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Glenn Heights adopts amended drainage design manual to use Atlas 14 rainfall data and stricter standards
Summary
Council adopted ordinance O-13-25 to amend the city’s drainage design requirements: mandatory pre-development meetings, updated NOAA/Atlas 14 rainfall data, clarified downstream analysis, freeboard and detention-basin criteria.
Glenn Heights City Council adopted an amendment to the municipal code that updates technical drainage-design standards and clarifies requirements for new development.
Parviz Prozisian, director of planning and development services, said the ordinance amends chapter 13 (utilities) to incorporate changes staff and the city’s engineering consultants developed over several months. Key changes include a requirement that "every single project" have a pre-development meeting with staff; adoption of updated rainfall tables using NOAA’s Atlas 14 data to reflect current rainfall intensities; revised equations for time-of-concentration; clarified downstream-analysis distances for larger projects; freeboard requirements (minimum 1 foot above the mapped 100-year elevation for structures) and detention-basin cross sections and setbacks to prevent development too close to main creeks.
"A lot of these changes are technical in terms of terminology, equations, tables," Prozisian said, and staff recommended approval. Council approved ordinance O-13-25 on second reading by unanimous vote.
The ordinance gives staff clearer criteria to require engineering analyses and to limit building near flood-prone creeks; implementation will be through permit review and pre-development meetings.
