It is the purpose of this Part to implement the policy of the State with regard to the release and diversion of waters from certain reservoirs, as set forth in title 8 of article 15 of the Environmental Conservation Law. Accordingly, it is the purpose of this Part to regulate the volume and rate of change of diversions of water from the Schoharie reservoir through the Shandaken tunnel into Esopus Creek, in order to protect and enhance the recreational use of waters in Esopus Creek in a manner consistent with the protection of existing recreational uses of the Ashokan and Schoharie reservoirs, while ensuring and without impairing an adequate supply of water for power production or for any municipality which uses water from such reservoirs for drinking and other purposes.