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Selectmen approve $50,000 contract to update stormwater GIS mapping, prioritize 5-Mile River watershed
Summary
The board approved a not-to-exceed $50,000 contract with Ty and Bond to digitize catch basins, manholes and pipe flow directions, and to perform field mapping (up to 25 six-hour days) prioritized to the 5-Mile River watershed to support MS4 reporting and future planning.
The Board of Selectmen on April 7 authorized a contract with Ty and Bond to update and enrich New Canaan’s stormwater GIS database, with an emphasis on the 5-Mile River watershed where the town has the most missing data.
Maria (S6) presented the proposal: Ty and Bond will digitize catch basins and manholes from aerial imagery, add flow-direction arrows for drainage lines, integrate recent state DOT drainage updates, and conduct field days (up to 25 six-hour days) to collect rim elevations, pipe material and invert elevations in selected subwatersheds. The consultant will deliver updated mapping for the town’s private and public GIS views so highway and DPW crews can record cleaning and maintenance and make better, evidence-based decisions prior to paving or repairs.
Board members expressed concerns about cost-per-hour and how much net mapping the town would receive; Maria and S6 said much of the work is preparatory in-house database reconciliation and deliverables include both field and back-office integration. The work will reduce future dependence on external consultants once the database has key elevations and material records.
The board approved the not-to-exceed $50,000 contract and directed staff to prioritize the 5-Mile River watershed and to return with public-facing visuals explaining the mapped subwatersheds and what the outputs will mean for future planning.
Quote
"Once we complete our field work we would only have to do this when the state does additional updates," Maria (S6) said, describing how the town could use the deliverables for day-to-day highway planning.
Why it matters
Improving the town’s GIS stormwater data will help engineers size pipes, predict downstream impacts and prioritize capital repair work. It also supports the town’s MS4 annual reporting obligations.
Ending
Ty and Bond will begin preparatory database work and then mobilize for prioritized field days; staff will share a map of subwatersheds and a status update with the board when field work is underway.
