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2020 ENR Top 500 Design Firms List: WGI Moves Up to #187
WGI moves up 37 spots on Engineering News-Record (ENR)’s 2020 Top 500 Design Firms List.
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Many factors contributing to the design and analysis of stormwater infrastructure and detention have been updated this year to include: detention rates, drainage determination, and floodplain mitigation, which have been a result of new NOAA Atlas 14 Precipitation-Frequency Data (Link to NOAA Precipitation Frequency Data).
These changes are effective immediately and will result in an increased detention pond volume and underground storm infrastructure. A summary of these changes are illustrated below:
Detention Rates
Harris County
Outfall Location/Method*:
*Reference Section 6.03.1.2 of the Harris County Design Manual
City of Houston
Tract Size**:
**Reference Section 9.2.01.H of the City of Houston IDM
Storm Infrastructure Sizing – is based on the updated Atlas 14 rainfall data. Reference Table 9.1 in the City of Houston IDM.
Floodplain Mitigation
Although Floodplain mitigation/regulations have not been updated since January 2018 (Harris County) and September 2018 (City of Houston), the impacts are significant and costly.
City of Houston
The effective areas include both the 100 and 500-year floodplain and yield zero net fill across the site. Zero net fill can result in structures being on an elevated foundation with crawl space or piers and additional detention volume or cut throughout the site. Foundations within the 500-year floodplain must be a minimum of two feet greater than the floodplain elevation.
Harris County
Fill may not be utilized in elevating structures, rather open foundations/piers are allowed in the 100 and 500-year floodplain. Minimum finished floor elevations (FFE) for the 100-year are 2’ about BFE and 1’ above BFE for the 500-year (Shaded Zone X only). Zones other than Shaded Zone X generally have greater restrictions for minimum FFE elevations. Like the City of Houston, Zero Net Fill is required within the 500-year floodplain.
WGI is a national design and professional services firm leading in technology-based solutions for the construction of public infrastructure and real estate development. At WGI, we’re providing Tomorrow’s Infrastructure Solutions Today.
WGI moves up 37 spots on Engineering News-Record (ENR)’s 2020 Top 500 Design Firms List.
WGI is celebrating EWeek 2020 by honoring all of our dedicated engineers, and engineers around the world that have made a positive contribution to our profession.
WGI makes a very significant 41-spot jump from last year’s Hot Firm ranking of #76.
It’s important to know the environmental rules and regulations before you get started on your project that may contain or be near wetlands.
WGI associates got their feet wet in San Antonio, TX where they attended Texas Water 2022, the largest regional water conference in the U.S—widely recognized as the premier water and wastewater conference in the Southwest.
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