"Modal contact time" means the amount of time elapsed between the time that a tracer, such as salt or dye, is injected into the influent at the entrance to a chamber and the time that the highest concentration of the tracer is observed in the effluent from the chamber.
Cal. Code Regs. Tit. 22, § 60301.600
Note: Authority cited: Section 13521, Water Code. Reference: Sections 13520 and 13521, Water Code.