Water fl ows from the fi rst reservoir to the second over a rectangular weir with a width-to-head ratio of 3. Th e height P of the weir is twice the head. Th e water from the second reservoir fl ows...

Water fl ows from the fi rst reservoir to the second over a rectangular weir with a width-to-head ratio of 3. Th e height P of the weir is twice the head. Th e water from the second reservoir fl ows over a 60° triangular weir to a third reservoir. Th e discharge across both weirs is the same. Find the ratio of the head on the rectangular weir to the head on the triangular weir.