To determine the coverage along the branch line you choose the distance between sprinklers or the distance to the wall or obstruction for the end sprinkler. Then you use the distance between sprinklers or twice the distance to the wall, which ever is greater. The distance along the branch line is then defined as S.
To determine the coverage between branch lines you choose the distance between branch lines or the distance to the wall or obstruction to the side of the branch line. Then you use the distance between branch lines or twice the distance to the wall, which ever is greater. The distance between the branch lines is then defined as L.
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