Appendix. 



167 



Examples. ---llQ find the horse-power required to lift 500 cubic feet 

 of water 10 feet high per minute : — 



(I) -" =^ =9*47 W.H.P. 



33,000 



(2) 

 (3) 



500 X 10 

 528 



= 9-47 W.H.R 



500 X '0019 X 10 = 9-50 W.H.P. 



To find the indicated horse-power required, that is, the power to 

 hft the water and work the machinery, allowing an efficiency of 

 55 per cent : — 



9 '47 X 100 T TT T» 



■^---^ = 17-22 I.H.P. 



55 



i xVJtSJLjJtl/ JvJL* 



Showing the dimensions and capacity of drains afid sluices^ and the area 

 of land for which they are adapted. 



Bottom 



Depth of 



Fall per 



Constant 

 for 



Slope of 



Discharge 



Area 



Width 

 of Sluice 

 required. 



Width. 



Water. 



Mile. 



Friction, 



Sides. 



per 

 Second. 



Drained. 



ft in. 



it. in. 



in. 







cubic ft. 



acres. 



ft. m. 



I 



I 



6 



•60 



1 to I 



o'74 



78 



I 



I 6 



I 3 



6 



•60 



J> 



1-48 



140 



I 



2 



I 6 



6 



•60 



I to I 



2*99 



280 



I 6 



3 



I 6 



6 



•60 



>J 



3'92 



370 



I 9 



4 



I 9 



4 



•60 



>> 



5-17 



500 



2 



6 



2 



4 



•6S 



J» 



9-72 



950 



4 



8 



2 6 



4 



•65 



>> 



I7'92 



1,700 



6 



lo 



2 9 



4 



•65 



litoi 



27*36 



2,600 



9 



12 0' 



3 



4 



•6s 



f* 



37-09 



3^530 



10 6 



14 



3 6 



4 



•65 



») 



54*26 



S,i68 



14 



16 



4 



4 



•70 



>> 



81-73 



7,780 



18 



18 



4 6 



4 



•70 



lito I 



114-15 



10,900 



24 



22 



5 



3 



'1^ 



>> 



150*23 



14,300 



25 6 



26 



5 



3 



•75 



)> 



173-11 



16.500 



29 6 



28 



5 6 



3 



•75 



)} 



215*32 



20,500 



35 



30 



6 



3 



•80 



2 to I 



298-37 



28,400 



42 



32 



6 6 



3 



•80 



3 J 



361-53 



34,400 



45 



34 



6 9 



3 



•80 



>> 



403-67 



38,400 



47 6 



36 



7 



3 



•80 



)> 



450-80 



43,900 



50 



38 



7 6 



3 



•80 



J> 



521*85 



49,700 



53 6 



40 



8 



2 



•80 



J> 



617*17 



58,700 



56 



This table gives approximately the dimensions of drains and sluices 

 required for conveying the water off fens or polders. 



