My roof is pretty small. Is it worth it for me use a RainReserve Diverter Kit?
Generally speaking, yes. One inch of rain on a 1000-square-foot roof will generate about 600 gallons of runoff. To calculate the amount of water that will run off your roof during an average rainfall, multiply the square footage of your roof by 600, then divide by 1000. Most barrels are 55 gallons, and they fill surprisingly quickly in a decent rain.