Drainage features 1rivers2 on Ordnance Survey maps

Apuntes

• Subtopic: Introduction to Drainage Features on Ordnance Survey Maps In this section, you will learn how river features and drainage features can be identified on an Ordnance Survey map. • Subtopic: Understanding Drainage The word "drainage" refers to how water flows in an area. On an Ordnance Survey map, you can identify rivers, streams, and other drainage features present in the landscape. If an area is well-drained, it will attract settlement. Conversely, a poorly drained area might have a chaotic system of rivers and streams, bogs, or marshland, and therefore little settlement. • Subtopic: Patterns of Drainage We can identify different patterns of drainage using Ordnance Survey maps. The most distinctive patterns of drainage are dendritic, trellis, radial, and deranged. **Dendritic** Dendritic drainage systems are the most common form of drainage system. In a dendritic system, many tributary streams combine before joining the main river. **Trellis** As a river flows along, smaller tributaries feed into it from the steep slopes on the sides of mountains. These tributaries enter the main river at an angle close to 90° (right angle), creating a drainage system that looks...