THE DEVELOPMENT OF MODELS FOR PREDICTION OF GULLY GROWTH AND HEAD ADVANCEMENT(A Case Study: Queen Ede Gully Erosion Site, Benin City, Edo State, Nigeria)

This paper examines gully growth and head advancement at Queen Ede gully Site Benin City.This is achieved by observing gully growth and head advancement between the year 2000 and 2012 using field surveys, aerial photographs and geographical information system. Also by using experimental models such as Thompson [1], American Soil Conversation Service, SCS (I), SCS (II) and FAO models, for estimating migrating headcuts over a study period. Results obtained, revealed that the gully width varied from 15.6m to 99.5m while the depth varied from 0.5m to 13.8m. The volume of soil loss was 372, 775m3 over an area of 104.4m2.