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7It will moreover be expedient, when the level of the fall from the spring is obtained, to build reservoirs at distances of twenty thousand feet from each other, because if damage be done to any part, it will not then be necessary to take the whole work to pieces, and the defective places will be more easily found. These reservoirs, however, are not to be made on a descent, nor on the venter, nor on a rise, nor, generally speaking, in valleys, but only on plains.
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