ENGINEERING CONSTRUCTION AND RAINFALL. 



XXXV. 



Many formulae have been proposed from time to time to enable 

 an engineer to deal intelligently with this subject, but no 

 absolutely certain general rule has been, or, indeed, can be laid 

 down on this point. 



Appended is a list of various formula? proposed for determin- 

 ing the discharge from any given area.* 





CQ 





















Sh 



^4 



CO 



















© 



> 



* 



O 



















CD 



« 



CI 



o 











>» 









3 



'CD 

 g 



'3 

 a 



o 





a 



o3 





s 

 g 

 © 



to 



5-1 



O 



pq 



o 

 O 



o 

 Q 





o 



H3 



<1 



<3 



O 



S 





Acres. 







Discharge in 



Cubic Feel 



per Seconc 



I. 







5 



7 



22 



25 



3 



17 



7 



5 



9 



22 



22 



4 



16 



10 



12 



36 



41 



6 



30 



11 



9 



15 



32 



32 



7 



28 



15 



16 



49 



53 



9 



40 



16 



11 



20 



39 



39 



10 



38 



20 



20 



61 



67 



11 



50 



20 



17 



25 



45 



45 



12 



47 



30 



27 



82 



85 



17 



68 



27 



22 



34 



55 



55 



16 



63 



40 



34 



103 



102 



20 



84 



34 



28 



42 



63 



63 



20 



78 



50 



40 



121 



119 



24 



99 



41 



33 



48 



71 



71 



24 



93 



60 



45 



139 



134 



28 



114 



48 



39 



54 



77 



77 



27 



106 



70 



51 



156 



149 



32 



128 



54 



45 



61 



84 



84 



31 



119 



80 



56 



173 



162 



35 



141 



60 



50 



67 



89 



89 



34 



132 



90 



62 



189 



176 



38 



154 



66 



56 



74 



95 



95 



37 



144 



100 



67 



204 



191 



43 



167 



72 



62 



80 



100 



100 



40 



156 



150 



90 



277 



247 



60 



226 



99 



84 



108 



123 



123 



54 



211 



200 



112 



344 



299 



76 



281 



125 



106 



134 



141 



141 



67 



262 



250 



133 



406 



347 



92 



332 



149 



129 



160 



158 



158 



80 



309 



300 



152 



465 



392 



107 



380 



173 



151 



182 



173 



173 



91 



355 



350 



171 



522 



434 



121 



427 



195 



168 



205 



187 



187 



102 



398 



400 



189 



577 



475 



136 



472 



217 



190 



227 



200 



200 



113 



440 



450 



206 



631 



514 



150 



515 



239 



207 



247 



212 



212 



124 



481 



500 



223 



683 



551 



163 



558 



260 



230 



268 



224 



224 



134 



520 



1000 



375 



1149 



875 



291 



938 



452 



409 



450 



316 



316 



225 



876 



1500 



518 



1587 



1146 



408 



1296 



625 



571 



622 



387 



387 



310 



1210 



2000 



631 



1931 



1389 



518 



1578 



787 



728 



757 



447 



447 



378 



1472 



3000 



855 



2617 



1820 



727 



2138 



1089 



1019 



1026 



545 



545 



513 



1996 



4000 



1061 



3247 



2205 



924 



2653 



1371 



1294 



1273 



632 



632 



637 



2476 



5000 



1255 



3839 



2555 



1112 



3137 



1639 



1557 



1506 



707 



707 



753 



2924 



10,000 



2110 



6460 



4061 



1982 



5275 



2855 



2872 



2532 



1000 



1000 



1266 



4923 



A review of these formulse shows that widely different results 

 may be arrived at by applying any two of them under like con- 



* The author will feel much obliged for any other proposed formulae, and for any 

 expression of opinion as to its reliability or otherwise. 



