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Picture of ♻ PLASTIC BOTTLE RAIN GAUGE ♻
This is a simple rain gauge made from a plastic bottle. My father tought me how to do it.
We always use it for deciding if and when we should water our fruit trees. (keep in mind that on a hot summer day 4 or 5 mm of water a day evaporated from the ground, so if it rained 50 mm, you don't need to water your trees for about 10/12 days).

Step 1: WHAT YOU NEED

Picture of WHAT YOU NEED
MATERIALS:
_plastic bottle (conic or funnel shaped);
_strong tape;
_stick or cane.
TOOLS:
_cutter;
_permanent marker;
_scales or capacity measure for liquids;
_ruler.
 
Kiteman2 years ago
Er... Why do you start your sentences with an underscore instead of a capital letter?
marcellahella (author)  Kiteman2 years ago
Because each sentences with an underscore is a step (and so I wanted to mark them)... but I also forgot to use the capital letter.
mathiemom2 years ago
Love the math!!
marcellahella (author)  mathiemom2 years ago
Thanks
wazzup1052 years ago
Why have I never made one of these... probably the math part .... Now there's no reason left :)
dchall82 years ago
Excellent use of math to solve a tricky problem.
Lorddrake2 years ago
Very nicely done.

FYI you have a typo in step 3 ..
it should say 4.3cm•4.3cm•3.14=58cm2 not 4.6cm•4.6cm•3.14=58cm2
marcellahella (author)  Lorddrake2 years ago
thanks, i m going to change it immediately, thank for saying it!
marcellahella (author)  marcellahella2 years ago
please if anyone see other mistake or incomprehensible things please let me know