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A measurement of the $^8$B solar neutrino flux has been made using a 69.2kt-day dataset acquired with the SNO+ detector during its water commissioningphase. At energies above 6 MeV the dataset is an extremely pure sample of solarneutrino elastic scattering events, owing primarily to the detector's deeplocation, allowing an accurate measurement with relatively little exposure. Inthat energy region the best fit background rate is $0.25^{+0.09}_{-0.07}$events/kt-day, significantly lower than the measured solar neutrino event ratein that energy range, which is $1.03^{+0.13}_{-0.12}$ events/kt-day. Also usingdata below this threshold, down to 5 MeV, fits of the solar neutrino eventdirection yielded an observed flux of$2.53^{+0.31}_{-0.28}$(stat.)$^{+0.13}_{-0.10}$(syst.)$\times10^6$cm$^{-2}$s$^{-1}$, assuming no neutrino oscillations. This rate is consistentwith matter enhanced neutrino oscillations and measurements from otherexperiments.

Measurement of the $^8$B Solar Neutrino Flux in SNO+ with Very Low Backgrounds