What We're Reading: Rainwater Harvesting Manual

 My school is adding a school garden next year, and one aspect of the garden will be water collection.  We plan on collecting rainwater runoff from the roof and condensation from the air-conditioning units.  In theory I know exactly what I want, but I have never designed a system of this scale (or ever) before.  I have put in a few calls and have been told that the Texas Water Development Board has written the definitive guide for rainwater collection systems. 

Why do I keep giving myself homework over the summer?