As a subconsultant to three different engineering firms, Freese and Nichols completed a drainage impact analysis for drainage improvements to this two-mile major roadway reconstruction project, from Katy Hockley Road to Peek Road. The project also included park facilities, a water well and a new outfall channel, as well as a new 100-foot ROW depressed boulevard section in an undeveloped area with an underground storm that had severe depth limitations.
The primary focus of the drainage impact analysis was to determine the required amount of stormwater detention, and to identify a proposed infrastructure size and configuration that meets design criteria, is consistent with the Upper Langham Creek Frontier Program (ULCFP), and prevents impacts to the large overflow from Cypress Creek into the Addicks Reservoir. FNI utilized a 1-D/2-D hydrodynamic model using XPSTORM to analyze the study area.
FNI was able to identify the roadway profile, drainage infrastructure, maximum number of screening berms, and appropriate placement of a water well, restrooms and park pavilion based on the required detention mitigation that would cause no adverse impact. Additionally, the proposed storm sewer infrastructure and surface grading resulted in no impact to the receiving streams. FNI coordinated with the three consultants, providing sizes, alignments and elevations for all the required drainage infrastructure. FNI also reviewed construction drawings to confirm that the proposed design matched the recommendations of the drainage study.