Design of true half-round roof eaves gutters

Abstract

In this paper the design of true half-round roof eaves gutters is based on a complete solution of the governing unsteady flow equations for open-channel flow. The predicted flow capacity for a short horizontal gutter of any diameter is compared with previously obtained equations which were based solely on experimental data. Reduction factors applicable to this equation are obtained for long horizontal gutters. In addition, the flow capacities of gutters laid to standard falls of 1 in 600 and 1 in 350 are determined, showing that for gutters laid to a fall of I in 600 the capacity is almost constant irrespective of its length, and for gutters laid to a steeper fall the capacity increases slightly with increasing length of gutter.