Neighborhood Sewer Rehabilitation Project Southwest Wastewater Treatment Plant Service Area/Houston, Texas


Construction Cost: $5 million


Project Description: Design rehabilitation methods for approximately 50,000 LF of sewers and 325 manholes in the City of Houston Southwest Wastewater Treatment Plant Service Area.  The sewers ranged in size from 6 to 48 inches in diameter.  Slip lining, pipe bursting, remove and replace and cured-in-place were the rehabilitation methods available.

Services Provided: As subconsultant, RBI was responsible for all of the rehab design.  The RBI design effort began with a thorough review of all available physical inspection tests and reports, including all manhole inspection reports and all television inspection videotapes and reports, for all sewers in the areas proposed for rehabilitation.  Also included in this effort was the review of the hydraulic modeling results for these sewers.  As a result of this preliminary design effort a recommendation was made and approved, that allowed for the television inspection of adjacent mainline sections which had not been internally inspected previously and, if found to be in poor structural condition and in need of rehabilitation, to allow these sewers to be included in our rehabilitation design effort.  This additional and subsequent television inspection effort resulted in a more comprehensive and thorough sewer rehabilitation effort in the target neighborhoods to reduce and minimize future disruptions and inconvenience to the area residents, allow for continuity of the contractor’s work effort and provide the benefit of “economy of scale” to the contractor and in turn savings to the City.  Our rehabilitation design was tailored to follow all City of Houston guidelines and procedures established for sanitary sewer rehabilitation and selected the most appropriate rehabilitation method available for the least cost.

Our rehabilitation design engineering effort resulted in the recommendation to rehabilitate approximately 26,000 linear feet of sewer by pipebursting, 10,000 linear feet of sewer by the cured-in-place method, approximately 8,000 linear feet of sewer by sliplining and approximately 2,000 linear feet of sewer by removal and replacement.  Additionally, 300 existing manholes were proposed for rehabilitation by either removal and replacement or wall sealing.  Also included in rehabilitation design for manholes was the installation of inflow protectors beneath the covers of manholes located in ponding areas, cover and/or cover frame replacement and chimney seals between the manhole corbel and cover frame.

Our Mission
Is to develop a close working relationship with our clients to meet their engineering and architectural challenges professionally, ethically and cost effectively. Each client's need becomes Ratnala & Bahl, Inc. objective.
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