. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 13.—Section showing relief-well method applied to the drainage of lands receiving water from a deep pervious stratum. coarse gravel. ReUef wells in gravel, however, develop so much water that it is necessary to excavate a pit and build in a lumber or concrete EiG. 14.—Section showing method of draining soils underlain by hardpan at a shallow depth by the use of relief weUs. Intercepting drain cuts off seepage carried on the top of the hardpan. DRAINAGE OF SOIL HAVING HARDPAN SUBSTRATUM. Another case in which
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 13.—Section showing relief-well method applied to the drainage of lands receiving water from a deep pervious stratum. coarse gravel. ReUef wells in gravel, however, develop so much water that it is necessary to excavate a pit and build in a lumber or concrete EiG. 14.—Section showing method of draining soils underlain by hardpan at a shallow depth by the use of relief weUs. Intercepting drain cuts off seepage carried on the top of the hardpan. DRAINAGE OF SOIL HAVING HARDPAN SUBSTRATUM. Another case in which rehef wells may contribute toward efficiency is shown in figure 14. In this case, which is frequently met with, a stratum of hardpan is found at a shallow depth, this being underlain. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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