Thursday, August 20, 2009
More mud morphology.
The islands that make up the City of Richmond are flat, boggy silt pans that at most rise a few feet above sea level. The arms of the Fraser that reach among them built and could potentially diminish them. High water levels are a problem--tidal, and seasonal increases in river level, the spring freshets from inland snowmelt. Thus the city has a complex system of ditches and storm drains, and is surrounded by a dyke. Spaced along the dyke are small brick pump houses that keep the storm water flowing outward. At these outflow points, deep, irregular channels are sculpted into the tidal mudflats, and are visible at low tide.
Rising sea levels a problem for Richmond? Shhh! One sticks one's head in the sand, er, mud.