Grading and drainage in Spring Hill is reviewed by Hernando County Stormwater Management and the Building Department under the Hernando County Code, the county's Land Development Regulations, and the 8th Edition (2023) Florida Building Code. Detention/retention structures must be designed with a minimum of six (6) inches of freeboard between the design high water elevation and the lowest provided berm elevation. Sites disturbing one acre or more also need a FDEP Generic Construction Permit (Notice of Intent) plus an on-site SWPPP, and SWFWMD Environmental Resource Permit compliance under FAC 62-330. Spring Hill's geology — Karst limestone topography of the Brooksville Ridge with abundant sinkholes and closed basins — makes drainage planning especially important.
Hernando County grading and drainage rules combine three layers: (1) the Hernando County Code and Land Development Regulations, enforced by the county; (2) county engineering standards and the Florida Building Code; and (3) the Southwest Florida Water Management District (SWFWMD) Applicant's Handbook implementing FAC 62-330 for Environmental Resource Permitting. The county requires a minimum six (6) inches of freeboard between the design high water elevation and the lowest provided berm elevation surrounding detention/retention structures. Drainage plans submitted with site permits must show existing and proposed runoff calculations, demonstrate that historic rate and pattern of runoff to adjacent property is not increased, size on-site conveyance to safely pass the design storm event, and provide water-quality treatment to meet SWFWMD criteria. Spring Hill's underlying geology is karst limestone of the Brooksville Ridge — abundant sinkholes, closed-basin sinks, and ephemeral wetlands act as natural drainage outlets and as flood-hazard features; many lots drain into private sinks rather than to a curb, and altering historic drainage to a sink can trigger county and SWFWMD review even outside the regulated 1-acre threshold. Sites of one acre or more disturbance (or part of a larger common plan) must also file a Notice of Intent (NOI) with FDEP for the statewide Generic Construction Permit and maintain a Stormwater Pollution Prevention Plan (SWPPP) on site; perimeter BMPs (silt fence, vehicle tracking control pads, inlet protection, concrete washout) must be installed before ground disturbance. Lots within the SFHA have additional grading constraints driven by the county floodplain ordinance (Hernando County Code Chapter 13) and FBC §1612 (BFE + freeboard). Contact: Hernando County Stormwater Management, Public Works, 1525 E. Jefferson St., Brooksville, FL 34601, (352) 754-4060. Building Department: (352) 754-4050.
Grading or drainage work that deviates from the approved Drainage Plan, fills a regulated wetland or sinkhole, or aggravates off-site flooding violates the Hernando County Code and the conditions of the development approval. Enforcement runs through Code Enforcement and the county Special Magistrate at up to $500/day under FS 162.09, plus Stop Work orders and refusal to issue Certificate of Occupancy until as-built grading is verified. Aggravating off-site flooding to a neighboring property exposes the owner to civil liability under Florida common-law surface-water/nuisance doctrine. Sites of one acre or more operating without an active FDEP NOI face state penalties up to $10,000/day under FS 403.121. Failure to maintain stormwater treatment facilities to SWFWMD ERP standards can result in ERP revocation and state enforcement.
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