1905 



FORESTRY AXL 



| 



the following headings printed at the 

 top of each 4 by 6-inch car 

 Locaiitv. Authority. Subject, Dal 

 ntial to know the author!: 

 in looking - series of n tes >n the 

 :e subject, they will almost invi- 

 riably contradict. Hence to proper! 

 weigh them one must know whether 

 a forest guard or a : ~ - " - e au- 

 thority. Photographs will prove e::- 





are one of die best means 

 g ;ma u s 



- " ~ 



- 

 en in the older count - 



ot tmheard of in fac: 

 t be said tha: forestr 



r cor- 



THE EFFECT OF FOREST COVER 

 UPON STREAM FLOW 



PART I. 



GENERAL FACTORS GOVERNING STREAM FLO\V 



BY 



\V. B GREELEY 



T X the current d:- iss : the re- 



lation of : rests : >:---.- - 

 ther i danger :: jverestimating 



the influence ::" forest cover upon the 

 character of a stream to the :-n 



of other factors of equal or gr-. -:-.-. -- 



ground to an a 



, but 



i - 



:e 



- 



that the wooded or denuded condition 

 of a watershed is of ne: : the con- 

 troUing factor in determining the be- 

 havior of the ?:reim: tha: a : reste ! 

 stream is necessarily regular in flow 

 and a deforested stream necessarl! ir- 

 'T^rolar. In any discasskxi :: this >_:b- 

 ject. it must be recognized at the or.:- 

 set that forest : - ; but one : a 

 number of far-reaching factors whc~ 



bined influence producer :-. f:ream 

 of a given character : and great care 

 must be taken not to attr: : : 

 presence or absence cf forest : - 

 upon a drainage basin refv.!:? :ch 

 may be due primarily to other causes 

 v there are two elements which 

 enter into the flow of every stream: 



" Surface run-off, or the water 

 which on account of th-. - ness 

 the slope?, the impermeable charsc:er 

 of the surface, or the saturated condi- 

 tion of the soil, does not ?:nk into the 







~ - ri. ::!; :~ the 

 reaches the stream almos 

 after precipitation. 



_ r~ -.r 



.: -.- r which on account 

 ..:T - ' - : :hr :is:r 

 character of ks sur: ., . - 



- '- r ^ exposed soil or ve 

 is able : : into the 



gre -.:er or less depth ins 

 ingatoccr jrer its surfac 

 :er may remain in the soi 

 ing gradually into the c 

 -:ream. Or it may penetrate through 

 the upper, permeable layers c: i 

 : reding springs and :her 

 ground 5 ounces :: stream so In 



either -~ hich becomes 



:r-c~ r : -TrTi^e --:. - 

 - - : :! ^r^ius 



rrer. ?even! : - :; ;-e: 



.:ion upon the basin. 

 The r" : ever stream is made 



up in par: : surface run-off, in part 

 of underground seepa^: 

 ^->und seepag t is c - , 



the permar. - . - of a 



stream - ' - 



changeable supply. As the proport 



