ABSTRACT
Gully control structures are installed across active gullies to stabilize them by controlling erosion. The rate of gully erosion is predominantly dependent on the runoff-producing features such as drainage area, soil characteristics, shape, size and alignment of gully, and the slope of the watershed channel. Vegetative cover protects the gully against scouring by reducing the flow velocity of water through an increase in hydraulic resistance of the channel section. Vegetation is considered as the foremost, long-term defence for controlling gully erosion. A discontinuous gully is also termed as an independent gully and can develop on hillsides after land sliding. A continuous gully has a main gully channel and is comprised of several mature or immature branch gullies and many branch gullies. The rate of gully erosion is predominantly dependent on the runoff-producing features such as drainage area, soil characteristics, shape, size and alignment of gully, and the slope of the watershed channel.
