Township Line Storage Dam, Chester County, Pennsylvania

Home 5 Selected Projects 5 Dams 5 Township Line Storage Dam

Overview: This Chester County structure was constructed in the early 1940s as a 35-ft high, clay reservoir dam for the West Chester Municipal Authority. It has been assigned to the high hazard category by the National Dam Inventory. In response to updated probable maximum flood predictions (PMF) for Chester Creek, the municipal authority decided to (1) raise the dam’s crest 5 ft for increased safety against overtopping, (2) armor the downstream face with gabions, and (3) reconstruct and enlarge the spillway. GeoStructures provided the geotechnical investigation for the project. 

Subsurface information from nine test borings (performed along the crest and side slopes of the berm) was supplemented by index testing, direct shear tests, and unconfined compression tests on the compacted clay soils in the laboratory.

The dam’s condition was found to be excellent, and no seepage was detected. Stability of the heightened dam was considered under the following stages: end of construction, full reservoir, rapid drawdown, and long-term. GeoStructures’ engineers also designed the benching and blanket drain details and provided criteria for extending the spillway walls.

Connect with us.

Providing state-of-the-art geotechnical engineering services with an unwavering commitment to excellence and innovation.

Percolation and Permeability In-Situ Testing 

Drilling Services and Subsurface Investigations

Foundation Investigation and Design

Highway and Bridge Geotechniques

Support of Excavation and Underpinning

Soil-Structure Interaction Analysis and Modeling

Soil Dynamics & Site-Specific Response Spectra

Vibration Monitoring and Analyses

Forensic Evaluations

Slope and Retaining Wall Evaluation and Design

Lime and Cement Stabilization

Mine Subsidence Analysis and Remediation

Sinkhole Evaluation and Remediation

Soil Improvement Techniques

Dam Analysis and Rehabilitation

Environmental Services

Landfills, Ponds, and Lagoons

Pavement Design and Rehabilitation

Construction Inspection and Materials Testing

Geotechnical Laboratory Testing

Concrete and Cement Testing

Petrographic Analysis

Instrumentation and Special Testing

Asphalt Testing

View All Services >

3-D Dynamic Finite Element Analysis



Institutional & Educational


Industrial, Pharmaceutical, & Gene Therapy

Landfill Expansion Design


Research & Forensics


Water & Wastewater

View All Selected Projects >

Who We Are 

Who We Are

Meet Our Team

Contact Us 

Pay Invoice

Contact Us