Boise requires grading and drainage plans for development projects under Title 11 development standards. The city's terrain, including the Boise Foothills, creates unique drainage challenges. Projects must demonstrate that post-development drainage does not adversely affect neighboring properties or public infrastructure.
Development projects must submit grading plans showing existing and proposed contours, drainage patterns, and stormwater management. Grading in the Boise Foothills is subject to additional standards due to steep slopes and wildfire risk. Projects must ensure post-development runoff rates do not exceed pre-development conditions. Drainage must be directed to approved facilities and cannot be concentrated onto adjacent properties. Retaining walls over four feet typically require engineering and building permits.
Grading without required permits can result in stop-work orders and fines. Property owners who alter drainage patterns causing damage to neighboring properties may be liable for corrective action and damages. The city may withhold building permits until grading deficiencies are resolved.
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See how Boise's grading & drainage rules stack up against other locations.
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