Raleigh, NC

Raleigh, NC

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City of Raleigh Public Utilities Department


The City of Raleigh Public Utilities Department (CORPUD) is making capacity improvements to gravity interceptors in the Crabtree Basin Service Area of the City's wastewater collection system, as identified on the Project Area Location Map. The improvements will provide a long-term solution to handling peak wet-weather flows and accommodate anticipated population growth within Raleigh's service area of the Crabtree Creek drainage basin.


Project Site
The Crabtree Creek drainage basin occupies an approximate area of 93,000 acres in Wake and Durham Counties, with about 85,000 acres in Wake County alone. Extending into areas of Raleigh, Durham, Cary, Apex, and Morrisville, the basin is bordered by I-540 to the north, I-40/440 to the south, Page Road in Durham County to the west and the Neuse River to the east. CORPUD serves roughly 68,000 acres within the overall basin. The proposed area for improvements encompasses the southeastern most part of the City's Crabtree Basin Service area and is located southeast of the I-440/US 70 intersection (Glenwood Avenue at Crabtree Valley Mall). The project area extends to Anderson Point Park, where Crabtree Creek flows into the Neuse River. The project will be bid and constructed in phases. Phase I will include approximately 21,000 feet of 60" and 72" gravity sewer interceptor from the US 64/264 bypass ramp at I-440 northwest to the east side of Capital Boulevard. Phase II will be constructed directly following the completion of Phase I and will include the construction of approximately 20,000 feet of 54" gravity sewer inceptor from Capital Boulevard to the north side of I-440 near Glenwood Avenue. Phase III will involve improvements and expansion at the Crabtree Lift Station, near the intersection of US 64/264 bypass ramp at I-440.


The Existing Situation
Like many communities, Raleigh has two different and separate sewer systems: a sanitary sewer system and a storm sewer system. The sanitary sewer system generally uses gravity to carry wastewater from homes and businesses to a wastewater treatment facility, where the water is treated and released into natural water bodies like lakes and streams. Storm sewers collect rainwater and transport the water to natural waterways, where it is released.

When the ground becomes saturated through heavy precipitation, excess water can seep into the sanitary sewer system through inflow and infiltration, or I&I. Sanitary sewer systems are designed to carry some I&I flows; however, excessive I&I can increase water flow in the sanitary sewer system, which in turn, can flood the system. Occasionally, the flooded sewer systems can overflow through manhole covers. This condition is known as sanitary sewer overflow, or SSO. The City has identified the locations of the SSO events in the Crabtree Basin Service Area. This information is provided on the following link: SSO Map


The Solution

The City is developing improvements to the wastewater collection system within the Crabtree Creek drainage basin that will reduce I&I to accommodate increases in wastewater flow while preventing SSO. This project was recommended in the City of Raleigh Sanitary Sewer Capacity Analysis as one of multiple projects within the basin service area and is included in the Capital Improvement Program (CIP). The estimated cost of this project is $70-$80 million. The total estimated cost for the entire list of projects in the City of Raleigh Public Utilities Department's CIP is approximately $1 billion.



City of Raleigh Public Utilities Department