Central angle (deg.)

Shape of river

Undifined or zero

Straight

0 < α ≤ 41

Semi Meander

41 < α ≤ 85

Undeveloped meande

85 < α ≤ 158

Developed meander

158 < α ≤ 296

More developed meander like river

Up to 296

River ox-bow (serpentine arc)