Owned by the town, the Mountain Run Lake (Mountain Run No. 11) and Lake Pelham (Mountain Run No. 50) dams do not meet state or NRCS dam safety criteria for high hazard dams and neither have adequate capacity to pass the PMF or can meet NRCS 10-day drawdown requirements.
Schnabel conducted a preliminary engineering and planning study to assess the condition of each dam, supporting NRCS in their development of a supplemental watershed plan and environmental evaluation for Mountain Run No. 11 and a supplemental watershed plan and environmental assessment for Mountain Run No. 50. Based on cost, reliability, and aesthetics, labyrinth spillways were recommended for both sites. Using experience in the design of more than 50 labyrinth spillways, Schnabel developed efficient layouts for these structures and also modified the principal spillway riser for Mountain Run No. 11 to meet seismic stability criteria.
The project is currently under construction and Schnabel is providing construction phase service.
- Project Design
- Planning of Conservation Measures
- Geotechnical Investigation
- Hydrology and Hydraulics
- CFD Modeling
- SITES Analysis