Relating Precipitation Trends to Collection System Level of Protection and Risk: A New Approach for Oklahoma City

The approach developed for Oklahoma City evaluates a total year of simulated rainfall based on historical precipitation patterns. The typical year time series rainfall was used by Oklahoma City to identify an acceptable level of protection and risk. It was also possible to define different levels of protection to different parts of the wastewater collection system and evaluate seasonal collection system performance. This is a robust analysis which uses local precipitation patterns and can be readily duplicated for any geographic location. Most importantly perhaps, it puts the decision of acceptable level of protection and risk firmly into the hands of the wastewater collection system owner.