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Council approves reduced-scope field survey for stormwater master plan
Summary
West Burlington authorized a $115,000 amendment to the stormwater professional-services agreement to collect in-field measurements on roughly 207 structures lacking GIS data; consultants will deliver the resulting data as a GIS layer for future planning.
The West Burlington City Council voted to approve an amendment to a professional-services agreement so consultants can complete field measurements needed for the city's stormwater master plan. Council members were told consultants originally identified about 750 structures citywide but narrowed the list to roughly 207 locations for which the city lacks adequate GIS or as-built data. The proposed in-person data collection will record details such as rim elevations and pipe invert sizes that are not present in the city's current records.
Greg said the original quote for comprehensive fieldwork was about $255,000 but that cost was reduced to $115,000 after council agreed to provide two city staff members to assist the consultant teams. "We were able to bring that cost down to the $115,000 they're proposing to go out and do two 207 structures and get the measurements that they need for the study," Greg said. The work will produce a GIS layer that the city can use for future analysis and projects.
Council members asked for clarification about why the data were missing and whether consultants should have identified that need before quoting. Staff explained much of the required information is underground (manholes, pipe sizes, inverts) and that older projects’ paper as-builts were not fully digitized. Greg said the consultants and staff reviewed available documents and determined additional fieldwork is necessary to ensure accurate hydraulics for flood and runoff modeling.
The motion to approve the amendment passed by voice vote. The city will receive the collected data as a GIS layer and can later expand the field survey if additional structures need documentation.
