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As we descended from the ranges I observed that all the water I had seen glittering on the plains had disappeared; I found too that the larger water-hole in the glen had rather fallen than increased during the rains. The fact however was, that the under-drainage had not yet reached the lower part of the gully. We were now about 24 miles from the second creek Mr.
On those soils which must be tilled, even where they tend to wash away, the aim should be to keep the detritus open to such a depth that it may take in as much as possible of the rainfall, yielding the water to the streams through the springs. This end can generally be accomplished by deep ploughing; it can, in almost all cases, be attained by under-drainage.
As a result, there would soon be an extension of the improvement over the more important highways into the country; where a well-metalled width of twelve feet would accommodate nearly the whole traffic, and where the proper application of a cheap system of under-drainage would make well-metalled roads extremely cheap to maintain.
Where such natural drainage is secured, no artificial under-drainage will be needed. In many more instances, all that will be required in the way of draining will be to lead away the sources of wet-weather springs, which break through the road-bed and cause deep sloughs.
A New Englander, favorably impressed with the process, would be likely to answer these questions by another, and ask, will drainage pay? Not in one year, assuredly, nor in five; not in ten, perhaps. The British Government assumes that all the expenditure upon under-drainage will be paid back in fifteen or twenty years at the farthest.
No intelligent English farmer, who has tried the system, now asks if under-drainage will pay; nor does he expect that it will pay back the whole expenditure in less than twelve or fifteen years. Here is a generous faith in the operation on the side of all the parties concerned. Then why should not Alderman Mechi's irrigation system be put on the same footing, in the matter of public confidence?
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