Guidance on storage-compensation rules for shorter disconnection lengths.
Link to this table.

Disconnection length provided 0 to 14 feet 15 to 29 feet 30 to 44 feet 45 to 59 feet 60 to 74 feet 75 feet
% Vwq treated by disconnect 0 20 40 60 80 100
% runoff storage needed 100 80 60 40 20 0
Maximum storage volumea (ft3) 40 32 24 16 8 0

aassuming 500 square feet roof area to each downspout disconnection

This page was last edited on 6 August 2022, at 14:50.