SPRAY IRRIGATION. 



31 



Table 3 shows the number of feet which should be added to the lift 

 for each 100 feet of straight pipe to overcome the friction and to ob- 

 tain the total lift which must be pumped against. Tables 2 and 3 

 should be used by the farmer for estimating purposes, while the pro- 

 portioning of the pipe sizes in the final design should be done by an 

 irrigation engineer or by the manufacturers of the spray equipment 

 used. 



Table 3. — Number of feet to l>e added to the vertical lift for each 100 feet of 

 common iron pipe to overcome " friction head." 



[Based on Williams-Hazen formula, using a coefficient of 100.] 



Gallons 



Size of pipe. 



per 

 minute. 



3 



inch. 



1- 

 inch. 



14- 

 inch. 



Vr 



inch. 



2- 

 inch. 



mch. 



3- 



inch. 



Si- 

 inch. 



4- 

 inch. 



5- 

 inch. 



6- 

 inch. 



7- 

 inch. 



8- 

 inch. 



5 .. . 



Feet. 

 10.5 

 14.7 

 25.0 

 38.0 



Feet. 

 3.25 

 4.55 

 7.80 

 11.70 

 16.40 



22.00 



Feet. 

 0.84 

 1.20 

 1.59 

 2.05 

 4.30 



5.70 

 7.30 

 9.10 

 11.10 

 16.60 



23.50 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



6 





















8. 



0.95 

 1.43 

 2.01 



2.68 

 3.41 

 4.24 

 5.20 

 7.80 



11.00 

 14.7 

 18.8 

 23.2 



















10 



0.50 

 .70 



.94 

 1.20 

 1.49 

 1.82 

 2.73 



3.84 

 5.10 

 6.60 



8.2 

 9.9 



13.9 

 18.4 

 23.7 

















12 



















14 . 





0.32 



.41 

 .50 

 .61 

 .92 



1.29 

 1.72 

 2.20 

 2.76 

 3.32 



4.65 

 6.20 

 7.90 

 9.80 

 12.00 



16.80 

 22.30 

















16 





















18 .. 





















20 







0.25 

 .38 



.54 



.71 



.91 



1.15 



1.38 



1.92 



2.57 

 3.28 

 4.08 

 4.96 



7.00 

 9.2 

 11.8 

 14.8 

 17.8 



21.3 















25 



















30 



















35 . 







0.32 

 .41 

 .51 

 .62 



.89 

 1.-11 



1.46 

 1.80 

 2.22 



3.10 

 4.20 

 5.25 

 6.30 



7.7 



9.6 

 11.6 

 13.3 

 15.2 



17.8 



22.6 













40. 



















45. 



















50. 









0.34 



.47 



.63 



.81 



1.00 



1.22 



1.71 

 2.28 

 2.91 

 3.61 

 4.40 



5.2 

 6.2 

 7.2 

 8.2 

 9.3 



12.90 

 16.0 

 19.8 

 24.0 











60-.. 



















70 











0.21 

 .27 

 .34 

 .41 



.58 



.76 



.98 



1.22 



1.48 



1.77 

 2.08 

 2.41 

 2.77 

 3.14 



4.19 

 5.40 

 6.70 

 8.10 



9.6 

 11.3 

 13.2 

 15.1 

 17.2 



19.4 

 21.7 









80 

















90 

















100 



















120... 













0.23 



.30 

 .36 

 .47 

 .56 



.69 



.83 



.95 



1.10 



1.26 



1.68 

 2.10 

 2.52 

 3.15 



3.70 



4.35 

 4.90 

 5.80 

 6.60 



7.50 

 8.40 

 9.20 

 10.1 







140 

















160 

















180. 

















200... 













0.28 



.33 

 .39 



.47 

 .53 

 .62 



.82 

 1.03 

 1.24 

 1.50 



1.81 

 2.18 

 2.50 

 2.90 

 3.30 



3.65 

 4.20 

 4.50 

 5.10 

 5.60 





220... . 















240 .. 













0.22 



260 .. 

















.25 



280... 

















.28 



300... 

















.33 



350 

















.45 



400... 

















.56 



•450 



















.71 



500 



















.84 



550 



















1.01 



600...:. 





















1.20 



650 





















1.40 



700 



















1.60 



750 



















1.78 



800 



















2.00 



850 



















2.26 



900 



















2.50 



950 



- 1 



















2.80 



1,000 





















3.10 





1 























Table 4 is a bill of materials for the typical farm (fig. 1, p. 4), 

 and is given as an example of a form for obtaining quotations on 

 spray irrigation equipment (see also fig. 12, p. 19). " Run " means a 



