Flow diverter arrangement for downspout

For use in combination with a rectangular downspout section having end and side walls for roof guttering and having an aperture formed in a side wall of the downspout section, said aperture having side edges spaced inwardly from the end walls of the downspout section and also having a bottom edge, a diverter plate receivable in the aperture, said diverter plate having a first portion disposable inside the downspout and a second portion disposable outside the downspout, said diverter plate including shoulder means for engaging the downspout on the inside laterally outwardly from the side edges of the aperture whereby the diverter plate may rest on the bottom edge of the aperture, the first portion having a width substantially equal to the distance between the end walls of the downspout section and said second portion having a width substantially equal to the distance between the side edges of the aperture, said diverter plate being tiltable in the aperture and having a first position wherein said first portion may incline angularly upwardly across the inside of the downspout while the second portion may incline angularly downwardly outside the downspout and a second position wherein said first portion may extend substantially vertically inside the downspout while said second portion may extend substantially vertically downwardly outside the downspout, said second portion being formed so as to be concave upwardly to form a channel for water diverted by the diverter plate in the first position thereof, and means for detachably retaining said diverter plate in said second position.