Input Values

7.85 R Recharge rate (permeability rate) (in/hr)

Specific yield, Sy (dimensionless)

Horizontal hydraulic conductivity (in/hr)

39.25 Kh Kh = 5xRecharge Rate (R) in the costal plan; Kh=R outside the coastal plan

24.670 x 1/2 length of basin (x direction, in feet)

3.830 y 1/2 width of basin (y direction, in feet)

6.71 t Duration of infiltration period (hours)

34.00 hi(0) Initial thickness of saturated zone (feet)

0.150 Sy default value is 0.15; max value is 0.2 provided that a lab test data is submitted

h(max) Maximum thickness of saturated zone (beneath center of basin at end of infiltration period)

Δ h (max) Maximum groundwater mounding (beneath center of basin at end of infiltration period)

Ground-water Distance from center of basin in x

Mounding, in feet direction, in feet

0.820 0

0.792 10

0.694 20

0.512 30

0.393 40

0.312 50

0.252 60

0.205 70

0.168 80

0.137 90

Re-Calculate Now

0 10 20 30 40 50 60 70 80 90 100

This spreadsheet solving the Hantush (1967) equation for ground-water mounding beneath an infiltration basin is made available to the general public as a convenience for those wishing to replicate values documented in the USGS Scientific Investigations Report 2010-5102 "Groundwater Mounding beneath Hypothetical Stormwater Infiltration Basins" or to calculate values based on user-specified site conditions. Any changes made to the spreadsheet (other than values identified as user-specified) after transmission from the USGS could have unintended, undesirable consequences. These consequences could include, but may not be limited to: erroneous output, numerical instabilities, and violations of underlying assumptions that are inherent in results presented in the accompanying USGS published report. The USGS assumes no responsibility for the consequences of any changes made to the spreadsheet. If changes are made to the spreadsheet, the user is responsible for documenting the changes and justifying the results and conclusions.