  We present a time-resolved spectrophotometric study of the optical
variability in the quiescent soft X-ray transient A0620-00. Superimposed on the
double-humped continuum lightcurve are the well known flare events which last
tens of minutes. Some of the flare events that appear in the continuum
lightcurve are also present in the emission line lightcurves. From the Balmer
line flux and variations, we find that the persistent emission is optically
thin. During the flare event at phase 1.15 the Balmer decrement dropped
suggesting either a significant increase in temperature or that the flares are
more optically thick than the continuum. The data suggests that there are two
HI emitting regions, the accretion disc and the accretion stream/disc region,
with different Balmer decrements. The orbital modulation of H$\alpha$ with the
continuum suggests that the steeper decrement is most likely associated with
the stream/disc impact region. We construct Doppler images of the H$\alpha$ and
H$\beta$ emission lines. Apart from showing enhanced blurred emission at the
region where the stream impacts the accretion disc, the maps also show
significant extended structure from the opposite side of the disc. The trailed
spectra show characteristic S-wave features that can be interpreted in the
context of an eccentric accretion disc (abridged).
