208 



ALEX. L. DU TOIT. 



Table B — Frictional losses in borehole casing with varying 

 discharge. 



4/ v* 



Based on formula: — Loss of head 



'2gd 



v = velocity of flow in feet per second ; d = diameter of casing in 

 feet; g = gravitation constant; — = depth of bore in feet; and 

 /= 0-00575. 



Frictional losses in pounc 



s per square in 



ch. 









FIVE-INCH CASING. 



SIX-INCH CASING 





Discharge of 



water in gallons 



per day. 















Depths in Feet. 





Depths in Feet. 





1,000 



2,000 



3,000 



1,000 



2,000 



3,000 



4.000 



50,000 



0-2 



0-4 



0-7 



0-1 



0-2 



0-2 



0-3 



100,000 



0-7 



1-4 



2-8 



0-3 



0-6 



0-9 



1-2 



150,000 



1-5 



3-1 



6-2 



0-6 



1-3 



1-9 



2-5 



200,000 



2-8 



5-6 



11-1 



l-l 



2-2 



3-1 



4-4 



300,000 



6 2 



12-5 



25-0 



2-5 



5-0 



7-5 



10-0 



400,000 



11-0 



22-1 



44-2 



4-4 



8-8 



13-3 



17-8 



500,000 



17-1 



34-2 



68-3 



6-9 



13-9 



21-0 



27-8 



600,000 



25-0 



50-0 



100-0 



10-0 



20-0 



30-0 



40-0 



700,000 



34-0 



68-0 



136-0 



13-6 



27-2 



40-9 



54-0 



800,000 









17-8 



35-5 



53-2 



71-0 



900,000 









22-5 



45-1 



67-7 



90-2 



1,000,000 









27-8 



55-6 



83-5 



111-3 



1,100,000 









33-5 



67-0 



100-5 



134-0 



1,200,000 









40-0 



80-0 



1200 



160-0 



For temperatures of discharge in the neighbourhood of 100° F. 

 and 150° F. multiply these results by 0*9 and 0-8 respectively. 



