There is a growing interest in very long baseline neutrino oscillation experimentation using an accelerator produced neutrino beam as a machinery to probe the last three unmeasured neutrino oscillation parameters: the mixing angle ${\theta }_{13}$, the possible $CP$ violating phase ${\delta }_{CP}$ and the mass hierarchy, namely, the sign of $\Delta m_{32}^2$. Water Cherenkov detectors such as IMB, Kamiokande and Super-Kamiokande have shown to be very successful at detecting neutrino interactions. Scaling up this technology may continue to provide the required performance for the next generation of experiments. This report presents the latest effort to demonstrate that a next generation ($>100\mathrm{kton}$) water Cherenkov detector can be used effectively for the rather difficult task of detecting ${\nu }_e$s from the neutrino oscillation ${\nu }_{\mu }\to {\nu }_e$ despite the large expected potential background resulting from ${\pi }^0$s produced via neutral current interactions.

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