these studies here so that it can be used to build a project model.

There are restrictions that we must adhere to on this project.  A certain level must be maintained in the reservoirs (head).  Specifed flow rates must be maintained in the rivers after water is diverted to the reservoirs, the flow rates are in cubic feet per second (cfs).


Total irrigated acres: 80,000
Total storage capacity (all 3 reservoirs): 143,000 acre-ft
Irrigation season: April - October
Diversion to Upper: 900 cfs
Wood River diversion: 600 cfs
Sunshine creek: 250 cfs, 500 cfs with erosion protection
Avg diversion into upper (April -October): 53, 300, 601, 502, 307, 141, 59 cfs
Average diversion into lower: 67 472, 835, 674, 395, 187, 85 cfs
Roach Gulch Dam:
 Max gross head: 147 ft
 Avg. daily gross head: 100 ft April-July
                                    80 ft August
                                    65 ft September
                                    60 ft October
Upper Sunshine Dam:
 Max gross head: 150 ft
 Avg daily gross head: 122 ft all months


Lower Sunshine Dam:
 Max gross head: 170 ft
 Avg daily gross head: 139 ft all months


This information along with gaging station information in the Greybull and Wood rivers will be used to build a model representing likely fill and release procedures.  This model will determine if this project is economically feasible.