The Stevenson Creek
basin encompasses approximately 6,000 acres in central Pinellas
County, approximately 4765 acres of which lie within the limits
of the City of Clearwater. The remainder of the basin, which consists
of the upper reaches of the Spring Branch Subbasin, falls primarily
within the limits of the City of Dunedin. See
development of the Stevenson Creek Watershed Management
Plan is directed towards the achievement of the following
the storm water management facilities, both natural and man-made, within the watershed
to enable detailed engineering evaluations.
Identify flooding areas and characterize
the nature, extent and frequency of flooding,
adopt level of service standards for
flooding, and provide solutions for flood
protection commensurate with the potential for
Identify water quality
problems in the watershed remedial
solutions., ascertain the source and
nature of the problems, adopt water
quality goals, and seek
locations of channel erosion, assess the
nature and cause of the individual
problems, and develop remedial solutions.
Identify and assess the
viability of ecological systems in the
watershed and identify potential areas
for habitat restoration and protection.
Recommend specific capital
improvement projects or programs with an
emphasis on integrating flood protection,
water quality, and ecological protection/restoration
Develop the Watershed
Management Plan with active public
participation and input.
|East bank of Stevenson
Creek near Pinebrook and Hibiscus, looking
The Stevenson Creek Watershed
Management Plan will be developed and organized into the
seven basic elements described below.
The background element
includes a complete description of the watershed
and the major conveyance systems, as well as the
sources of data used for project development.
The flood protection
element includes the development of hydrology and
hydraulic models to simulate the response of the
watershed to a variety of rainfall conditions.
The methodology behind the development,
calibration and verification of the models will
be presented. The modeling results will be used
to identify the current level of service for
flood protection within the watershed. Problem
areas will be defined as those not meeting the
levels of service criteria.
branch at Highland Avenue, looking west.
Water Quality and Natural
This element includes an
assessment of the existing water quality in the
lakes, streams and groundwater within the
watershed. Natural systems are evaluated as
either upland or wetland systems and issues or
areas of concern will be identified. An
assessment of water supply issues will also be
incorporated into this element of the plan.
A pollutant loading
model will be developed and utilized to predict
the gross and net pollutant loads which are
expected from each identified subbasin area.
Gross pollution is the amount of contaminant
generated in a subbasin. Net load is the amount
of pollutant discharged into the receiving water
bodies after treatment. The pollutant loadings
model will be used to develop and assess the
water quality level of service for current
conditions in the watershed
Avenue crossing of spring branch, downstream side.
Alternatives which address
both flooding and water quality problems will be
developed and presented, including conceptual
site layouts and designs. These alternatives will
be presented in a public meeting to assist the
County in the selection and identification of
the Level of Service
Levels of service for
flooding and water quality will be compared to
those already defined.
for achieving cost effective flood protection and water
quality objectives will be developed and presented to the
public for stakeholder comment and input. Based on the
results of the public meetings, a final list of
recommended projects will be developed.
Parsons Engineering Science,
-- This page updated: 08/04/05