Читать книгу The Rivers and Streams of England - Bradley Arthur Granville - Страница 4

PARTICULAR distinction may be fairly ascribed to what is commonly known as the Chalk Streams. There are not many of them in the world, and nearly all of them are in England, being even here the possession of but a few counties. For Wilts, Hants, Dorset, and Berks, with Bucks, Kent, and Herts in a less degree, contain practically all the rivers of this type, and of these the two first-mentioned are more exclusively the home of the chalk stream. Wiltshire gives birth to the Kennet, the Christchurch or Salisbury, Avon, and the Wiley – all notable rivers of this class; the upper part of the first, most of the second, and the whole of the third being within the county, while Hampshire has the Itchen and the Test, of the same class and rank. The quality of the chalk stream lies in its exceeding clarity. The water filtering through the great masses of dry chalk upland, where it meets the clay or greensand on which they lie, breaks out of the base of the hills as pellucid in texture as the springs that rise in the limestone countries of the north and west, and form their more rocky streams. In the valleys of the chalk counties, too, the beds of the rivers are apt to wash out hard and clean, and set off to great advantage the crystal currents that glide or ripple over them.

They combine the clearness of a mountain stream with only a degree more current than the slow-running rivers of central or eastern England. They savour, in short, of the unexpected. There is no stir nor movement of water on the hillsides, as in Wales or Devonshire, to suggest the natural corollary of a clear torrent in the valley below. The hills here, though graceful and delightful in their peculiar way, are more waterless than any clay ridge in Northamptonshire or Suffolk, for reasons already given. Nor does the chalk stream usually run like a western river. It moves at most times but little faster than the rivers on which men go boating or float-fishing for roach. Its environment is smooth, its course is peaceful, and its fall gradual. It is all this that gives the flavour and charm of the unexpected, when you arrive at the bank and find a stream gliding past your feet as translucent as if it had just gushed out from a limestone mountain in Cumberland.

The Chalk Stream gives best evidence of its quality in being the natural home of the trout and grayling, fish that do not often flourish in, and are never indigenous to, slow-running streams of other than chalk origin. There are two Avons in Wiltshire which illustrate the contrast to perfection: the one which runs westward through the fat pastoral regions, the clays and greensands of north-west Wilts towards Bath and Bristol; the other, which rises in the Marlborough Downs, and cuts through the heart of Salisbury Plain, as translucent as a mountain stream. The last alive with lusty trout; the other, which moves slowly with murkier current over a muddier bottom, breeding only coarser fish and belonging to another family of rivers.