This study provided a better understanding of the effectiveness of existing sump manholes and catch basins by documenting sediment volume data from actual structures in urban watersheds. Often influent concentrations in urban environments are assumed to have a particle size distribution (PSD) similar to NURP 50 (EPA 1983), and this study addressed if this is a valid assumption for urban watersheds.
This study also illustrated how SHSAM can be used to estimate effective maintenance schedules. Characterization of sump sediments provides a better understanding of the pollutant hazard to the environment. Characterization also provides an understanding of the sediment disposal options available.