The Township of Derry proposes a comprehensive upgrade to their current stormwater system, in areas with historical flooding and erosion problems. The proposed project includes the design of an integrated storm sewer, sanitary sewer, open channel, and roadway culvert elements in three (3) distinct problem “areas” within Derry Township.
Area 1 – (“Mill Street”) of the Stormwater Improvement Project is designed to reduce street flooding and property damage from intense storm events. The project begins near the intersection of Mill Street and Old West Chocolate Avenue, then follows Mill Street to Hockersville Road, traverses through the Rosedale Apartment complex to Cherry Drive, then follows Cherry Drive to Sandhill Road, finally following Sandhill Road to the intersection with Clark Avenue. The project also includes two spurs; first an isolated improvement near Greenlea Road at West Governor's Road (S.R. 322), and the second beginning at the Mill Street and Cedar Avenue intersection and running along the rear of the lots on Hillcrest Road, turning onto Chestnut Street and then ending.
Area 1 involves the replacement and realignment of approximately 3,000 feet of sanitary sewer line as well as approximately 9,200 feet of supplemental storm drainage system. This area contains sanitary sewer segments with little or no grade drop as well as restrictions due to poor hydraulic convergences at several manholes. This area also contains storm sewer that has less capacity than is desirable, which contributes to upstream flooding. The proposed project will also include new sanitary and storm sewer crossings under four lanes of S.R. 422 to increase capacity of the systems.
Project Cost and Funding: The expected construction cost of storm sewer and sanitary sewer improvements in Area 1 is $3 million that will be funded by a combination of a state H2O Grant and a Pennsylvania Infrastructure Bank Loan, secured by Derry Township and funds from the Derry Township Municipal Authority.