Environmental Engineering Reference
In-Depth Information
Cahill Associates was retained to perform a series of studies and model analy-
ses, including flood modeling and chemical transport into the impoundments. The
long-term goal was to influence land development plans within the watershed to
mitigate the effects of stormwater on the human-made lakes and stream quality.
Intensive meetings and conferences were held with the 15 municipalities in the
basin, all of which had a different perspective on the various water resource
issues.
The GVA Water Balance Model: Sustainable Watershed Management
in Northern Chester County, PA (1995-2001)
The Green Valleys Association (GVA), situated in northern Chester County,
Pennsylvania, has served as a technical resource for the 20 townships that are
situated in five small watersheds in southeastern Pennsylvania, tributaries to
the larger Schuylkill River, primary source of water supply for the city of
Philadelphia and smaller communities downstream. The undeveloped land in
most of these watersheds, known locally as the “green valleys” area, has resulted
in very high water quality for over two centuries, but the expansion of sub-
urban development in the late 1990s created a very strong awareness of the
potential impact on both water quality and the quality of life (Figure B-10).
GVA initiated an effort to plan for sustainable land and water resources, includ-
ing water supply (primarily groundwater), wastewater (primarily land applica-
tion without stream discharge of effluent or on-site), and stormwater, following
the concept of no new increase in volume. Cahill Associates, in association
Figure B-10
Excessive groundwater withdrawals affect the stream base flow.
Search WWH ::
Custom Search