New in GWRP

Regional Groundwater Studies
- Ground-Water Availability in the United States
Water Availability Pilot
- Consumptive water use coefficients for Great Lakes Basin
Groundwater & the Environment
- Ground-Water Recharge in Southwestern US
Methods & Modeling
- SEAWAT v4--Simulation of 3D variable-density ground--water flow and transport
Data & Information
- Water-Level changes in aquifers of the Atlantic Coastal Plain, predevelopment to 2000

USGS in Your State

USGS Water Science Centers are located in each state.

Table 1. Recent studies illustrate the application of this method -- click site name for details:

	Minnesota Surficial Aquifers Delin and others, (2007)	North Carolina Coastal Plain Coes and others, (2007)	Pennsylvania Fractured Rock Site Risser and others (2005)
Description	Humid, flat to rolling hills, glacial deposits, agricultural and forested land	Humid, coastal plain physiographic province, low relief, sandy soils, mixed urban and agricultural land	Humid, rolling hills in Appalachian Plateaus province, fractured rock, agricultural and forested land
Depth to water table	1-15 m	~1-8 m	1-30 m
Mean annual precipitation	70 cm	127 cm	107 cm
WTF recharge (as % of precip)	6-56 (21)	25-94 (56)	19-48 (24)
Age-dating of groundwater recharge (as % of precip)	7-49 (24)	2-36 (12)	NA
Rorabaugh equations (as % of precip)	8-44 (19)	16-27 (24)	(33)

NA, not available

U.S. Department of the Interior | U.S. Geological Survey
URL: http://water.usgs.gov/ogw/gwrp/methods/wtf/table1.html
Page Contact Information: Contact the Groundwater Resources Program
Page Last Modified: Thursday, 03-Jan-2013 20:07:11 EST