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Groundwater Resources Program
Comparison of Selected Methods for Estimating Groundwater Recharge In Humid Regions
Sorted by Method
Select Methods to Compare
METHOD
CATEGORY
SPATIAL SCALE
TEMPORAL SCALE
TYPICAL QUANTITY ESTIMATED
EASE OF USE
DATA NEEDS
RELATIVE COST
Chloride
Tracer
Point
Years
Recharge
Easy
Moderate
Moderate
Chlorofluorocarbons
Tracer
Local
Month to Years
Recharge
Difficult
Moderate
High
Darcian Unit-Gradient
Unsaturated Zone
Point
Long-Term Average
Potential Recharge
Moderate
Low
High
Deep Percolation Model
Water Budget
Regional
Day to Years
Potential Recharge
Moderate
Moderate
Moderate
Groundwater Modeling
Groundwater
Local to Regional
Month to Years
Recharge
Moderate
High
High
HELP3 Model
Water Budget
Point to Regional
Day to Years
Potential Recharge
Easy
Low to Moderate
Moderate
Recession-Curve Displacement
Streamflow
Watershed
Event to Years
Net Recharge
Moderate
Low
Low
Seepage Meters
Streamflow
Point
Event to Months
Potential Recharge
Moderate
Low
Low
Stream Base-Flow
Streamflow
Watershed
Years
Net Recharge
Easy
Low
Low
Streamflow Gain/Loss Measurements
Streamflow
Local
Instantaneous
Potential Recharge
Easy
Low
Low
Temperature
Tracer
Point
Days to Years
Recharge
Moderate
Moderate
High
Tritium
Tracer
Point
Month to Years
Recharge
Moderate
Moderate
High
Watershed Models
Streamflow
Watershed to Regional
Days to Years
Recharge
Moderate
High
High
Water-Table Fluctuations
Groundwater
Local
Day to Years
Recharge
Easy
Low
Low
Zero-Flux Plane
Unsaturated Zone
Point
Day to Years
Potential Recharge
Difficult
High
High
Zero-Tension Lysimeters
Unsaturated Zone
Point
Day to Years
Potential Recharge
Difficult
Low
High