  Galactic diffuse emission has provided us with evidence for cosmic ray
acceleration throughout the Galaxy and the background for searches for physics
beyond the Standard Model. However, only the very limited measurements of the
diffuse flux are available in TeV $\gamma$ rays. The High Altitude Water
Cherenkov (HAWC) Observatory is well-suited for observing the diffuse emission
of very high energy with its unbiased, wide field of view (2 sr). Using data
from HAWC, we present techniques for measuring the diffuse flux and show
preliminary results.
