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Engineers warn failing Pine(s) spillway threatens Warr Acres sanitary interceptor; OWRB review underway
Summary
City engineers told the Warr Acres council that erosion and spillway failure at the privately owned Pine(s) dam have begun to expose a sanitary sewer interceptor that carries an estimated 80% of the city's wastewater, prompting a dam‑breach analysis submitted to the Oklahoma Water Resources Board and a proposal for coordinated pipe casing and spillway repairs funded in part by ARPA and the HOA.
Engineers told the Warr Acres City Council that erosion at the Pine(s) homeowners association dam has already damaged the downstream spillway and is beginning to expose a sanitary sewer interceptor that runs beneath it, creating a significant risk to the city's wastewater system.
Consulting engineer (Speaker 13) said the team ran hydrologic and hydraulic scenarios — sunny-day breach, design flood, breach/non‑breach and near‑overtopping — and submitted a dam‑breach analysis to the Oklahoma Water Resources Board (OWRB). The analysis, the engineer said, indicates the lake and downstream systems can be managed without loss of buildings under most modeled scenarios, and OWRB is reviewing the report with an anticipated determination by year‑end.
Why it matters: city staff explained the sanitary interceptor that crosses the dam carries the majority of the city's sewage flow; staff later said about 80% of the city's wastewater travels through that pipe. Councilors and staff warned that if the spillway fails further and the pipe is exposed or damaged, the city faces service disruption, costly emergency repairs and potential regulatory penalties for discharges.
What was proposed: the consultant presented a preliminary spillway redesign — a concrete trapezoidal channel sized to pass the 25% probable maximum flood used in the model — and recommended a project that pairs spillway reconstruction with replacement or casing of the sanitary pipe. Staff said the project would be funded as a joint effort with the HOA; ARPA funds were used to pay for the study because failure would directly threaten the city's sewer asset.
Process and timing: the engineer said the OWRB asked that the team conduct a dam‑breach analysis so the dam might be reclassified from "high" to "low hazard," which would remove OWRB annual inspection requirements for the HOA if the evidence supports reclassification. The report is under OWRB review and staff hope to have results by the end of the year; construction documents would follow and the HOA would be expected to contribute to repairs.
Council reaction and next steps: members pressed for maps showing the connection points to Oklahoma City sewer lines, for clearer cost estimates, and for a coordinated work plan that sequences casing/pipe protection and spillway construction. Staff said the city will continue design work, coordinate with the HOA and OWRB, and bring construction documents and estimated costs back to the council for any required commitments.
The council did not adopt construction contracts at the meeting; city staff said they will return with final drawings, cost shares and any required interlocal agreements before work begins.
