Abstract: Apparatus and method utilize an open-top hopper having an upper cascade-zone and a lower pool-zone. Crude snow-debris is intermittently dumped into the hopper open-top and there operationally admixed with low-temperature water; this admixture is converted by cascade-zone comminution drums into a rough-slurry that pools at the pool-zone. Within the pool-zone, the rough-slurry is agitated, preferably with a revolvable bladed shaft, into a smoothly flowable-slurry that is dischargeable through an apparatus outlet to a remote disposal site which might be a municipal sewerline. Preferably, the apparatus takes the form of a wheeled vehicle, has a lengthily agitated pool-zone extending beyond the hopper, and is equippable with other desireable optional structural features.