Figure 4. Vertical Cross Sections of Some Existing Roads; (a) – (c) : Tarred Roads (Highways); (d) – (f) Earth (Rural) Roads – Schematic

From

The Mechanics of Civil –Works Induced Gully Erosion: Applications to Development of Preventive Measures in South Eastern Nigeria

Godwin I. Nwankwor, Ubong P. Udoka, Boniface C. Egboka, Alex I. Opara

Applied Ecology and Environmental Sciences. 2015, 3(2), 60-65 doi:10.12691/aees-3-2-5