by Mike Nomic » 09 Apr 2007, 15:25
The same applies to Bristol and the surrounding area (Avon!? - that disappeared donkey's years ago) as it does to anywhere else in the country or to anywhere else in the world come to that.
You start with maps (preferably large scale) looking for estuaries, rivers, streams, lakes, ponds, canals and other water features. Canals, you puzzle - well particularly in the areas where there are flights of locks, there are pounds at the top to hold the water that is needed to operate the locks: these are refilled by pumping from the stretch of canal (ever seen one that's not a thick brown colour full of sediment?) below the flight, hence large stationary areas of water, so mud is a fair bet.
Then try Yellow Pages, or your local classified directory in other parts of the world (or its online equivalent wherever you may be) looking for Granite & Slate Suppliers, Gravel Suppliers, Quarries, Quarrying & Mining Companies, Sand & Gravel Suppliers, and Stone & Marble Merchants. Now it's not rocket science to rule out those with urban addresses (offices and merchants) leaving those locations where extraction actually takes place.
Most quarrying operations (particularly sand and gravel) require washing of the material to remove the smaller than required elements (dust, grit, etc) and this residue is left to its own devices in settling ponds. These are large deep/very deep pools, generally of particularly sloppy material, although they may, depending on the nature of the operation, have their own strata built in. Where the drainage is good (which is not the norm), or the operation is sporadic, or there are various settling ponds in use, the discarded material builds up in layers which can dry out slightly on the top, until another layer is deposited. Sinking in to such a pond, one can frequently break through several of these layers, feeling an intermittent slight resistance as each layer is broken. Further layers can normally be broken with a little extra effort, taking care as not all layers are the same depth. Crotch/waist even bust-deep is not unusual in these ponds.
So there you go: the Severn (both sides) above, below and between the bridges; the lower reaches of the Wye; the Bristol Avon - especially the lower stretches (where some of the mostwam sets are shot), and probably more quarries, etc than you can wave a stick at.
Go seek, and let us all know what you find.
Mike Nomic
Normality is subjective!