Precipitation.
Reservoir.
Streamflow
Streamflow forecasts are below average as of June 1. Deerfield Reservoir inflow is forecast at 750 acre feet (42
percent of average). Pactola is forecast at 1,500 acre feet (17 percent of average). This is for the June – July
runoff period.
================================================================================================================================== BELLE FOURCHE & CHEYENNE RIVER BASINS Streamflow Forecasts - June 1, 2001 ================================================================================================================================== | <<====== Drier ====== Future Conditions ======= Wetter =====>> | | | Forecast Point Forecast | ==================== Chance Of Exceeding * ====================== | Period | 90% 70% | 50% (Most Probable) | 30% 10% | 30-Yr Avg. | (1000AF) (1000AF) | (1000AF) (% AVG.) | (1000AF) (1000AF) | (1000AF) ====================================================================|=======================|===================================== DEERFIELD RESERVOIR Inflow JUN-JUL 0.18 0.52 | 0.75 42 | 1.30 2.11 1.80 | | PACTOLA RESERVOIR Inflow JUN-JUL 0.03 0.90 | 1.50 17 | 5.01 10.17 9.00 | | ================================================================================================================================== BELLE FOURCHE & CHEYENNE RIVER BASINS | BELLE FOURCHE & CHEYENNE RIVER BASINS Reservoir Storage (1000 AF) - End of May | Watershed Snowpack Analysis - June 1, 2001 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= ANGOSTURA 122.1 114.8 119.9 117.2 | BELLE FOURCHE 1 0 0 | BELLE FOURCHE 178.4 184.5 190.5 152.3 | | DEERFIELD 15.2 15.1 15.1 13.6 | | KEYHOLE 193.8 169.9 176.0 113.6 | | PACTOLA 55.0 54.3 54.7 48.6 | | SHADEHILL 81.4 77.8 56.2 68.7 | | ================================================================================================================================== * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table. The average is computed for the 1961-1990 base period. (1) - The values listed under the 10% and 90% Chance of Exceeding are actually 5% and 95% exceedance levels. (2) - The value is natural volume - actual volume may be affected by upstream water management.