The rainwater hopper is divided into 87 type, 79 type, 65 type, siphon type rainwater bucket, weir type rainwater bucket three categories. General use type 87 (type 79, type 65 Edition) and siphon rain water bucket. Details of "civil engineering design technical measures - water supply and drainage". Among them, 65, 79, 87 represent the age of the atlas.
In rain bucket roof rainwater into rainwater pipeline by the gutter at the entrance. The rainwater hopper rectifier grid device, can rapidly eliminate roof rainwater, grid with rectification, to avoid the formation of large eddies, stable water level reduction aeration bucket, quickly ruled out the roof rain and snow, and can make more debris barrier (mainly depends on the grating plate side), don't let it into the pipe, if is a siphon rain bucket, it should have forced the destruction of vortex sheet (in the water bucket, middle level) rain flooded the water bucket on forced vortex damage when the air inlet stop