ho Design Services & Project Management of Downtown Riverfront Implementation
October 31, 2014
L414 - Concapt Design for Trail.
This sud area includes the concepiual design of a future trail that will connect wesierly
toward the broad Street Parkway and possibly beyond. The design will also account for a
potential future multi-use bridge conneciion across the river, Including planning for likely
structure support locations. This area will require close coordination with the land owner to
Getermine how the trail would integrate into their development plans.
Product: Provide up io two (2) design alternatives including plans, typical crass sections, and
sketches as appropriate to define the proposed improvemenis,
Lead Consultant: VHB
Support from: Halvorson, HSI
1.5 River Hydrology
Any of the design that would result in fill within the floodplain and Tloodway must be
coordinated with HL Turner since they will maintain the river hydraulics model.
HL Turner will develop 2-, 5-, 10-, S0-, 100- and 500- yaar peak Nashua River flows using
data/analysis of stream flow records from the USGS" Pepperell, MA gage, transposed downriver
to the project site.
HL Turner will create a project design river hydraulic mode! using the current effective FEMA
HEC-RAS model, and determine flow-water surface elevation protiles for the 2~through 500-year
peak river flows, and the FEMA regulatory floodway zone.
Based on ihe agreed upon project design flocd resiliency and structural criteria, HL Turner will
select and insert the design Concept Plan features into the project design hydraulic river model.
HL Turner will provide VHB and the Project Team the results of the hycrautic impacts (ie, water
surface elevation rises, floodway impacts and river velocity increases) identifying impacts and
recommendations on how to deal with the impacts (le. removal or reorientation of certain plan
features).
Lead Consultant: HL Turner
Support jram: VHB, Halyosan
Estimated Duration: 10 weeks
1.6 Lighting
itis understood that the majority of the conceptual Riverfront lighting design has already been
advanced under an existing City contract by Lumen Design Studios with support from
Fitzemeyer & Tocci for power supply. There may still be a need to involve these team members
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