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City receives stormwater master plan with $20.7 million recommended CIP and pipe-replacement program
Summary
Public works staff and consultants presented a completed stormwater master plan that identifies 12 capital projects (total estimated $20.7 million), recommends separation from irrigation infrastructure and a $200,000 annual pipe-replacement reserve plus a camera inspection program.
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.
