Katy vs Rosenberg
How do grading & drainage rules compare between Katy, TX and Rosenberg, TX?
Rosenberg has fewer restrictions than Katy.
Katy, TX
Fort Bend County
Katy's minimum construction standards require storm sewers to contain a two-year storm without surcharging at minimum 0.1% gradient using Class III concrete pipe and follow Harris County PCPM hydrology standards.
View full Katy rules →Rosenberg, TX
Fort Bend County
Rosenberg requires lot grading plans, drainage area maps, and on-site and off-site drainage system plans for subdivisions, with reviews coordinated through the City Engineer and Fort Bend County Drainage District.
View full Rosenberg rules →Key Facts Comparison
| Fact | Katy | Rosenberg |
|---|---|---|
| Design storm | 2-year, no surcharge | - |
| Min gradient | 0.1 percent | - |
| Pipe class | Class III RCP | - |
| Channel standard | HCFCD PCPM 2019 | - |
| Reviewer | City engineer | - |
| Required plans | - | Lot grading and drainage map |
| County review | - | Fort Bend Drainage District |
| City review | - | City Engineer |
| Authority | - | UDC Chapter 4 Subdivisions |
Highlighted rows indicate differences between cities.
Katy FAQ
What design storm do storm sewers handle?
Storm sewers in Katy must contain a two-year storm event within the pipe without surcharging, per the city's minimum construction standards.
Which pipe materials are accepted?
Class III reinforced concrete pipe is the standard. Alternatives require approval from the city engineer along with calculations supporting the substitution.
Do open channels need detention design?
Yes. Open channels and detention ponds must follow Harris County Flood Control District PCPM (July 2019) hydrology and design methodology in Katy subdivisions.
Rosenberg FAQ
Can I regrade my Rosenberg yard so water flows toward the neighbor?
No. Lot grading must follow the approved drainage plan and not redirect runoff onto adjacent properties; corrective regrading may be ordered if drainage is altered.
Who approves drainage plans in Rosenberg?
The City Engineer reviews drainage plans for City compliance and Fort Bend County Drainage District provides final drainage approval for subdivisions.
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