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CW DMAG Update - September 21, 2007 Low Inflow Protocol (LIP) Drought Indicators

The following are the Low Inflow Protocol (LIP) drought indicators as of September 21, 2007:

Storage Index (SI): 46.74%
Target Storage Index = 75.00%
Ratio = 62.32% (Supports Stage 2 (note: Stage 3 ratio threshold is 57% for September)   

Trend Data:
SI on July 30, 2007 = 64.36%
SI on August 27, 2007 = 53.54%
SI on August 31, 2007 = 52.58%
SI on September 7, 2007 = 50.26%
SI on September 14, 2007 = 47.56%
SI on September 21, 2007 = 46.74%
Loss Rate since July 30, 2007 =  2.33% per week
Loss Rate since August 31, 2007 = 1.95% per week

Streamflow Indicator (six-month average versus historical six-month average):
Ratio = 47.70% (Supports Stage 3)       

Trend Data:
Ratio on July 30, 2007 = 66.6%
Ratio on August 31, 2007 = 64.0%

US Drought Monitor (three-month average assuming current reading for September)
Three-month Numeric Average = +2.33 (Supports Stage 2)

Groundwater Gages (feet below surface):
USGS Langtree current reading = 21.38 ft
August 31, 2007 reading = 20.85 ft
September 7, 2007 reading =  21.10 ft
September 14, 2007 reading = 21.24 ft

USGS Linville current reading = 2.37 ft                          
August 31, 2007 reading = 2.41 ft
September 7, 2007 reading =  2.43 ft
September 14, 2007 reading = 2.49 ft

NCDWR Glen Alpine reading = 9.98 ft
(reading on September 20, 2007)
August 15, 2007 reading = 9.90 ft
September 5, 2007 reading = 10.03 ft
September 13, 2007 reading = 10.19 ft