# sinu

Channel sinuosity is a measure of how much a river or stream channel deviates from a straight line between two points. It is calculated by dividing the length of the channel by the straight-line distance between its endpoints. 

For rivers, the conventional classes of sinuosity are:

| Sinuosity       | Channel Form    |
| --------------- | --------------- |
| < 1.05          | almost straight |
| ≥ 1.05 - < 1.25 | winding         |
| ≥ 1.25 - < 1.50 | twisty          |
| ≥ 1.50          | meandering      |