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ARCHIVED GROUND-WATER MODELS

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Program to Maintain and Update Groundwater Models
Groundwater Mounding

Simulation of Groundwater Mounding beneath Hypothetical Stormwater Infiltration Basins

By Glen B. Carleton

Map of New Jersey showing the model's study area

STATUS: Archived

MODEL TYPE/VERSION:MODFLOW-2000, transient

AREA STUDIED:Hypothetical stormwater infiltration basins for 1-acre and 10-acre developments

AQUIFERS SIMULATED: Hypothetical confined aquifers

MOST RECENT WITHDRAWALS SIMULATED: none

MODEL SIZE:
1-acre development--3 layers, 410 rows, 475 columns
10-acre development--3 layers, 560 rows, 568 columns

MINIMUM GRID SPACING:
1-acre development—0.15 meters X 0.15 meters
10-acre development—0.5 meters X 0.5 meters

REPORT SERIES AND NUMBER:http://pubs.er.usgs.gov/usgspubs/sir/sir20105102

Download this set of model files Archived model files are available.

Report Abstract

Groundwater mounding occurs beneath stormwater management structures designed to infiltrate stormwater runoff. Concentrating recharge in a small area can cause groundwater mounding that affects the basements of nearby homes and other structures. Methods for quantitatively predicting the height and extent of groundwater mounding beneath and near stormwater infiltration structures can be used by property developers and regulatory agencies to assessthe threat to previously existing or proposed structures.

Finite-difference groundwater-flow simulations of infiltration from hypothetical stormwater infiltration structures (which are typically constructed as basins or dry wells) were done for 10-acre and 1-acre developments. Aquifer and stormwater-runoff characteristics in the model were changed to determine which factors are most likely to have the greatest effect on simulating the maximum height and maximum extent of groundwater mounding. Aquifer characteristics that were changed include soil permeability, aquifer thickness, and specific yield. Stormwater-runoff variables that were changed include magnitude of design storm, percentage of impervious area, infiltration-structure depth (maximum depth of standing water), and infiltration-basin shape. Values used for all variables are representative of typical physical conditions and stormwater management designs in New Jersey but do not include all possible values. Results are considered to be a representative, but not all-inclusive, subset of likely results. (more)

 

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Page Last Modified: Friday, 11-Jul-2014 08:12:27 EDT