The term, runoff ratio, is the percent of drainage basin precipitation that becomes streamflow. The isoline map of runoff ratio is based on isoline maps of mean annual precipitation and runoff.

Different maps can show geographical data in different ways. Chloropleth maps use shades of colour to show variations in data over wide areas. Isoline maps join places that share a value. Dot maps can ...

Revise how to read and understand Ordnance Survey maps with this BBC Bitesize Scotland geography revision guide for Fourth Level in Scotland's CfE. Data shown on maps Different maps can show ...