Corrosion Control for City of Houston Water and Wastewater Group
The city of Houston called on EN Engineering to assist with a corrosion control project for their Water and Wastewater Group. The project is the Corrosion team’s largest water project to date.
Houston is the fourth largest city in the country, so the initial challenge included locating the hundreds of corrosion control systems that needed to be assessed. Once located, the team documented locations to create a historical record of corrosion data for future reference and began the large-scale assessment process. The project continues with ongoing monitoring and maintenance.
The scope of the five-year project includes maintenance of the current system, design of new systems, and analysis on lines that fail. The project involves all of the large diameter water mains, facilities, and wastewater systems throughout the city.
During the initial months, the EN Engineering team began locating and assessing the current corrosion control systems by identifying and visiting all the pipelines and facilities around the city. The team went out with metal detectors to find the caps that lead to the water lines. Once located, a GPS reading was taken and the information was entered into a GIS mapping database to make the process easier in the future. The team used a GIS mapping tool and added information on water lines and test stations to the city’s map to help determine where the lines are located and enable the team to assess CP levels by regions. The GIS tool also created a historical record of corrosion data for future reference.
Following completion of the identification and assessment of all the locations, the city requested that the EN Engineering team focus on stray current studies of the mainline water lines in the area of the Metro Light Rail system. In addition, they asked the team to help update the city’s GIS system and integrate all of the previously collected data, including test station readings, rectifier readings, water line leaks, soil resistivity and soil samples. Once all the information is compiled and processed, it will permanently reside within the city’s system.