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1.1.3 Drainage Facilities

Citywide Floodplain Study - Staff proposes to study the City’s approximately 24-linear miles of
stream channels and abutting floodplain to determine the extent of probable flooding from
storms classified as 10-year, 25-year, 50-year, 100-year and 500-year rain events, at both
current and future built-out conditions. The study results will enable staff to better assess flood
risk of properties in and around the floodplain and to determine where emergency services
may need to be deployed during various rain events

Westerly Ditch Drainage Project - The drainage ditch between Chapin Road and Circle S Road
needs to be reshaped and armored to allow stormwater to more freely flow down the ditch. The
ditch, both upstream and downstream of this location, has been improved allowing for greater
flow capacities. However, the stormwater bottlenecks at this ditch section and must be reshaped
and armored with geogrid matting and vegetation to function properly.

Storm Drain Condition Assessment - The City is proposing to evaluate the condition of all the
existing storm drain system in the City. This evaluation will include sending a remote camera
through the entire system to digitally record the condition of the system. The scope of work
will also include surveying each inlet, outlet and storm drain manhole location to develop an
up-to-date map of the system. The City will be broken up into quadrants and one quadrant will
be assessed each year. It is anticipated that it will take approximately four (4) years to complete
the assessment. The project provides the City credit on the Stormwater Management Program
and Community Rating System.

Southside/Dawn Plantation West Drainage Project - This drainage project is a continuation of
the previous Plantation West Drainage Improvement project. The previous project made
improvements upstream of the Dawn Street bridge and this project proposes improvements on
the downstream side of the bridge.

Dutch Branch Park Low Water Crossing Project - The low water crossing on Lake Shore Drive is
a hazard to vehicles and bicycles when water overtops the road during heavy rains. City crews
have to shut gates to keep drivers from traveling across the flooding road during heavy rains.
Improvements may include a bridge structure or reinforced box culvert design. The crossing
would also include railings to keep drivers from leaving the road.

Dutch Branch Park Drainage Improvements Project - During heavy rains, stormwater flows
across ball fields and the running track damaging infrastructure and ponding in low areas. The
project would regrade the park as needed to allow water to flow through the park without
damaging infrastructure. The project will evaluate the drainage patterns in the park and
recommend grading improvements that minimize disturbances to the existing infrastructure
while allowing water to safely flow through the park.

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