Environmental Rules in Round Rock, TX (2026)
3 verified environmental rules for Round Rock, Texas, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Round Rock requires all new drainage systems to handle the 25-year storm in curbs and storm sewers, with the citywide system built to convey up to a 100-year event.
Round Rock Storm Drainage Design Standards
Some RestrictionsDrainage Criteria Manual § 1.2.2(B)-(C)
B. Street curbs, gutters, inlets and storm sewers shall be designed to intercept, contain and transport all runoff from the 25 year frequency storm. C. In addition to B above, the public drainage system shall be designed to convey those flows from greater than the 25 year frequency storm up to and including the 100 - year frequency storm within defined public rights-of-way or drainage easements.
Erosion Control
Round Rock requires an erosion and sedimentation control plan for any permitted construction, and a full Storm Water Pollution Prevention Plan once a project disturbs more than one acre, under the city's Drainage Criteria Manual.
Round Rock Erosion and Sediment Control Rules
Some RestrictionsRound Rock Drainage Criteria Manual § 9.3.1
All activities requiring a permit shall submit an erosion and sedimentation control plan that identifies, addresses, and minimizes to the reviewer's satisfaction all potential sources of sediment and other construction related pollution. Development/construction disturbing greater than one (1) acre shall also develop and implement a Storm Water Pollution Prevention Plan (SWPPP) as outlined in T...
Flood Elevation Requirements
Round Rock requires any structure built on a lot within or adjacent to the 100-year floodplain to have its finished floor slab set at least one foot above the 100-year flood level, fixed on the final subdivision plat.
Round Rock Floodplain Floor Elevation: One Foot Above 100-Year Flood
Some RestrictionsRound Rock Code of Ordinances § 14-119(a),(c) — Subdivision plats (Ch. 14, Art. V, Stormwater Drainage)
(a) Preliminary plans for subdivisions shall show the limits of the 25- and 100-year floodplain for all waterways drainage 50 or more acres. ... (c) The final plat shall establish specific minimum floor slab elevations for construction of any structures on a lot adjacent to or within and adjacent to any 100-year floodplain area to assure future structures are constructed a minimum of one foot a...
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County ordinances apply to unincorporated areas and may supplement Round Rock city rules.
Environmental Rules in Williamson County →