241220_42 ERW_Stormwater Report FULL

Input Values 0.50 R Recharge rate (permeability rate) (in/hr) 0.150 Sy 0.50 Kh 71.000 x 1/2 length of basin (x direction, in feet) 17.000 y 1/2 width of basin (y direction, in feet) 18.60 t Duration of infiltration period (hours) 10.00 hi(0) Initial thickness of saturated zone (feet) 14.929 h(max) Maximum thickness of saturated zone (beneath center of basin at end of infiltration period) 4.929 Δh(max) Maximum groundwater mounding (beneath center of basin at end of infiltration period) Ground-water Mounding, in feet Distance from center of basin in x direction, in feet 4.929 0 4.929 10 4.929 20 4.929 30 4.927 40 4.889 50 4.556 60 2.833 70 0.487 80 0.043 90 Disclaimer 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. Horizontal hydraulic conductivity (in/hr) Kh = 5xRecharge Rate (R) in the costal plan; Kh=R outside the coastal plan Specific yield, Sy (dimensionless) default value is 0.15; max value is 0.2 provided that a lab test data is submitted Re-Calculate Now 0.000 1.000 2.000 3.000 4.000 5.000 6.000 0 10 20 30 40 50 60 70 80 90 100 Groundwater Mounding, in feet This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.