California Department of Fish and Wildlife, Bay Delta Region 3
Upland Watercourse Restoration and Enhancement (Notification of Lake or Streambed Alteration, EPIMS Notification No. SON-22045-R3
NOE - Notice of Exemption
The project is limited to strategic placement of on-site slash material into portions of ephemeral streams (unnamed tributaries) where head-cutting and channel incision are occurring in order to reduce erosion and sediment delivery downstream, eventually to Dutch Bill Creek. In areas where incision is occurring, fresh green bows will be placed parallel to the watercourse, limb-by-limb in the channel with the tips facing upstream in an interlocked fashion. Project sites will be accessed from existing forest roads. The process of strategic parallel placement typically begins at the active knickpoint of a headcut, followed by filling contiguous segments of entrenched channel downstream. The bows will be weaved together into a dense matrix to ensure thorough contact between biomass and the bed and banks of the channel to increase filtration surface area. The end result will be a densely packed but porous matrix that disperses the flow and energy of the water while trapping soil and leaf litter, disallowing further erosion and incision of the channel and mitigating headcut migration.