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The location of inlets and permissible flow of water in streets should be related
to the extent and frequency of interference to traffic and the likelihood of flood
damage to surrounding property for the 25 and 100 year frequency storms. Interference
to traffic is regulated by design limits of the spread of water into traffic lanes,
especially in regard to arterials. Flooding of surrounding property from streets is
controlled by limiting curb buildup to the top of curb for a 25 year storm which is
designated as the design storm. Conveyance provisions for the 100 year storm must
also be made within defined right of way and easements.
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