Rainwood Lane Stormwater Improvements (North Ridge Phase V)
This project is being led by: Stormwater Utility
Brown and Caldwell, Inc. - Engineering Consultant
Formal design of improvements to the existing undersized storm drainage system is underway. Preliminary construction plans have been developed and will be revised as the design process continues. The team is also actively working with property owners who will be affected by the proposed construction improvements. The design plans are currently at the 65% stage.
History and Background
This project is one of several similar projects located along the northern tributary stream to the upper North Ridge Country Club Lake. It is located in the Perry Creek Watershed. A history of flooding events resulted in public meetings in April and June 2006. An engineering study was completed in December 2006. Street and structural flooding has occurred along this street and the engineering study recommended improvements to the existing storm drainage system.
Design includes the installation of a 48 and 54 inch reinforced concrete piping system in the vicinity of 1201 Rainwood Lane and a box culvert system 4 feet high and 4 feet wide near 1208 Rainwood Lane. The outlet of the box culvert system will be at the rear of the property at 1208 Rainwood Lane. This installation will be in addition to the existing storm drainage pipe in the street resulting in a parallel system with more capacity. The following is an overall project location map indicating the location of the Rainwood Lane project in relation to others. In addition to the stormwater system upgrades, sanitary sewer main replacements will occur to bring the sewer pipe up to City of Raleigh standards and to move portions of the main out of conflict with the stormwater system upgrades.
Goals and Objectives
The goal of the project is to reduce the frequency of street and right of way flooding by providing a 10-year level of service for Rainwood Lane. This means that the street will not over-top in the storm event of a magnitude expected to be equaled or exceeded once on average in a 10-year period. in addition, the project will reduce significant private property yard and structural flooding.
Final design and easement acquisition is anticipated in early 2014 with construction anticipated to begin in late 2014 (contingent upon easement approvals). It should be noted that the timing of the project is dependent upon completion of downstream system upgrades at Knight's Way, Haymarket Lane and Harps Mill Road. These downstream system upgrades must be completed first such that the system capacity is adequate for the improved flow conditions upstream at Rainwood Lane.
A public meeting was held on August 25th, 2011 at the North Regional Public Library on 7009 Harps Mill Road to discuss this along with other upcoming North Ridge Projects.