Township of Derry Drainage Improvements, Dauphin County

Other Dauphin County Projects: Stage Inundation Map Library for the Susquehanna River at Harrisburg

Category: Drainage Improvements and Floodplain Enhancements

Point of Contact: James Negley, Township Manager, Township of Derry, (717) 533-2057

Project Description: Project entailed drainage design, sanitary design, stream restoration, obtaining (2) Water Obstruction & Encroachment permits, (3) NPDES permits, and (5) HOP permits. Hebert, Rowland & Grubic, Inc. (HRG), the Township Engineer, provided surveying, preliminary and final design, hydrology and hydraulic analysis, natural stream design, technical specifications, preparation of easement plats and negotiations with property owners, utility coordination, Norfolk Southern coordination, preparation of a Project Manual and bidding documents, contract award services, contract administration services, and construction observation services. Construction of the project lasted over two (2) years.

Issues Encountered: Issues encountered included deep pipe installation depths (20+ feet) and numerous sinkholes due to the karst geology underlining the Township. Over 50 temporary construction and permanent drainage easements were obtained to work on private property. Addressing all of the individual property owner’s expectations of final restoration was challenging.

Funding Stream(s): HRG developed a funding strategy, prepared the applications, and secured the necessary funds to make this project a reality. This project was funded through a $4.3 million dollar H20 Grant and a $1.8 million dollar Pennsylvania Infrastructure Bank (PIB) loan. The original construction contract awarded for $5,358,810.

Floodplain Management and
Mitigation Success Stories

Drainage Improvements and Floodplain Enhancements
Dauphin County -Township of Derry Drainage Improvements

Emergency Management/Planning
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Emergency Management/Warning Notification
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Flood Risk Management
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Hazard Mitigation
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Local Preparedness
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Local Preparedness/Mitigation
Butler County - Harmony Junction Dam Removal, Connoquenessing Creek, Jackson Township
Mercer County - Cunningham Memorial Dam Removal, Grove City
Dauphin County - Stage Inundation Map Library for the Susquehanna River at Harrisburg
Union County - Acquisition and Demolition of Ten Flood Prone Properties located on South Sixth Street in the Borough of Lewisburg

Local Preparedness/Warning Notification
Cameron County - Outdoor Siren Warning System at the George B Stevenson Dam

Spatial Data Survey of 67 counties

Risk Communication/Outreach
Pennsylvania Silver Jackets’ Flood Risk Management Resources Website