A Natural Resource Management Guide for the County of Morris A ...

Figure 2 - Major Physiographic Features and Boundary
of the Central Passaic River Basin
Source: N.J.G.S., Geological Survey Report GSR 34, 1994.
The wetlands within the Central Passaic River Basin exhibit varying hydrologic behaviors. Troy Meadows
in East Hanover serves as a ground water discharge on its western edge and ground water recharge to the
east. Both the Great Swamp and Great Piece Meadows lie atop lake-bed sediments confining the underlying
aquifers. The Bog and Vly, Lee, Troy, and Black Meadows experience ground water interchange depending
on water levels of the aquifer.
In the swamp areas that are underlain by clay and silt, discharge of ground water to the streams is restricted
by low permeability of the materials and the slight hydraulic gradients. During the vegetative growing season,
most of the ground-water discharge occurs as evapotranspiration. Thus, dry-weather stream flow is not
augmented significantly, but may even be reduced.
A Natural Resource Management Guide
for the County of Morris 59