CW DMAG Update - May 31, 2007 Low Inflow Protocol (LIP) Drought Indicators
The C-W Basin is in a Stage 0 Watch Stage. This is the same stage as last month, but the all LIP drought indicators have significantly worsened since last month.
The following are the Low Inflow Protocol (LIP) drought indicators as of May 31, 2007:
Storage Indicator (SI): 71.99%
Target Storage Index = 75.00%
Ratio = 95.99% (Supports Stage 0) Last Month= 100.80% (Normal)
Streamflow Indicator (six-month average versus historical six-month average):
Ratio = 88.6% (Supports Normal) Last Month = 99.7% (Normal)
US Drought Monitor (three-month average)
Three-month Numeric Average = +1.33 (Supports Stage 1) Last Month = +0.33 (Stage 0)
USGS Langtree current reading = 18.13 ft (Normal) 8.21 is the Stage 0-Watch Level
USGS Linville current reading = 2.24 ft (Stage 2) 2.04 is the Stage 0-Watch Level
NCDWR Glen Alpine reading = 8.56 (Stage 1) 7.69 is the Stage 0-Watch Level
The C-W Basin was in a Stage 0, Low Inflow Watch at the end of April, 2007, and all indicators are moving in the direction of higher LIP stages. The trend for the indicators is in the direction of increasing dryness with the Drought Monitor indicator now in a Stage 1. The Storage Index (SI) reading is reflective of the fact that Duke Energy has reduced the hydro generation in order to maintain lake levels near Target Elevations. However, the trend is downward as reflective of no recent significant inflow. The Streamflow Indicator is still in the Normal condition, but is quickly trending downward as earlier normal flow months drop out of the average and dry months are added.
As discussed previously, since we are operating under the existing license, the LIP is voluntary at this time. However, Duke recommends that all adhere as best as possible to the provisions of the LIP. Please refer to Appendix C of the Comprehensive Relicensing Agreement for the official LIP requirements.