Drop lines on gravity?

[Dfrenzy]

Ok i'm ready to make up drop lines for a gravity feed. I am thinking of putting 3 gravity lines up with ten drops on each line all feeding to a 50 gallon drum. How long should my drop lines be and how much drop should I have in my gravity line?

[spencer11]

drop lines should be 28"-32"-36". if your on 5/16" line a max of 30ish taps per line. min. of 2% slope max of...maybe 30%

spencer