HYDROLOGY OF NEW YORK 



131 



On comparing these two streams, as per the foregoing tabula- 

 tion, it appears that the water yields are quite different. In 

 searching for a reason for the difference which appears, the 

 writer assigns as a principal cause the difference in forestation, 

 the Hudson area being still largely in forest, while the Genesee 

 is almost totally deforested and under cultivation, either for grain 

 farming or gracing. 



By way of still better comparing the rainfall, runoff and 

 evaporation of these two catchment areas the following tabulation 

 has been prepared : 



Comparison of rainfalls, Hudson and genesee rivers 



Rainfall Rainfall 

 of Hudson of Genesee 

 Year area area Difference 



1890 50.35 47.54 +2.81 



1891 42.96 38.12 +4.84 



1892 53.87 41. G9 +12.18 



1893 42.18 39.30 +2.88 



1894 41.37 47.79 —6.42 



1895 36.67 31.00 +5.67 



1896 45.21 40.68 +4.53 



1897 46.51 34.39 +12.12 



1898 48.30 42.50 +5.80 



Mean 45.27 40.33 +4.94 



Comparison of runoffs, Hudson and genesee rivers 



Runoff Runoff 



v of Hudson of Genesee 



xear area area Difference 



1890 28.56 21.22 +7.34 



1891 20.56 14.05 +6.51 



1892 33.08 15.42 +17.66 



1893 21.91 13.35 +8.56 



1894 19.37 19.38 —0.01 



1895 17.46 6.67 +10.79 



1896 23.63 12.80 +10.83 



1897 26.19 9.38 +16.81 



1898 •••• 27.65 15.13 +12.52 



Mean 9A 9.7 14 i« ,m -m 



