Make a simple Rain Gauge
A rain gauge allows you to keep track of summer or winter rainfall, and this simple rain gauge is made by recycling a plastic juice bottle.
Plastic bottle, clean and dry
Permanent marker, black
Bucket for mixing
Cement mix:  cup sand -  cup cement -  cup water
Buy everything you need for this project at Builders.
1. Mix together the cement mix in a bucket. Slowly add water until the mix has the consistency of thick porridge.
2. Remove the top of the bottle - about 20mm below the neck - and place a 30mm thick layer of cement mixture at the bottom. Leave this to cure for 4 to 5 days on a flat, level surface. The cement acts as a weight for your rain gauge and provides a level within the bottle.
3. With a tape measure, mark the bottle at every 10mm (1cm) intervals. Make it easy for you to read the measurements on the bottle and number accordingly from 1 to ...
4. Place the bottle top upside down to act as a funnel for rain water.
Now your rain gauge is ready for use. Place outdoors in an open area that is away from buildings and trees.