Measurement of High Energy $\nu_{e}$ in the T2K beam using ND280 P0D

The T2K experiment is a long baseline neutrino experiment designed to directly measure $\nu_{\mu } \longrightarrow \nu_{e}$ oscillation, thereby provide a measurement of the neutrino mixing angle $\theta _{\mathrm{13}}$. A firm understanding of the $\nu_{e}$ intrinsic to T2K's predominantly $\nu_{\mu }$ beam is vital for an accurate $\nu _{e}$ appearance measurement. To this end, the $\pi^{\mathrm{0}}$ detector (P0D) in T2K off-axis near detector (ND280) measured the high energy part ($\ge $1.5 GeV) of the $\nu_{e}$ contamination, which is predominantly from Kaon decays during beam production, and compared this to the prediction used for T2K's latest oscillation results. We present the details of this analysis, including the selection criteria and systematic errors considered, as well as the use of this measurement to confirm the $\nu_{e}$ flux prediction. In addition, we will discuss about preliminary on-water analysis of $\nu_{e}~$interactions, using P0D.