Tomball requires grading and drainage plans for development projects to ensure proper site drainage and prevent water from flowing onto adjacent properties. Grading permits are required for significant earthwork. All lots must drain to public streets or approved drainage facilities rather than onto neighboring properties.
Tomball requires development projects to submit grading and drainage plans as part of the site development permit process. Plans must demonstrate that finished grades direct stormwater to public streets or approved drainage facilities, not onto adjacent properties. Grading permits are required for filling, excavating, or otherwise disturbing land above threshold quantities. All residential lots must maintain positive drainage away from structures with a minimum slope of 2% for the first 10 feet from the foundation. Alteration of existing drainage patterns that causes flooding on adjacent properties is prohibited. Drainage easements must be kept clear of structures, fences, and obstructions that impede water flow. The city requires professional engineering for subdivisions and commercial projects. Driveway culverts must be sized according to city standards to maintain roadside ditch flow capacity. Contact Public Works at (281) 290-1012 for grading permit requirements and drainage standards.
Grading without a permit carries fines up to $2,000 per day. Altering drainage patterns that cause flooding on neighboring properties triggers enforcement action and required remediation at the responsible party's expense. Obstructing drainage easements may result in citations and forced removal.
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