Figure 6. Aerial photograph of Racine Island taken 16 August 1995 showing remnant channel
surrounded by overbank deposits.
tween Bread Truck Pond and C-Pond, were ad-
areas (Fig 5). Headwalls and adjacent lateral
vancing at a mean rate during 19931994 that was
walls receded at variable rates: 0.1 to 4.9 m dur-
sufficient to cause increased drainage of these
ing summer 1992, 0.4 to 6.3 m during winter 1992
ponds in 15 to 20 years (Lawson et al. 1996).
93, 0.0 to 9.8 m during summer 1993, 0.0 to 2.3 m
Surveying of longitudinal profiles of tidal gully
in winter 199394, and 0.0 to 2.6 m in summer
thalwegs revealed nonuniform gradients that re-
1994. Large tidal floods in 1993 and 1994 caused
flect their progressive and episodic elongation into
the highest headwall recession rates. Two gully
the mudflats and ponds, and a lack of equilib-
headwalls, one on the western side of Bread Truck
rium with present conditions. Gully gradients are
Pond and the other near the pond complex be-
8
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