Friese Nichols presents Midwest City wastewater master plan; consultants and staff outline prioritized repairs, inspections and funding needs

City staff and consultants from Friese Nichols presented a wastewater master plan that analyzes Midwest City’s sewer collection system and recommends a phased capital and rehabilitation program.

The firm said the study expanded the previous East Side capacity work into a citywide analysis that combined hydraulic modeling, 60 days of flow monitoring (18 flow meters and four rain gauges), 300 manhole inspections and a desktop risk assessment. The model evaluated both existing and projected future flows (through 2050), applied a design storm with a 20% annual exceedance probability to identify surcharging and capacity shortfalls, and produced a prioritized project list grouped into 0–2, 2–5, 5–10 and 10–20 year buckets.

Consultants and staff identified two principal program strands: capacity improvements (to address lines that surcharge under wet- and projected future-load conditions) and rehabilitation/replacement (to address aging pipe material, work-order history and condition). The study assigned each pipe a composite risk score that combined criticality (consequence of failure) and condition (likelihood of failure) to help set priorities. Fifteen of the city’s…