Large Diameter Waterlines

A+ Services has continued putting its ingenuity and vast pipeline engineering expertise to work to deliver water pipeline solutions to clients across the US. Our growing professional staff provides the full range of services from feasibility studies to design, engineering and project delivery. Services include:  Conceptual design; Condition assessment; Construction management; Issues during construction; Metering stations; New Design; Retrofitting; Value engineering


walking inside the pipe, pipeline engineering  






A sampling of recent projects includes:

108” Northwest Transmission Waterline, Smith Road to Bellow Falls—City of Houston, Houston, TX

This project is part of the Northeast Transmission Waterline, a multi-year project designed to carry treated surface water produced by the planned expansion of the City of Houston’s Northeast Water Purification Plant. This project consists of approximately 10,000 LF of 108” water transmission line along multiple City of Houston easements from Bellow Falls to Smith Road. One of the main challenges encountered in this project includes the constructability issues in placing the proposed 108” line in close proximity to an existing 84” parallel line. A+ Services is providing engineering support to the lead design firm on the analysis of the maximum allowable load on the existing 84” line and minimum separation distances between the two lines. A+ Services is also designing the interconnect details to the existing 84” line. Other engineering services provided include a review and analysis of the project’s geotechnical report, constructability reviews on project submittals, a review of the project’s design details, and coordination with vendors on pricing for major items.


108” Waterline, UPRR to John Ralston—City of Houston, Houston, TX

Aurora Technical Services was selected by the City of Houston as the prime to design almost 8,000 LF of 108” water transmission line. The waterline has numerous challenges that include; installation of the new line adjacent to an existing 84” waterline (that cannot be taken out of service), several tunnels requiring close attention to the potential impact to railroad operations and the BW 8 main lanes.  Furthermore, this project will involve a number of critical crossings of roadways and petroleum/gas pipelines. The estimated construction cost for the project is between $22M and $28M. The ongoing design includes coordination with HCFCD, TxDOT, Harris County and HCTRA, as well as several Municipal Utility Districts.


60” DIP along Dolly Wright, Dubois and Victory from the Acres Home Pump Station to Inwood Park—City of Houston, Houston, TX

This project consisted of approximately 6,800 LF of 60” WL along mostly a two lane asphalt roadway (in a 50-foot-wide ROW) with rather deep roadside ditches. Design included a discharge connection to one of the Owner’s largest regional pump stations.  Due to the service area of the pump station, the connection had to be designed to phase the work in such a manner to minimize the required shut down period of the pump station.

The project alignment extended through an historical area of town which was considered economically depressed.  Complicated the design was to need to replace the existing water distribution line located within the ROW, while at the same time avoid disturbing a parallel 21” deep gravity sewer line recently installed a few years earlier. A key consideration was the trench wall stability of the proposed 60” line when parallel to the 21” sanitary. In a few areas to protect the manholes, solid shoring was required.

Another challenge was maintaining adequate drainage while the 60” line was under construction. The project alignment was along a roadway which was over 1 foot higher than the abutting properties. During design, alternatives to discharging the groundwater was evaluated to ensure the adjacent residents’ homes were not flooded during construction.