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Re: stage storage for underground pipe with slope
you can use a storage factor. basically, given pipe geometry, find the %full by flow area at each end of the pipe in question. average these %s and youll have a storage factor.
FULL PIPE VOL * STORAGE FACTOR = STORED VOLUME
it's an interpolation of %full in the pipe. with steep slopes and long pipes, it may be necessary to subdivide the pipe to make sure the bottom stays wet. if not, your storage factor will be off.
let me know if you need more detail.
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