A population balance equation that governs the floe size distribution in turbulent flow, incorporating both the splitting and erosion mechanisms of tloc breakage has been presented in previous studies[6,7]. Experiments have been conducted in which transient floe size distributions of dilute suspensions of Kaolin-hydrous ferric-oxide floes undergoing breakage in agitated batch system are obtained over turbulent microscale shear rates ranging from 60 to 400 se-'. Floe size distributions over a range of flat diamctcrs from about 1 to 100 wrn are measured by overlapping tcchniqucs, including computerized optical scanning of photographs and rapid electronic sizing of individual Rots using a light blockage transducer. The experimentally determined size distributions are then fit to those computed from the population balance equation, using constrained nonlinear least squares. The splitting frequency of parent tlocs is found to vary as the 0.33 power of the parent floe volume and 0.71 power of the shear rate. The average number of daughter fragments produced upon splitting of individual floes is found to be about 2.5. The mean and standard daviation of lhe daughter fragments produced upon splilling are found lo be in fined ratio to one another, independent of the parent Aoc size and shear rate. An appropriarely nondimensionalized coefficient characterizing floe erosion has been found to be independent of shear rate.