 | Joseph Alexander Jeffery - 1916 - 296 頁
...remove the water and therefore the larger must be the tile. Elliott says : " If we double the grade per hundred feet of the drain we increase its carrying capacity about one-third." If this be true, then if we lower the grade by half we should decrease the carrying capacity by one-fourth.... | |
 | Michigan. State Board of Agriculture - 1912 - 616 頁
...the water, and therefore the larger must be the tile used. Elliott says : "If we double the grade per hundred feet of the drain we increase its carrying capacity about one-third." If this be true, then if we lower the grade by half we should decrease the carrying capacity by one-fourth.... | |
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If we double the grade per hundred feet of the drain we increase its carrying capacity about one-third." If this be true, then if we lower the grade by half we should decrease the carrying capacity by one-fourth. 