Dunedin requires drainage plans and proper lot grading for new construction and site development. Plans must show finished grades, retain stormwater on site where required, and meet minimum pipe size and storm-event design standards.
Site or plot plans submitted to Dunedin must include a proposed drainage plan with finished grades, lot drainage patterns, and infrastructure connections. The city's infrastructure site plan checklist requires a minimum 15-inch reinforced concrete pipe diameter (unless an alternative is approved), with maximum 400-foot distance from a stormwater ridgeline to an inlet, and maximum 450 feet between access structures. Designs must accommodate at least the 10-year storm with a 15-minute minimum time of concentration, and the hydraulic gradient must be at least one foot below gutter elevation. Parking lots must be graded to drain away from adjacent property and public streets, surfaced with erosion-resistant materials, and discharge consistent with the stormwater management ordinance.
Improper grading or unapproved drainage modifications can trigger stop-work orders, mandatory regrading at the owner's expense, daily fines, and refusal of certificates of occupancy.
See how other cities in Pinellas County handle grading & drainage.
See how Dunedin's grading & drainage rules stack up against other locations.
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