Digital Geodata Series
DGS02-2 Well Head Protection Areas For Public
Community Water Supply Wells In New Jersey.
A Well Head Protection Area (WHPA) in New Jersey is a map area calculated
around a Public Community Water Supply (PCWS) well in New Jersey that delineates
the horizontal extent of ground water captured by a well pumping at a specific
rate over a two-, five-, and twelve-year period of time for confined wells.
The area of capture over two-, five-, and twelve-years is defined using line
boundaries and polygon areas generated with the ARC/INFO Geographic Information
System (GIS). The confined wells have a fifty foot radius delineated around
each well serving as the well head protection area to be controlled by the
water purveyor in accordance with Safe Drinking Water Regulations (see NJAC
7:10-11.7(b)1). GIS coverages are produced for each PCWS well and for the
set of all PCWS wells in each county and the state using the ARC/INFO UNION
command on individual coverages. The individual and county coverages are
prepared for distribution as uncompressed ARC/INFO export files. The
statewide NJWHPA file is prepared for distribution as an ESRI shapefile
with metadata and ArcView Legend file, njwhpa.avl. The export files
are combined with parameter-reference files for each county in compressed
'zip' files for delivery over the Internet. WHPA coverages therefore include
line and polygon GIS coverage with associated database files and
parameter-reference files for data documentation. The documentation files
are ASCII text files having the 'txt' file-name extension.
WHPA delineations are conducted in response to the Safe Drinking Water Act
Amendments of 1986 and 1996 as part of the Source Water Area Protection Program
(SWAP). The delineations are the first step in defining the sources of water
to a public supply well. Within these areas, potential contamination will
be assessed and appropriate monitoring will be undertaken as subsequent phases
of the NJDEP SWAP. WHPA delineation methods are described in
for Delineation of Well Head Protection Areas in New Jersey". .