GEOG 201 Study Guide - Midterm Guide: Gully, Point Bar, Rill

• School: University of Maryland
• Department: Geographical Sciences
• Course: GEOG 201
• Professor: Keith Yearwood

Document Summary

Define overland flow and know the different types of overland flow. Overland flow- water that flows over land but not in streams. Water moves under the force of gravity. Sheet flow- continuous flow of water over smooth surfaces. Flow in rivulets water that flows in tiny grooves in the land and this flow may not be continuous. Subsurface flow water that flows beneath the matted vegetation. Eventually ends up flowing into a stream. Know the factors that increase and decrease overland flow. More vegetation loosens soil and allows for more infiltration. If soil is compacted, clay or rock less infiltration. Define rill, gully, and sheet erosion and know the factors that cause those to occur. Occurs on steeper slopes and this is evident from the grooves in the land caused by the action of water. Many tiny channels in the land are sources and these channels are sometimes provided by row ploughing or row planting.