Operational Plan for the Restoration of Diadromous Fishes to the ...

- methods and location for diversion of water
- erosion and sedimentation control
- excavation, removal and disposal, at an approved off-site location, of excavated materials
- extension of storm drainage facilities
- removal of submerged upstream cofferdam materials left from previous projects
- removal of piers and other submerged remains of previous developments
- mitigative measures that may are found necessary upon inspection of the lowered
reservoir area
- water control structure
- final design planning
- construction management
- permitting
- contingencies
Operation & maintenance: anticipated schedule and costs of routine operations and
maintenance of the bypass channel, control structure and other design features
Preliminary engineering design drawings:
The preliminary design drawings will include the existing conditions plans (preferably 50scale
plans or smaller scale), plan view sheets (with centerline and station numbers) of
channel and cross vane structures, channel profile (tied into station numbers), cross
sections of the channel (at the cross vane locations and some areas between cross vanes)
and overtop floodplain, and details of the water control structure, stone sizes and
composition, and sequence of construction notes. The channel design should take into
account not only low flow conditions, but how weaker-swimming fishes (e.g., juvenile eels)
may be accommodated in the design (e.g., near shore rock or log structures) during at least
normal flows. Any needs for floodplain and channel bank (re)vegetation should be included
as part of a planting plan in the preliminary plan set. Lastly, the consultant should be
encouraged to include any public safety measures in the plans, as needed.
The consultant will be expected to provide all information to develop and complete the
preliminary design plans. The plans will likely consist of six or more sheets (plans should be
annotated with symbol legend and key design parameters – including operating flows, water
surface elevations, and velocities):
1. Existing conditions plan depicting topography and bathymetry of the project site area, as
well as head pond and tailwater surface elevations, flagged wetland boundaries, existing
infrastructure, soil boring locations, and other natural or man-made features potentially
affecting or affected by project design.
2. Scaled plan view of the preferred design alternative, depicting dimensions, expected
channel geometry/sinuosity, channel grade slope and bank slopes, rock material, instream
grade control structures, water control structure, and other important features.
3. Profile and cross-section views of bypass channel and structures, including low flow
channel, overbank floodplain grades, and expected water levels in bypass during low,
normal and high operating flows and flood flows. The cross sections of cross weir structures
will also be provided.
Details of temporary water diversion and/or water control, channel and rock materials (sizes
and composition), water control structure, entranceway (in relation to existing dam and
PRFP Page 288