Midvale staff and consultants presented the city's stormwater master plan Oct. 7, identifying 12 capital projects totaling an estimated $20.7 million and recommending an annual pipe-replacement program and improved inspection capacity.

Kayson Shirts of the consultant team said the project required substantial GIS and field data collection; Midvale staff completed missing survey data to support hydraulic modeling. The analysis mapped drainage basins and pipe capacity, applied soil and impervious-area data, and used a 10-year design storm to identify locations where pipes surcharge under design flows.

The plan's key recommendations include: three major projects that remove irrigation-pipe dependencies and relocate storm lines into public right-of-way (estimated $14.7 million), connectivity and trenching projects ($670,000), other neighborhood connections, and targeted repairs. The plan also identifies aging corrugated metal pipe and recommends annual set-asides of $200,000 for replacement and acquisition of a CCTV inspection truck to prioritize work. Staff recommended adding the plan to the consent agenda for formal acceptance and CIP consideration.

Council discussion included storm preparation and maintenance; consultants and staff said proactive cleaning and inspection ahead of major storms reduces flooding risk. Staff recommended periodic updates to the master plan about every five years.