USGS - science for a changing world

New Jersey Water Science Center

  home   water data   projects   publications   hazards   news   about us   contact   webcams



USGS Water Science Centers are located in each state.

There is a USGS Water Science Center office in each State. Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Provided in cooperation with New Jersey Department of Environmental Protection

NJ DEP Logo.

Program to Maintain and Update Groundwater Models

Hydrogeology and simulation of groundwater flow, Picatinny Arsenal and vicinity, Morris County, New Jersey

By Lois M. Voronin and Donald E. Rice

Map of the model's study area

STATUS: Archived


AREA STUDIED: Rockaway Township, Morris County

AQUIFERS SIMULATED: Glacial sediments and carbonate bedrock


MODEL SIZE: 6 layers, 36 rows, 95 columns

MINIMUM GRID SPACING:70 feet X 80 feet

REPORT: USGS Water-Resources Investigations Report 96-4061


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

Report Abstract

Groundwater flow in glacial sediments and bedrock at Picatinny Arsenal, N.J., was simulated by use of a three-dimensional finite-difference groundwater-flow model. The modeled area includes a 4.3-square-mile area that extends from Picatinny Lake to the Rockaway River. Most of the study area is bounded by the natural hydrologic boundaries of the groundwater system.

Geophysical logs, lithologic logs, particle-size data, and core data from selected wells and surface geophysical data were analyzed to define the hydrogeologic framework. Hydrogeologic sections and thickness maps define six permeable and three low-permeability layers that are represented in the model as aquifers and confining units, respectively.

Hydrologic data incorporated in the model include a rate of recharge from precipitation of 22 inches per year, estimated from long-term precipitation records and estimates of evapotranspiration. Additional recharge from infiltration along valleys was estimated from measured discharge of springs along the adjacent valley walls and from estimates of runoff from upland drainage that flows to the valley floor. Horizontal and vertical hydraulic conductivities of permeable and low-permeability layers were estimated from examination of aquifer-test data, gamma-ray logs, borehole cuttings, and previously published data. Horizontal hydraulic conductivities in glacial sediments range from 10 to 380 feet per day. Vertical hydraulic conductivities of the low-permeability layers range from 0.01 to 0.7 feet per day.

The model was calibrated by simulating steady-state conditions during 1989-93 and by closely matching simulated and measured groundwater levels, vertical groundwater-head differences, and streamflow gain and loss. Simulated steady-state potentiometric-surface maps produced for the six permeable layers indicate that groundwater in the unconfined material within Picatinny Arsenal flows predominantly toward the center of the valley, where it discharges to Green Pond Brook. Beneath the upper confining unit, groundwater flows southwestward, down the valley. Between First Street and Farley Avenue, the upper confining unit pinches out near the valley walls, resulting in a major input of water to, and causing a local potentiometric high in, the underlying aquifer layers. Groundwater-flow directions southwest of the southern arsenal boundary are predominantly to the Rockaway River.

USGS/NJDEP Model Archive Information Request (Model/MODFLOW requirements)
Your name: E-Mail:

Method of delivery:

Mailing Address/Comments:

Would you like to be notified of updates to the model files requested.?

In an effort to better serve the public, USGS and NJDEP, our cooperator on this model maintenance program, are interested in learning how our models are used. (Please check all that apply.)

Accessibility FOIA Privacy Policies and Notices logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: New Jersey WSC Webmaster
Page Last Modified: Tuesday, 04-Sep-2018 08:18:11 EDT