  The Water Cherenkov Detector Array (WCDA) is a major component of the Large
High Altitude Air Shower Array Observatory (LHAASO), a new generation
cosmic-ray experiment with unprecedented sensitivity, currently under
construction. The WCDA is aimed at the study of TeV $\gamma$-rays. In order to
evaluate the prospects of searching for TeV $\gamma$-ray sources with the WCDA,
we present in this paper a projection for the one-year sensitivity of the WCDA
to TeV $\gamma$-ray sources from TeVCat (footnote: http://tevcat.uchicago.edu)
using an all-sky approach. Out of 128 TeVCat sources observable to the WCDA up
to a zenith angle of $45^\circ$, we estimate that 42 would be detectable for
one year of observations at a median energy of 1 TeV. Most of them are Galactic
sources, and the extragalactic sources are Active Galactic Nuclei (AGN).
