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PREVIOUS CSO CONTROL
WORK
The following projects and studies were completed prior to
developing Facilities Plan ’98 and the CSO Long Term Control Plan:
1980 Akron Facilities Plan
This was the Facilities Plan for the service area of the Akron WPCS. The work included
an Inflow & Infiltration Study and a Sewer System Evaluation Surveys. CSOs were
identified in the project. This report recommended a number of storage basins for CSO flow
control.
Retention Tank No. 2
A 3.9 million gallon retention facility was constructed near 9th Avenue and Settlement
Street in order to equalize flow to the Little Cuyahoga Interceptor and reduce overflows
to the Little Cuyahoga River. Racks 2N and 2S are tributary to this retention basin. Flows
up to a 6-month frequency design storm are retained by this facility.
Rain Gauges
The City has installed a network of rain gauges throughout the service area of the
WPCS. These rain gauges are telemeters to the Bureau of Engineer’s offices. The
information gathered has been and is being used for the CSO studies and other wet weather
related projects and activities.
Ohio Canal Combined Sewer Overflow Study
Phase I
This study analyzed the combined sewer system tributary to the Ohio Canal Interceptor
and provided a preliminary assessment of the water quality of the Ohio Canal. This report
provided a summary of possible system improvements to mitigate the water quality impacts
of combined sewer overflow; evaluated the ramifications of the construction of such
improvements on proposed development along the Ohio Canal; and developed a Phase II Plan
of Study for additional analysis.
Ohio Canal Combined Sewer Overflow Study
Phase II
This study continued the Phase I work and included an extensive amount of flow
monitoring, water quality sampling and sewer system modeling to get a better understanding
of the hydraulics of the racks. It provided short-term rack improvement recommendations
and recommendations for additional modeling to size conveyance facilities.
Cuyahoga and Little Cuyahoga Rivers CSO
Study
This study assessed the impact of the CSOs tributary to the Cuyahoga and Little
Cuyahoga Rivers and Camp Brook. The study began to identify the capacities of the existing
sewers and combined sewer interceptor system. It also analyzed the existing water quality
impacts of pollutants from CSOs. The purpose was to get a good understanding of the
hydraulics of the racks and overflows and an overview of CSOs on the rivers.
Akron CSO System Wide Study
This study documented the operation of the sewer system and how it reacts to rainfall
events; developed a site specific understanding of the biological and chemical impacts of
CSOs; and documented the physical nature of the receiving streams to determine their
use-attainability. Additional flow monitoring and sampling of the streams, overflows and
sewers were performed under dry and wet weather conditions. The sewer system model was
extended to include the separate sanitary interceptors and a receiving water model was
developed.
Combined Sewer Overflow Rack Improvements
The purpose of this project was to study, identify, and design improvements to the
combined sewer overflow manholes and racks to prevent dry weather overflows, improve the
City’s ability to identify necessary maintenance, and improve the control of coarse
solids and floatables by relatively simple means.
Combined Sewer Overflow Monitoring System
The purpose of this project was to replace the existing "Autocon" CSO
monitoring system with a new Motorola "Moscad" monitoring system. The Motorola
system communicates all system messages back to the sewer maintenance facility and allows
for early warning of potential CSO events.
Rehabilitation of Existing
Instream/Combined Sewer Overflow Sampling Stations
The purpose of this project was to rehabilitate the existing CSO instream sampling
stations that are located on the Little Cuyahoga River and the Ohio Canal. These automatic
stations bracket CSOs on the Ohio Canal and help quantify pollution loads from upstream
Little Cuyahoga locations. The stations were improved by replacing the sampling system and
the continuous monitoring probes. Further, a new communications system was installed to
assure reliable communications between the Akron Water Pollution Control Station and these
sampling stations.
Construction of Two New Instream Sampling
Stations
The purpose of this project was to construct new instream sampling stations on the
Little Cuyahoga River at Massillon Road and on the Cuyahoga River near the existing USGS
Old Portage gauging station in the Merriman Valley. The stations include new sampling and
monitoring equipment to assess river water quality parameters. Further, a communication
system will be installed to assure reliable communication between the Akron Water
Pollution Control Station and these new sampling stations.
Main Outfall Sewer Study
The purpose of this project was to complete a structural assessment of the primary
sewer entering the Akron Water Pollution Control Station. Items investigated included: the
internal and external conditions of the sewer, sources of inflow and infiltration, flow
restrictions, and the structural conditions of all appurtenances associated with this
sewer. The study made recommendations for a two phased rehabilitation program.
Little Cuyahoga Intercepting Sewer Study
The purpose of this project was to complete a structural assessment of this primary
sewer in the eastern part of Akron. Items investigated included: the internal and external
conditions of the sewer, sources of inflow and infiltration, and present flow
restrictions.
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