Geomorphology- Drainage basins in South Africa

Lesson content: • Concepts of - Drainage basin - Catchment area - River system - Tributary - Confluence - Watershed - Interfluve - Source - River mouth - Surface run-off - Groundwater - Water table • Types of rivers - Permanent - Periodic - Episodic - Exotic • Underlying rock structure, development and characteristics of the following drainage patterns: - Dendritic - Trellis - Rectangular - Radial - Centripetal - Deranged - Parallel • Definition and factors influencing drainage density - Precipitation - Evaporation - Soil moisture - Vegetation - Slope/gradient - Porosity - Permeability • Determining stream order • Use of topographic maps to determine drainage patterns, drainage density and stream order • Discharge of a river - Laminar flow - Turbulent flow