Remove and replace approximately 325 LF of a PCC low flow trickle channel within Cottonwood Park, with varying proposed sections, running generally north/south along east extents. Low flow trickle channel sections will vary and include grouted rip rap, drain gravel, and geosynthetic material separation fabric. Includes pre-cast or cast-in-place PCC storm drain outlet structure, PCC retaining wall, and minor storm drain extensions. Surfacing will include PCC grouted riprap surfacing, drain pan, channel access, access approach along 4-J Road, and sidewalks. Project includes grading for channel, detention pond and overflow berm. Revegetation and erosion control will be required. Existing irrigation system will need to be adjusted. Minor fencing and landscaping components to be removed and reset as needed. Alternate work located at the west extent of Cottonwood Park will include disconnecting and rerouting RCP storm drain pipe, plugging existing pipes, minor grading, installing PCC drain pan, and riprap surfacing