As used in this part:

1. (a) “Best available technologies” means technologies at the highest technically practical level, using flow totaling devices, and if necessary, data loggers and telemetry.
2. (b) “Best professional practices” means practices attaining and maintaining the accuracy of measurement and reporting devices and methods.
3. (c) “Diversion” means taking water by gravity or pumping from a surface stream or subterranean stream flowing through a known and definite channel, or other body of surface water, into a canal, pipeline, or other conduit, and includes impoundment of water in a reservoir.
4. (d) “Person” means all persons whether natural or artificial, including the United States of America, State of California, and all political subdivisions, districts, municipalities, and public agencies.