Arapahoe County Land Development Code §4-4 requires grading permits for excavation or fill over 100 cubic yards or slopes over 3 feet. Aurora City Code §22-170 thresholds similar. Drainage must not redirect water to neighbors. Retaining walls over 4 feet require engineering. Colorado freeze depth 30-36 inches affects foundations.
Grading and drainage regulations in Arapahoe County are codified at multiple levels. Arapahoe County Land Development Code §4-4 requires grading permits for excavation or fill exceeding 100 cubic yards, or creation of slopes over 3 feet in vertical difference. Aurora City Code §22-170 et seq. applies similar thresholds, with additional requirements for slopes exceeding 3:1 gradient. Centennial requires grading permits for disturbance over 100 cubic yards or slope creation over 5 feet. Colorado's natural topography ranges from plains in eastern Arapahoe County to foothills in the west, creating varied grading challenges. Drainage rules (Colorado common law and C.R.S. §37-83-101 et seq.) prohibit property owners from redirecting natural drainage onto neighboring properties in ways that cause damage. Grading plans must direct stormwater to approved discharge points—typically the public right-of-way or private detention facilities. Retaining walls over 4 feet (measured from bottom of footing to top of wall) require engineering design and separate permits in most Arapahoe County jurisdictions. Walls over 6 feet need specific IBC review. Foundation compaction testing typically required for structural fill (95% Standard Proctor). Colorado's semi-arid climate creates expansive soils (bentonite clay) requiring soil reports for new construction. Freeze depth is 30-36 inches in the Denver metro affecting footings and plumbing. Mile High Flood District criteria govern drainage design.
Unpermitted grading: stop-work order and fines $250 to $2,500. Redirecting drainage to neighbors: corrective action, civil liability for damage. Slope failure from improper grading: remediation costs plus liability. Retaining wall without engineering: removal or redesign order.
Centennial, CO
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Centennial, CO
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Centennial, CO
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Centennial, CO
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Centennial, CO
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Centennial, CO
Centennial approved a 14-day street parking limit for regular vehicles in residential areas. After 14 days, the vehicle must be off the street for 7 consecut...
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