Review of Efforts to Combat Desertification and Arrest and Reverse Land Degradation in Myanmar - Combating Desertification in Asia, Africa and the Middle East - page 278

Fig. 14.3 Severe gullying may require structural works to reduce flow and trap sediment

Fig. 14.4 Structural gully control works are an effective means for control of sediment movement

undercutting, flow along the gully and raindrop erosion, and is the process by
which the gully widens and deepens. As a gully extends upslope the catchment
area contributing to head erosion reduces, and uphill movement may eventually
stabilize. On the other hand, the rate and amount of over-edge inflow and sub-
surface inflow may increase concurrently, enhancing the side erosion process and
causing deepening or widening of the gully so long as its capacity to transport
eroded material downstream is not exceeded.