. Engineering and Contracting . .,.., B, « ^^ a. ^. 1 V s 1 x> §??<-?%• 1 Vj jlL- . v .^ s -^ s== The flow through the several drains was measured dailyduring their construction, and that through each drain wasfound to decrease gradually for two or three weeks after itscompletion, which indicated that the level of the ground-water was being slowly lowered. The total undergroundseepage after the drains had been in place sufficiently longto have reached their minimum of flow, and after defects inthe surface drainage had been corrected, amounted in thedriest weather to about 12,000 gal. per
. Engineering and Contracting . .,.., B, « ^^ a. ^. 1 V s 1 x> §??<-?%• 1 Vj jlL- . v .^ s -^ s== The flow through the several drains was measured dailyduring their construction, and that through each drain wasfound to decrease gradually for two or three weeks after itscompletion, which indicated that the level of the ground-water was being slowly lowered. The total undergroundseepage after the drains had been in place sufficiently longto have reached their minimum of flow, and after defects inthe surface drainage had been corrected, amounted in thedriest weather to about 12,000 gal. per day from an area ofabout 4 acres, 2 acres of which are covered by buildings thedrainage from which is otherwise disposed of. This was iiPcreased to about 100,000 gal. per day in very wet weather. Movement of the ground stopped promptly at one pointafter another as the drains at these respective points werecompleted, until the work was finished. After completion,not the least movement could be noticed at any time. The. Cross Section of Factory Site From Bluff to Mississippi River. cross-section as the box underground. Points at which thedrains came to the surface were selected, on steep slopes, soas to have the drain-pipe or box pass through as short lengthsas possible of the surface earth, as this was constarftly inmotion and tended to pull the sections of pipe and box open flumes were placed on timber bents spaced 10 or12 ft. apart. The flume was kept from disjointing at eachslight displacement of the bents due to movement of theearth. The bents could be put back in place after each move-ment without injuring the flume. After the completion of the under-drains the earth nearthem, especially on the hill sides, was graded to slope uni-formly toward the gravel-filled trenches through which thewater passed to the under-drains. Cross Section of Sliding Ground. earth, which formerly was muddy and soggy from one rainuntil the next, now dries rapidly after each successi
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