Cool Branch (Tubbs Branch tributary)Cool Branch is a long 2nd order tributary to Tubbs Branch in Sussex County, Delaware.CourseCool Branch rises about 2 miles northwest of Sycamore, Delaware, and then flows northwest to join Tubbs Branch about 0.5 miles south of Concord.WatershedCool Branch drains of area, receives about 45.0 in/year of precipitation, has a wetness index of 681.87, and is about 8% forested.