I I I I I I I 1 I I I I I I I I l_l I I L_l l_j — I — I — I — \ — lJ 



5 10 15 20 25 30 



TIME (Minutes) 



Figure 2. — Infiltration into bare water-repellent soils. 



Curve 7 is from a plot having a continuous subsurface water-repellent layer (Pat- 

 tern 7). The initially high infiltration is due to the absorbent surface soil. Once 

 the soil above the water-repellent layer was thoroughly wetted, infiltration did not 

 cease entirely--as might be expected--because of lateral flow in the surface soil, 

 but also because of slow penetration into the repellent layer. ^ 



Gz-ouxxd Co'vez* Effects 



The selection of the number of plots on each ground cover type was based on frequency 

 of occurrence of the cover types, and on variations in infiltration within the' cover 

 type. Cover types that had the most widely varying infiltration rates were sampled 

 more intensively. The number of plots is too small to allow valid statistical tests 



9 



