call the waterboard they are nice guys... two aspects to deal with...Water rights...is one dept. You have to have the right to divert water on Private landand federal Blm land in most cases especially on a claim or locatable ground you do have the water rights "Riparian"...Then theres the dischare and waste side...call them ask for a permit...if you are a small scale guy they don't even have a permit for you. the guy told me" Hmmmm your doing what? sounds like a bit of a gray area"" im gonna have to ask around".....I got off the phone without ever being told how to apply for a permit... He mentioned I may need a streambed alteration permit...wichI know I dont... I also went to the Mothelode field office for BlM as there was a post a while back stating that they don't allow Powersluicing....I now have a letter from them stating that I can powersluice as long as I am not dischargeing into a live waterway. There is a chance the waterboard will tell you that you need to file a notice of diversion...you fill out info and they file the notice ..do it f you want or not.. I AM NOT SAYING I HAVE ALL THE ANSWERS...this is just what I got from a few hours of phone calls and office visits...Gravelwasher has seen my BLM letter...please if you call the waterboard be tactful don't say this guy online said this or that bla bla bla....play Ignorant and make them answer...I hesitated and have sat on this info for months now as I like many small scale miners don't like to draw to much attention to certain things..., I just don't like how some here are saying it is not allowable and you will be fined gobs of money....there are hundreds of trommels and powersluices running in California legally and they are not being cited...there are a few guys here Kuger, Vini,Neotokyo Reed lukins,Trinityau...2cmoreau,Dagreat...any of you who know Gravelwasher...63bkpacker...if you want this info pm me i will forward my blm letter and some waterboard direct lines with phone numbers....i will pick and choose if i get anyother requests.