Simplified Solution for Groundwater Mounding under Round Stormwater Infiltration Facilities

A study was conducted to derive new groundwater mounding equations that are simple in their structures but produce reasonable values for conditions most commonly found in stormwater infiltration facilities. This paper presents the new simplified equations and their theoretical development. The equations apply to Steady-uniform recharge rate to infinite homogenous aquifers with initially horizontal water table and bedrock surfaces. Separate sets of equations were derived for recharge strips (infiltration channels/trenches) and infiltration basins (round or square facilities). The equations for recharge strips were published previously. This paper presents the equations for round or square facilities. The new equation sets require minimum input data in terms of the size and shape of the facility, the properties of the saturated layer and the recharge rate and are convenient for routine engineering calculations. Example applications of the new equation sets for conditions typical in New Jersey are presented.