Waterfall accessible after a hike of about 1 hour from Huay Tueng Thao Reservoir.
The path to the waterfall is about 6 km round trip. 300 m of elevation gain. At times the path can be hard to find with falling trees, follow the GPS carefully. No big difficulties.
You have to pay 50 Baht to enter the Huay Tueng Thao Reservoir area.
Google map parking : https://goo.gl/maps/hMC46jQVB3arYUWk6
Google map waterfall : https://goo.gl/maps/5UZuxigr7RLqPDQq6
GPS track of the hike : https://www.alltrails.com/fr/randonnee/thailand/chiang-mai/huay-tueng-tao-dtaat-mook-waterfall-2