63 



At the beginning of the rainy season, in early December, the 

 soil on all four of these basins was very dry as a result of the long 

 dry season. The accumulation of litter, duff, humus, and soil on 

 the forest-covered catchment areas absorbed 95 per cent, of the un- 

 usually large precipitation. On the nonforested area only 60 per 

 cent, of the precipitation was absorbed, although the rainfall was 

 much less. 



Rainfall a7id run-off during January, February, and March, 1900. 



The most striking feature of this table as compared with the 

 previous one is the uniformly large run-off as compared with the 

 rainfall. This clearly shows the enormous amount of water taken 

 up by a dry soil, either forested or nonforested, as compared with 

 one already nearly filled to saturation. During the three months 

 here noted, on the forested basins about three-eights of the rain- 

 fall appeared in the run off, while on the nonforested area nine- 

 teen-twentieths appeared in the run off. 



Rapidity of decrease in run-off after the close of the rainy season. 



Area of 



catchment 



basin. 



Sq. miles, 



0.70 



1 05 



1.47 



..53 



Condition as 

 to cover. 



Forested 



do. 



d... 

 Nonforested 



Precipiia- 



tioii. 



April 

 run -off per 

 &q. mile. 



Inches. 

 1.6 

 1.6 

 1.6 

 1 



Aci e — feet. 

 153- 

 146- 

 166 

 56 



Mny 



run-off per 



sq. mile. 



Acre — feet. 

 66- 

 70 



74 

 2- 



June 



run-off 



.=q. mile. 



Acre — feet, 

 25- 

 30- 

 30 

 



