Performed
Hydrologic Studies and Hydraulic Engineering Investigations and Designs for the
Nakoma Brook Watershed located in Western Rockland and Southeastern Orange
Counties, encompassing over 8 square miles. The study area focus was in the
Village of Sloatsburg, NY at the intersection of Route 17 and Eagle Valley Road.
Flood Control analyses were conducted using USACOE's HEC-1 and HEC-2 computer
simulation models. Work included detailed field reconnaissance and surveys of
the entire watershed and surrounding areas along Nakoma Brook and Ramapo River.
Engineering assessments of stormdrainage systems, culverts, dams, spillways,
bridges, open channels and stream embankments. Preparation of engineering
designs for improvements of floodway. Modeling and mapping of computer generated
Flood Plain Plans and Profiles. Analysis of various alternatives to ameliorate
flooding, erosion, and siltation on the Nakoma Brook and its tributary, which
includes over 3.5 miles of stream with discharge to the Ramapo River.
Project included structural and hydraulic analyses and assessment of
Cranberry Lake Dam and spillway (tributary to Nakoma Brook) as well as
alternative design repairs and methods to increase dam and spillway elevation
for increased storage.
Recommended flood amelioration designs included: Construction of new levees,
dikes, culverts, bridge culverts, lined channels, new concrete lined water way,
weir repairs, dam repairs, channel dredging and stream maintenance.
Deliverables included production of an Engineering Design Report; Existing
and Proposed Flood Plain Drawings (Maps), Profiles, Cross-sections; Cost-benefit
Economic Analyses of Flood Amelioration Alternatives; Stream Maintenance
Drawings; Stream Maintenance Report.
