Caddell Drain Rehabilitation Project
Traversing residential and commercial lands, the Caddell Drain was adversely impacted from hydrologic changes and past practices associated with stormwater management. As a result, streambank erosion, sediment transport to the Upper Rouge River, public health and safety, and poor water quality were of concern. Flashy hydraulics, poor floodplain connectivity, and failure of previous stabilization measures (gabion baskets and mats) were identified as the source of impairments and channel instability.
FTCH was retained by the Oakland County Water Resources Commissioner to employ nontraditional streambank protection measures to create a stable and natural looking channel that would significantly reduce long-term maintenance costs, ensure public safety, and protect buildings and infrastructure.
FTCH conducted detailed analysis and natural channel design techniques were used. Failed gabion baskets were removed and floodbenches were created to improve floodplain connectivity. Riffles were installed to stabilize and control steep grade. FTCH relocated 200 lf of channel to protect buildings and created 278 lf of new channel in an in-line detention basin. The new channel significantly improved water quality and flood storage capacity. Significant cost savings were achieved as spoil from floodbench excavation and stones from gabion baskets were used to construct the new channel.
FTCH prepared and obtained permits and coordinated extensively with resource agencies throughout the permitting process to ensure design permitability and compliance. FTCH provided construction oversight and coordination. Efforts from this project will significantly reduce maintenance costs, as stable morphology has been achieved and maintained.