Page 11 - Nov-Dec 2019 Vol37 No5
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impervious area was added to the No-Detention. Based on the proximity adjacent Northshore Drive. The design
project site. The impervious surface area of the proposed site to the Tennessee provides measures to maintain water
contributes to extra surface stormwater River, the development’s stormwater quality and protect the integrity of Fourth
runoff. In order to meet the City of detention would be detrimental to the Creek, such as installing a three-sided
Knoxville’s stormwater ordinance, the flood elevations, subject to the time to concrete arch while utilizing the existing
additional stormwater and bridges had peak associated with the storm events. stream bed. Also, nutrient-separating baffle
to be considered, as to not raise the water Therefore, it was justified that stormwater boxes were installed to provide additional
surface elevation of Fourth Creek during detention was not required. water quality for the surface runoff prior to
peak storm events. entering Fourth Creek.
Fourth Creek’s stream banks were Working Together
CCI provided hydraulic, hydrologic eroding due to flooding and high velocities.
analysis that supported a Federal CCI provided a stream stabilization CCI worked in close communication
Emergency Management Agency plan that reduced the stream velocities, with the Sacred Heart Cathedral and its
(FEMA) No-Rise Certification and stabilized stream banks and did not impact school, the City of Knoxville, Tennessee
Department of Transportation, Tennessee
Department of Environment and
Conservation, and Knoxville Utilities
Board. Sacred Heart’s expectations were
for CCI to provide a design not just
per the architect’s direction, but also
incorporating the comments of the school,
cathedral, city, state and utilities board.
During construction, challenges were
encountered and revisions needed,
based on coordination with the state
right-of-way and utilities. CCI delivered
professional services from field surveying,
utility and civil engineering with the
successful completion of the Sacred Heart
Cathedral and School project for the
community for decades to come.
View online at tnpublicworks.com 11
