Uttarakhand amended the Uttarakhand River Rafting / Kayaking Rule 5-1 (2014) for the second time. In 2015, permit application submission period was revised for all rivers. And the rules were same for all the rivers. Although, in 2016, the submission period has also been revised, the rules are not same for all the rivers. A special season has been earmarked for submitting the permit application for commercial rafting in Ganga.
Have a look at the amended Rule 5:
A period defined in the advertisement given by the Uttarakhand Tourism Development Board (UTDB) Other rivers: any month