A: Based on this guide, you should allocate one (1) sprinkler and one (1) hose for every 900 square feet of defensible space. The sprinkler nozzle will be the center point of the 900 square foot 'circular' spray pattern of water including the roof of the building and landscape.
For example, if your home is 1800 square feet, we reccommend two (2) sprinklers and two (2) hoses. If you have an additional building or garage, that structure may require its own sprinkler as well.
Additional sprinklers and hoses can be added for coverage of decks, woodpiles, sheds, etc.
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