28 BULLETIN 835, U. S. DEPARTMENT OF AGRICULTURE. 



Table 15. — Distribution of moisture in horizontal flumes. 



FLUME 20. 



Date. 



Dis- 

 tance. 



Top 5 



inches. 



"Bottom 

 5 inches. 



Average. 





Inches. 



Per cent. 



Per cent. 



Per cent. 



Apr. 18.. 



3 



25.72 



23.04 



24.38 





9 



20.21 



21.45 



20. 85 





21 



19. SO 



21.82 



20.81 





45 



17.00 



19.44 



IS. 22 





69 



15.74 



17.66 



16.70 





SI 



12.00 



' 16.47 



14.24 





93 



13.34 



15.03 



14.18 





105 



11.52 



13.21 



12.36 





111 



10.30 



10.78 



10. 54 





117 



S.36 



6.76 



7.56 



FLUME 31. 



Apr. 20.. 



9 



21.29 



22.96 



22.12 





15 



20.42 



21.66 



21.04 





21 



18. 99 



20.00 



19. 50 



Apr. 29.. 



9 



23.02 



25. 49 



23.75 





15 



23.02 



24. 52 



22.39 





27 



21.82 



22.96 



22.39 





33 



18. 98 



21.84 



20.41 



May 23. . 



9 



23.66 



25. 07 



24.36 





33 



20.39 



22.76 



21.57 





51 



18.45 



20.18 



19.31 





59 



16.43 



17.76 



17.09 



June 10 . 



9 



23.72 



21.98 



22.85 





22 



22. 55 



23.65 



23.10 





34 



19.77 



22.74 



21. 25 





52 



IS. 35 



20. 64 



19.50 





64 



13. SI 



17.88 



15. S5 



FLUME 50. 



Sept. 21 . 



3 



43.31 



45.86 





12 



44.50 



42.52 





24 



39.16 



41.82 





30 



38. 92 



39.94 





33 



35.65 



37.01 



44.58 

 43.61 

 40.49 

 39.43 

 36.33 



FLUME 70. 



Date. 



Dis- 

 tance. 



Top 5 



inches. 



Bottom 

 5 inches. 



Average. 



Oct. 14.. 



Inches. Percent 

 3 13. NO 

 30 4. 59 



Per cent. 

 14.60 

 9.62 



Per cent. 

 14.20 

 7.10 



FLUME 90. 



Jan. 29 . 



Feb. 22. 



Mar. 5. 



Mar. 10. 



Apr. 7. 



1 



28. 80 



28. 81 



18 



26.37 



26.66 



42 



19.30 



20.07 



* 



30. 53 



29. 15 



18 



28.44 



27. 87 



42 



25.44 



25. 04 



72 



18. 81 



19. 75 



i 



32. 30 



29. S3 



9 



30.22 



27. 49 



18 



28. 35 



26. 17 



30 



26.76 



26. 05 



42 



25. s6 



25. 27 



54 



25.35 



25. 58 



72 



17. 65 



23. 33 



84 



22.35 



22. 80 



96 



18.53 



19.87 



J 



31.53 



29. 52 



IS 



27.44 



26. 30 



42 



26.33 



25. 66 



72 



23.37 



23. 67 



37J 



26.50 



26.00 



1 



FLUME 200. 



28. SO 



26.52 

 19.69 



29. S4 

 28. 15 

 25.24 

 19.28 

 31.07 

 28. 85 

 27.21 

 26.40 

 25. 57 

 25. 47 

 20.49 

 22. 57 

 19.20 

 30.52 

 26. 87 

 25.99 

 23. 52 

 26.25 



3 



11.92 



16.28 



14.10 



4 



12.50 



18. 25 



15.37 



28 



10 37 



11.95 



11.34 



46 



14.61 



16.71 



15.66 



64 



9.59 



13.00 



11.30 



End. 



4.43 



5.02 



4.72 



In flume 90 the same conditions are found as in flume 31, except 

 that during the months of January and February there is an appar- 

 ent discrepancy in the percentages of moisture in the bottom 5 inches 

 and the top 5 inches of soil. This apparent discrepancy is probably 

 the result of temperatures below the freezing point and will be 

 considered in a subsequent part of this report in connection with 

 other similar analyses. 



All of the flumes show a gradual decrease in the percentage of 

 moisture from the tank end of the flume to the outward extremity 

 of the wetted area. In flume 20, the average percentage of moisture 

 decreases .at the rate of approximately 1.75 per cent for each linear 

 foot between the third and eleventh feet. In flume 50 the rate of 

 decrease is about 2.2 per cent per linear foot. The rate of decrease 

 varies in these flumes, as would be expected not only from the dif- 

 ferent meteorological conditions when the experiments were run, but 

 also from the character of the soil. 



