Overcoming Cost Barriers for Green Infrastructure in Des Moines
GrantID: 76275
Grant Funding Amount Low: $2,500
Deadline: Ongoing
Grant Amount High: $25,000
Summary
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Grant Overview
Iowa cost constraints for green infrastructure projects require applicants to use Iowa Department of Natural Resources-approved permeable pavement specifications that account for the state's freeze-thaw index of 82. Proposals must demonstrate construction costs at or below $18 per square foot for rain gardens using Iowa-native plant stock sourced within 200 miles. The Iowa Department of Transportation mandates hydraulic calculations using the Rational Method adjusted for Des Moines' 36-inch average annual precipitation.
Application requirements include filing with the Iowa Storm Water Management Manual review process and obtaining sign-off from the Polk County Soil and Water Conservation District. Applicants must provide maintenance cost projections not exceeding $0.42 per square foot annually, verified through three-year performance bonds. Iowa's prevailing wage law applies to all projects exceeding $100,000, requiring certified payroll submissions.
Fit assessment for Iowa focuses on the Des Moines metropolitan area's documented 14 percent increase in 10-year storm events since 2000 per National Weather Service records. Projects must locate within the Walnut Creek and Fourmile Creek watersheds where the Iowa Flood Center has mapped 2,300 properties at repeated flooding risk. Cost controls must reflect Iowa's aggregate trucking distances averaging 85 miles from quarries, which exceed national averages.
Green Infrastructure Specifications in Iowa Des Moines applicants must align installations with the city's 2023 Green Infrastructure Master Plan targeting 180 acres of new permeable surface by 2030. Projects require coordination with the Des Moines Water Works for downstream water quality monitoring at the Raccoon River intake.
Iowa's Geographic and Economic Context Iowa's agricultural economy generates 25 percent of state GDP, requiring green infrastructure designs that accommodate heavy farm equipment crossings on perimeter roads. The state's 94 percent rural land coverage outside Des Moines limits material suppliers, necessitating documented delivery schedules accounting for 55 mph wind gusts common in spring months.
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