Selma, CA Environmental Rules: Grading & Drainage (2026)

The City of Selma regulates grading and drainage through its building code and zoning ordinance, in coordination with the Fresno Metropolitan Flood Control District. A grading permit is required for any earthwork that alters existing drainage patterns, creates slopes, or moves significant quantities of soil. Grading plans must be prepared by a licensed civil engineer and include existing and proposed contours, drainage calculations, and erosion control measures. All development must maintain positive drainage directing surface water away from building foundations and toward approved drainage facilities. Runoff from new development may not be directed onto adjacent properties or public rights-of-way without approved drainage improvements. The Fresno Metropolitan Flood Control District establishes design standards for storm drainage infrastructure, including retention basins, storm drain pipes, and channels. New developments must provide on-site stormwater retention or connect to the District's storm drain system with approved capacity. Lot-to-lot drainage is prohibited. Downspouts and roof drains must be connected to an approved drainage system or directed to landscaped areas that can absorb the runoff. Retaining walls over 4 feet in height (measured from the bottom of the footing to the top of the wall) require a building permit and engineered plans. Grading that creates slopes steeper than 2:1 (horizontal to vertical) requires slope stabilization measures. The Building Department and Public Works Department review grading plans and conduct inspections during construction.