Fig. 2From: Calibrating and validating a combined accumulation and mobilisation model for water distribution system discolouration using particle swarm optimisationA mobilisation model where all shear strengths erode simultaneously at a rate that is constant with time for each shear strength but varies between shear strengths, with the weaker material eroding more quickly as driving force (Ï„a-Ï„) is greaterBack to article page