of the land. There are three different main types, which are affected by the rocks and ground underneath. Rock that is quick to erode forms dendritic patterns, and these are seen most often. The two other types of patterns that form are trellis patterns and rectangular patterns.

Rain gauge data is used to measure total precipitation over a drainage basin, and there are different ways to interpret that data. In the unlikely event that the gauges are many and evenly distributed over an area