Rooftop Catchment
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- Get cheapest washed gravel - small works better
- Porosity of pea gravel is .65
- Gallon/day/person - 15 gal/day bath-cooking-water-animals
- 3-1 long to wide
- 2x depth away from house
- Go down to 1 micron - 500 gallon tank
- Reef Industries - 19 mil - should be about 30 cents per square foot.