Aguilar: Waters of Angat and Montalban Rivers 51 



Table 6.— Results of analyses and computat 



[Period of observations, May 23 to September 7, 1921. Numbe 



"rf col! 



aiiow 6). 





iarsr 



■_*.*- 



M*. 



H 



*fcr 



i : i 

















af m 









,,.-. 



1U0.W 





t: 









^ZLues 





il 









^ 









« 















mo 



A negative value indicates that no soda is required. 

 Formula 3. — Foaming and priming coefficient. 

 F = 62 (rNa + 1-258 rK). 



Foaming F > 200 



Formula 4. — Corrosion coefficient. 

 C = 1.008 (rH + rAl + rFe + rMg - (rC0 3 -f rHC0 3 ) . 



Corrosive 



Noncorrosive 



Semicorrosive 



i directly proportional to the value of (C -f- 1.008 rCa). 



