There are over 80,000 dams listed in the National Inventory of Dams and at least 2,000 dams in Pennsylvania. Many of these dams are at least 100 years old, reaching/exceeding their design life, and/or require significant improvement/modification. In addition, recent evaluations of precipitation data and changes in hydrologic methodologies have concluded that many of these dams have spillways that are undersized. With the ever increasing concerns for costs and the desire to maintain aesthetics, dam owners are searching for creative solutions for their dam rehabilitation/improvement needs.
Advanced GeoServices’ experienced dam safety engineers have developed a unique and common sense approach to help dam owners manage the risk, cost, and aesthetics for their dams. This technical approach can include, as appropriate, the following activities:
• Detailed hydrologic evaluation of the dam’s watershed to determine a realistic spillway design flood. This is best accomplished by performing a focused reconnaissance to identify conditions that influence stormwater runoff within the dam’s watershed.
• Review/evaluation of the dam’s hazard potential (including dam breach analyses and associated inundation studies to determine the impact/extent of a dam breach).
• Evaluation of dam/spillway rehabilitation/improvement options.
• Detailed hydraulic evaluation of the capacity/condition of the downstream channel to determine the impacts of the spillway design flood.
If the results of these evaluations indicate that rehabilitation/improvement to the dam is required, Advanced GeoServices can develop the design package and prepare the permit application for agency review.
Dam Engineering Services:
• Detailed Hydrologic Evaluations
• Spillway Capacity Calculations
• Review of Hazard Potential
• Dam Breach Analyses and Inundation Mapping
• Downstream Hydraulic Evaluations
• Sediment Management
• Dam Rehabilitation / Improvement Concept Planning
and Final Design
• Stream Channel Stabilization
• Wetlands Delineation / Restoration
• Preparation of Permit Applications
• Construction Bid Assistance
• Construction Oversight
• Emergency Action Plan (EAP) Preparation and Review
• Dam Inspections
For more information, contact:
Todd D. Trotman, P.E.
Leopard Lake Dam in Berwyn, PA
The group that is responsible for the dam wanted to investigate whether the reclassification of the dam was unwarranted. Advanced GeoServices conducted a file review, a site survey, a review of the HEC-1 analysis, a floodplain evaluation, and a dam inspection.
Lake Akiba Dam in Jackson Township, Monroe County, PA
Advanced GeoServices conducted a site visit, formatted the existing HEC-1 model, reviewed the evaluation report, reviewed the hazard classification, conducted a file review, evaluated the existing hydrologic/hydraulic model, provided a topographical survey, conducted a detailed hydrologic study, performed a HEC-RAS analysis, determined the ACB protection sizing, and evaluated outlet structure issues.
Ash Basin No. 4 in Northampton County, PA
Advanced GeoServices designed, managed, and provided construction oversight for the integrated dewatering, erosion and sediment controls, and ash basin drying/consolidation, and the basin grading.
Pinecrest Lake Dam in Pocono Pines, Monroe County, PA