California Code, Fish and Game Code - FGC § 6022

(a) Diversions under three cubic feet per second capacity shall not be required to bypass more than 18 gallons per minute.

(b) Diversions of three cubic feet per second or more, but under 10 cubic feet per second, shall not be required to bypass more than 30 gallons per minute.

(c) Diversions of 10 cubic feet per second or more, but under 20 cubic feet per second, shall not be required to bypass more than 40 gallons per minute.

(d) Diversions of 20 cubic feet per second or over shall not be required to bypass more than one-half of 1 percent of the capacity of the diversion.

(e) Diversions built by the Government of the United States and requiring bypasses longer than one-quarter mile shall bypass such amount of water as is necessary to return fish to the permanent channel satisfactorily.