These days, it has become much more important to be proactive with underground infrastructure maintenance as opposed to reactive. Ultimately, it saves time and money to take preventive measures as opposed to fixing issues as they arise. One of the ways RJN is able to do this is by effectively using risk analytics to determine the best course of action for its clients.
Recently, RJN worked with the City of Richardson, Texas, to support its ongoing CMOM and master planning efforts by conducting a risk-based sewer study. The program focused on evaluating existing CCTV footage, identifying hydraulic capacity issues, and assessing the risk of asset failure. The goal was to provide the City with the information necessary to help develop and plan for remedial measures for sewer lines. This information also would help the City plan for re-inspection and maintenance schedules for assets that were structurally sound.
The approach involved validating the CCTV NASSCO PACP classifications. RJN worked with the City to define city-specific risk parameters. Leveraging the features of InfoMasterTM, risk analytics measured the Likelihood and Consequence of Failure and prioritized improvements through “decision-tree” logic, both driven by unique City criteria. A comprehensive hydraulic analysis was also conducted to evaluate capacity issues, providing yet another layer of detail for the risk analysis to develop a sound long-term plan to improve the collection system. Captured flow monitoring data calibrated the hydraulic model for the capacity evaluation. Ultimately this risk-based sewer study provided the City with a solid foundation for future O&M programs as well as capital planning efforts.
The initial basin study provided the City with valuable information that facilitated its ongoing Capital Improvement Planning and CMOM program. This program is continuing by performing risk studies in other basins, developing master plans, and conducting comprehensive condition assessments to provide data for the CMOM. Follow-up manhole inspections, smoke testing, and dye water testing are locating structural defects in manholes and connections and will be used to estimate inflow/infiltration entering the City’s sanitary system to address I/I remediation for capital planning and master planning.
How Risk Analysis Is Meeting Project Goals
RJN used risk analysis—Consequence of Failure (COF) and Likelihood of Failure (LOF)—to prioritize the sewer lines within the initial basin. RJN engineers then developed a decision tree in conjunction with the City to develop remedial measures for sewer lines in need of rehabilitation along with re-inspection and maintenance schedules for sewer lines that are structurally sound. Capacity improvement recommendations identified through hydraulic modeling simulations were also incorporated into the risk analysis and the prioritized list of recommendations.
How RJN Used Asset Management Tools to Help the City
A risk matrix was developed to incorporate the COF and LOF analyses into one overall prioritization ranking and also provided the foundation for the decision tree process.
RJN used the decision tree to generate a plan of action for each sewer line analyzed. By having a prioritized list of remedial measures, it allows the City to truly focus their rehabilitation dollars where they are needed most. The re-inspection schedule allows the City to monitor sewer lines that do not currently need repair and catch the point in the future when the sewer line should be replaced before it fails, thereby preventing exorbitant, unexpected expenses as well as service disruptions.
To learn more about the asset management work being done in Richardson, including project metrics and a services profile, visit RJN’s website by clicking here.
Being Proactive Is Critical
As shown throughout this feature, being proactive about system maintenance is key to the success of wastewater system improvement programs. Don’t make the costly mistake of waiting until something breaks to fix it—take precautionary measures much earlier. This will ensure that your system is always working efficiently and without conflicts. This will save you money and time over the long term.