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Water Service - Municipal Infrastructure

Woodlawn Creek Watershed Master Plan

Client:	Sanitation District No. 1 of Northern Kentucky
Location:	Woodlawn Creek Watershed
Budget:	$166,000
Achievement:	Storm water master plan with a model that was used for testing unforseen scenarios

XCG Consultants, Inc. (XCG) was retained for the Woodlawn Creek Master Plan by Sanitation District No. 1 of Northern Kentucky (SD1). This watershed is a 2,700 acre urban watershed of steep ridges and narrow valleys flowing through flat lowlands to the Ohio River. Much of the valley floor and Ohio River lowland areas have been developed with a mix of residential and commercial developments that suffer from frequent flooding.

Proposed future development in upstream areas threatened to increase flooding in downstream portions of the watershed if not properly managed.
SD1 anticipated assuming responsibility for stormwater issues for the entire watershed. In preparation, SD1 engaged XCG to develop a Watershed Master Plan to guide efforts to reduce current flooding issues and to guide stormwater management related to new development on an entire watershed basis.

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To investigate current and estimate future flooding, XCG developed a SWMM hydrologic and hydraulic model of the Woodlawn Creek watershed. The model results highlighted how changes in one branch of the watershed may impact areas downstream and, through backwater, on tributaries. To reduce flooding potential throughout the watershed, the final Watershed Master Plan recommends a mix of new relief infrastructure, along with increased maintenance and replacement of current infrastructure.

Since the development of the Master Plan, the watershed model was used to examine the impacts of two residential developments and also a stormwater conveyance repair and realignment. The model was also used to test stormwater conveyance options for the Chadwick Run storm water conveyance realignment through a residential neighborhood. This realignment involved threading a new storm water pipe with fixed endpoints along a residential street among a sanitary sewer, water main, and other utilities.

The most significant use of the model was examining the impacts and alternatives for the Newport Pavilion development. In cooperation with other consultants, XCG used an updated version of the model to review the impacts of the floodplain fill, the damage and proposed repair of a major culvert, and the impacts of proposed alternative solutions. Alternatives reviewed included replacing the filled floodplain with on-site and off-site storage combinations.