Years of problems with inflow and infiltration in its sewer collections system inspired Rohnert Park, California, to adopt new standards when it came to designing and constructing a trunk sewer expansion.
Specifically, they rethought the way they were building up manholes. Previous projects had used standard cast-in-place processes, but now, they wanted to invest in I&I-inhibiting construction technology: monolithic base inserts.
“You can’t do too much better in our...