I-45 & Scarsdale Business Park — 42-Acre Floodplain Civil Engineering in Houston, TX
Houston · Harris County · Texas
Commercial & Retail Development
Civil engineering for a 42-acre business park in the Harris County floodplain
JRH Engineering provided complete civil engineering design for a 42-acre business park in Houston, Texas, located in the Harris County floodplain and requiring simultaneous approval from both the Harris County Flood Control District and the City of Houston. JRH commissioned a floodplain routing analysis upfront to resolve modeling questions before they became review comments, concentrated detention in an otherwise unusable triangular tract, and used dock-high building design to reduce fill requirements — compressing both schedule and cost on a complex dual-jurisdiction floodplain project.
AT A GLANCE
Site civil design
Full civil design for a 42-acre business park including building pads, access roads, parking, and public road design
Public road through the center of the project designed with minimum vertical clearance over an existing pipeline — a constraint that required careful vertical alignment
Dock-high building design selected — raised dock elevations reduced the amount of fill required to bring building pads above the base flood elevation, directly reducing detention volume requirements
Detention concentrated in a triangular tract near the outfall — land otherwise unusable for building development repurposed as the site primary drainage asset
Utility infrastructure
Water and sanitary tied into the City of Houston system
Lift station minimized the detention pond footprint — more buildable area preserved adjacent to the pond
Stormwater and drainage
Floodplain routing analysis commissioned before design submittal — resolved hydraulic modeling questions proactively, preventing them from becoming HCFCD review comments
Dock-high building design directly reduced required detention volume — less fill means less impervious area impact means less required storage
Triangular tract near the outfall used for detention concentration — pond placement minimized travel distance to the outfall and used land that had no building development potential
Lift station at the pond further reduced the footprint needed for the detention facility
Permitting and agency coordination
Harris County Flood Control District and City of Houston approvals pursued simultaneously — a dual-jurisdiction floodplain project managed as a single coordinated submittal
Floodplain routing analysis resolved HCFCD modeling questions before review — fewer comments, faster response cycle
Pipeline vertical clearance resolved in the public road design before submittal
The Challenge — one of the more complex permitting scenarios in the Houston market
A 42-acre business park in the Harris County floodplain with dual-agency jurisdiction is difficult by nature. HCFCD and the City of Houston have overlapping but distinct requirements, and a hydraulic modeling question that surfaces during review — rather than before — can add months to the approval timeline. Maximizing developable area in the floodplain also requires a specific engineering strategy: every decision about fill, building elevation, and pond placement has cascading effects on detention volume requirements and construction cost.
JRH’s Approach — commissioning the routing analysis before design, not after the first comment
This proactive step resolved the hydraulic modeling questions that HCFCD would have flagged, allowing the first submittal to go in clean. Dock-high building design was selected because it reduced fill requirements, which reduced detention volume, which reduced pond size. Detention was placed in the triangular tract near the outfall — land that served no building purpose was given the highest drainage value. A lift station further compressed the pond footprint.
The Results
01
Dual-agency approval from HCFCD and the City of Houston pursued simultaneously — no sequential jurisdiction delays
02
Floodplain routing analysis completed before submittal — modeling questions resolved proactively, not in review
03
Dock-high building design reduced fill, detention volume and construction cost — cascading savings from one design decision
04
Frequently Asked Questions
What was the main engineering challenge on the I-45 & Scarsdale Business Park project?
The 42-acre business park sat in the Harris County floodplain and required simultaneous approval from both Harris County Flood Control District and the City of Houston, a complex dual-jurisdiction permitting scenario.
How did JRH Engineering manage the floodplain and cost challenges at I-45 & Scarsdale?
JRH commissioned a floodplain routing analysis before design submittal to resolve modeling questions proactively, used dock-high building design to reduce fill and detention volume, and concentrated detention in an otherwise unusable triangular tract near the outfall.
What were the results of the I-45 & Scarsdale Business Park project?
JRH secured dual-agency approval pursued simultaneously with no sequential delays, resolved floodplain modeling questions before review began, and reduced fill, detention volume, and construction cost through the dock-high building design.