Get Full Government Meeting Transcripts, Videos, & Alerts Forever!
Get email alerts on the Harbor Dredging topic
No spam. Unsubscribe anytime.
Commission finalizes Manchester Harbor dredging order, adopts consultant‑recommended 3:1 side slope
Summary
After technical discussion, the commission accepted consultants' recommendation to retain a 3:1 dredge side‑slope for the harbor entrance and voted to issue a final order with that specification and prior conditions in place.
The commission reviewed a pending order of conditions for the Manchester Harbor entrance dredging project, focusing on the allowable side slope of the dredge face. Technical discussion centered on whether to require a 2:1 slope (recommended by an outside advisor) or the consultant's designed 3:1 slope based on seabed material and dredging method.
Town staff and the consultant explained that the dredge geometry is controlled by the in‑situ seabed composition: loose sand tends to produce shallower 3:1 faces while stiffer materials can be steeper. Consultants said redesigning to meet a prescribed 2:1 slope would require additional geotechnical work and could exceed the grant funding available for design changes.
After weighing feasibility, cost and mitigation considerations, the commission accepted the consultant recommendation to retain the 3:1 slope as currently designed and voted to issue a final order incorporating that specification with the other previously approved conditions intact.
