Nomograph

• Nomograph is used to measure the erodibility factor of the soil.

100 K = 2.1 M^1.14 (10^-4) (12 - a) + 3.25 (b - 2) + 2.5 (c - 3)

where,

• M = the particle-size parameter,
• a = percent organic matter,
• b = the soil-structure code used in soil classification, and 
• c = the profile-permeability class.