I have a site with a newly constructed 50 foot long 3:1 slope. Rills are forming from overland flows from a 5 acre mildly graded area above it that is overtopping the crest that is about 600 feet long. Wattles seem like they be an option, but I'm not sure if the application is appropriate to protect a slope that is getting flows from above I haven't found any information if there is a cfs/ft flow rate that would be a max or something like that. At what point are wattles inappropriate, and a drainage blanket would be needed, or is it just a cost analysis once you start needing so many wattles? Are there any references that can be recommended?
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