18 



BULLETIN 181^ U. S. DEPAETMENT OF AGEICULTUKE. 



(7) The probable maximum rate of run-off as determined from a 

 hydrograph constructed according to (3) and (6). 



The time required for the Pearl River to rise is shown by the line 

 a & in figure 4, A and B, and was about six days in each case. It 







J9S9 J/l-t' ,,9/^9 Ji^ZP JOy9lVloI\ 



3 



OS 



cue 



09 



3 



>s 

 o° 



'^^ 



3 

 ere 



3^ 

 <e 



>>S 

 ->l 



(Do 



—)~ 

 s 



(OS 



Se 



S-S 



<5 



i-S 



5i 



cs 



K5- 











> 

















J 







































J 













«^ 









*io 







A 



't~~ 







_^ 





"O 





J 



_j 





'o 











"o 







T 















;> 







in 











<D 







•■ 





CO 







■" 





04 







■ 





o 







-~1 





















m 





-* 



H 





<n 





~S 



S| 





o 





•a 



^ 





in 





^ 







m 





^ 



M 





































■ 





— 











— 













































































































. 











— 





















m 





















•<s 











o 





^ 





o 







1 





in 











=_ 







^ 





















o 











CO 







in 







• 





in 











^ 





























_ 







Li 













CO 





_= 







i 





, 



_= 







J^ 



1 











_i 



















— 



— 





— 



— 



' — 





— 













' — 



.^ 



— 



— 





— 



-~ 



— 





— 



— 













-- 























































































■ 











"in 











CO 











■CO 









■'o 



























o 











uO 







. 





r- 







, 





en 











CO 







. 





















— 











o 











o 











r-j 











o 









































■ 











. 





















i 

























































































































































-<3-> 











'(XI 







"— 





"t 







~ 





■CO 











=00 







- 

















/ 





1— 











CO 











CO 







— 





't 











CiJ 





















1 





O 











— 











— ; 











o 











cs 



















Co 



1 





















• 











* 



































I 

















































. 













^, 



/ 











•! 





















- 







































■■^ 







. 





"00 











'r~ 







. 





■— 











-in 







— 











— 



— Q- 



S- 



— 



_i 





— 



;;^ 





o 





— 





— 



CD 





— 



^-i 



— 



c-J 



— 



— 



■s 





CO 







^ 











— 



^co-J 



^ 



— 







— 











— 





— 



— 





— 1 



r^ 



— 





— 



— 













' " 













^^ 



^ 





















' 









1 . . 





















__ 













^^ 























"■1 











' 





















" 













-^ ( 







'r- 





_^ 







-"rj 











'lO 











■in 











•^ 





. 



_B 















\ 





o 











— 











o 







■ 





— 











cC 







■ 



S 











) 





lO 











IT) 







■J 





CD 







j: 





'J- 











CO 





' 



" 









''; 













•{ 











__ 











__ 





















^ 











\ 





















— 









— 



-- 































k 





















■ 





























. 















'— 





■ 







*CO 





' 



"w= 





=cn 







^ 





't- 



. 



jI 





-o 







■1 















tn 











O 







^ 





CO 





■^ 



■^ 





_ 











CO 



















It 







in 











CO 











■+ 











in 











'^ 





































































■ 



































■ 











• 

































; ^ 























i 









- 



— 





















' 













ul 







-'CO 











*tSJ 











'[~ 











"^ 











'•+ 



















I. 



/ 





rO 











Cvl 











o 







. 





CO 









c^ 







' 















/ 







[~g 











a 











c-J 





1 





d 









c^ 







- 















X 





























































<^ 

































1 



















— 













> 























" 



' _ 











— 

























/ 



— ' 











■lO 











CO 











\r, 







■ 





■^ 











•o 















( 













to 





" 







iT) 





^ 



-^ 





C51 





- 



^— 





CO 





r"~ 



■«■ 





r- 







^~ 











V, 











m 











O 











K 











o 











CO 







— 













""— 





N^ 















— 





— 



r— 









1— 



L— 





— 1 



- 













—" 

















1 















— 







"■ 











^ 





1 































1 































■ 





















: 

















1 





'CO 











Tn 











'.^ 







"^ 





=<n 











"^ 







■ 

















j 





CO 











CO 







' 





(N 







" 





r- 











— 







" 

















/ 





_ 







. 





<S 







. 















M 











(NJ 























I 

































































/ 



' 

































































/ 

































^ 









^_ 

























/ 









-■_ 











"CD 







. 





-"ir> 











-<vl 











■cO 



















V 









1^ 











<3-> 







^ 





en 







-* 





— 











C) 





















^ 







in 











OJ 







- 





(vj 







J 





CS 











'^ 







_!a 

















> 









^^ 













^^ 































« 





































- 











— 





















■ 

















1 



































































) 





=_ 











'o 





— 



^ 





CO 







— ^ 





'<r> 

















"* 













^ 



--' 







cs 











IS 











(NJ 











CO 











^ 















<:- 











CS 











irj 











in 











in 











in 















,' 

























































' 











_ 



—i 





















. 











^ 





















_^ 





sj ";^ h '^ « 5 «) 



V}. "to ki V '■<- Vr) ki '^ V 'O fNJ V Vj. V) N k S- "> "^ '-^ 



oyi9niDso}i 7000 ON g N09>i0vp iii/-ixon(] aiiqoozv/^ 



would be impossible to predict precisely the effect of improved drain- 

 age conditions upon this interval of time, but owing to the increased 

 velocity of flow in the channel a less time would be expected, and in 

 the computations this time will be taken as five days. 



