This tapered geometry allows the simultaneous investigation of clogging by both sieving and bridging mechanisms, which occurs independently across the parallel channels. Single particle clogs are formed downstream of the channels and towards the outlet while clogs formed by bridging or adhesion are located upstream and held in position by force chains. However, above a critical threshold, flow driving pressure overcomes force chains that would otherwise hold a bridged clog in place. Such behavior has been extensively reported in the flow and clogging of granular materials . The magnitude of force chains is well characterized in diverse granular flow systems and their stability is known to determine the strength of a clog .