Get Full Government Meeting Transcripts, Videos, & Alerts Forever!
Stormwater models show outfall consolidation raises local ponding; green infrastructure may help
Summary
Hazen’s stormwater modeling showed consolidating two outfalls into a single Francis Street outfall increases short-term street ponding during high-tide rainfall; consultants recommended evaluating rain gardens, tide gates, and possible small pumps as mitigation.
Hazen engineers presented stormwater modeling that evaluated rainfall-driven flooding during high-tide conditions and tested whether consolidating two outfalls would increase or reduce street ponding on Washington Street.
The firm modeled design storms (SCS Type III distribution) of about 1 inch (roughly a 6‑month event), 3 inches (about once per year), and 5 inches (about once in 10 years) while aligning peak rainfall with a high-tide tailwater time series provided by the coastal team. Ben of Hazen said the modeling found that eliminating the Meador Street outfall and routing flow only to the Francis Street outfall can increase localized flooding on Washington Street because the Francis Street outfall and pipe configuration lack the head…
Already have an account? Log in
Subscribe to keep reading
Unlock the rest of this article — and every article on Citizen Portal.
- Unlimited articles
- AI-powered breakdowns of topics, speakers, decisions, and budgets
- Instant alerts when your location has a new meeting
- Follow topics and more locations
- 1,000 AI Insights / month, plus AI Chat
