U.S. Geological Survey, Water Resources of Pennsylvania

U.S. GEOLOGICAL SURVEY

Drought-Sensitive Aquifer Settings in Southeastern Pennsylvania

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Revisions, November 7, 2005 (version 1.1)

Figure 1, p. 3, Base credits

Revised from:
Base from Sevon, 2000, scale 1:2,000,000

to:
Physiography from Sevon, 2000
Base from U.S. Geological Survey digital-line data, 2001, 1:1,000,000, Universal Transverse Mercator projection zone 18, central meridian 75 degrees 00 seconds W.
Shaded relief prepared from U.S. Geological Survey National Elevation Dataset, 2004

Figure 4, p. 11, Base credits

Revised from:
Base from Sevon, 2000, scale 1:2,000,000

to:
Base from U.S. Geological Survey digital-line data, 2001, 1:1,000,000, Universal Transverse Mercator projection zone 18, central meridian 75 degrees 00 seconds W.
Shaded relief prepared from U.S. Geological Survey National Elevation Dataset, 2004

Figure 6, p. 14-15, Base credits

Revised from:
Base from Sevon, 2000, scale 1:2,000,000

to:
Base from U.S. Geological Survey digital-line data, 2001, 1:1,000,000, Universal Transverse Mercator projection zone 18, central meridian 75 degrees 00 seconds W.
Shaded relief prepared from U.S. Geological Survey National Elevation Dataset, 2004

Table 7, p. 18

Revised from:

Table 1. Comparison of drought-affected wells (1999 and 2002 droughts) in Chester and Montgomery Counties, Pennsylvania, in nine settings defined as the intersection of water-table decline (WTD) index and topographic position.

[
    highly drought sensitive;    moderately sensitive;    low sensitivity]
Topographic position
  
WTD INDEX
  
Low
Moderate
High
Basis of Comparison—Drought-affected wells per 100 square mile
Valley
44
54
69
Slope
63
81
118
Upland
74
141
195
Basis of Comparison—Drought affected wells as a percentage of
Water Well Inventory wells.
Valley
2.9
9.9
8.0
Slope
4.2
9.8
10.3
Upland
4.5
13.4
15.3


to:

Table 1. Comparison of drought-affected wells (1999 and 2002 droughts) in Chester and Montgomery Counties, Pennsylvania, in nine settings defined as the intersection of water-table decline (WTD) index and topographic position.

[
    low sensitivity;    moderately sensitive;    highly drought sensitive]
Topographic position
  
WTD INDEX
  
Low
Moderate
High
Basis of Comparison—Drought-affected wells per 100 square mile
Valley
44
54
69
Slope
63
81
118
Upland
74
141
195
Basis of Comparison—Drought affected wells as a percentage of
Water Well Inventory wells.
Valley
2.9
9.9
8.0
Slope
4.2
9.8
10.3
Upland
4.5
13.4
15.3


Figure 9, p. 19, Base credits

Revised from:
Base from Sevon, 2000, scale 1:2,000,000

to:
Base from U.S. Geological Survey digital-line data, 2001, 1:1,000,000, Universal Transverse Mercator projection zone 18, central meridian 75 degrees 00 seconds W.
Shaded relief prepared from U.S. Geological Survey National Elevation Dataset, 2004

This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.

View the full report in PDF

For more information about USGS activities in Pennsylvania contact:
Director
USGS Pennsylvania Water Science Center
215 Limekiln Road
New Cumberland, Pennsylvania 17070
Telephone: (717) 730-6960
Fax: (717) 730-6997
or access the USGS Water Resources of Pennsylvania home page at:
http://pa.water.usgs.gov/.

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