CDM Smith sewer-flow study shows prior projects reduced inflow; council approves study

Sep 10, 2026

Council reviewed a CDM Smith memo and approved a sewer flow study showing that earlier targeted projects significantly reduced inflow and infiltration (INI), with future projects expected to yield smaller marginal improvements.

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Council considered the sewer flow study prepared by CDM Smith. Staff summarized that the city targeted larger contributors to inflow and infiltration first (relining terracotta sewers, manhole repairs near the treatment plant) and that those projects produced the largest reductions; future projects will have diminishing marginal returns.

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