The novel idea of water Cherenkov calorimeter made of water tanks as the next generation neutrino detector for ν factories and ν beams is investigated. A water tank prototype with a dimension of 1×1×13m 3 is constructed, its performance is studied and compared with a GEANT4 based Monte Carlo simulation. By using measured parameters of the water tank, including the light collection efficiency, attenuation length, angular dependent response etc, a detailed Monte Carlo simulation demonstrates that the detector performance is excellent for identifying neutrino charged current events while rejecting neutral current and wrong-flavor backgrounds.

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