ToC, peak flow changes with drainage ditch relocation
ToC, peak flow changes with drainage ditch relocation
(OP)
Suppose I have a square shape pasture subcatchment (2 square miles) and it currently drains to a ditch long its border. Now, I am taksed to relocate this ditch to the basin center.
Since the TOC will be decreased (probably not by exactly one half, but I am sure it will be decreased), so the peak flow under same return period will be increased.
In order to make the new ditch handle the same level of runoff flow (or the same return period), the new ditch needs to be larger than the existing ditch.
Does this sound reasonable to you? I have a hard time to explain this to the local governing authority. They think the new ditch will be the same or very similar size as the old one.
Since the TOC will be decreased (probably not by exactly one half, but I am sure it will be decreased), so the peak flow under same return period will be increased.
In order to make the new ditch handle the same level of runoff flow (or the same return period), the new ditch needs to be larger than the existing ditch.
Does this sound reasonable to you? I have a hard time to explain this to the local governing authority. They think the new ditch will be the same or very similar size as the old one.





RE: ToC, peak flow changes with drainage ditch relocation
RE: ToC, peak flow changes with drainage ditch relocation
Thanks for confirming that the ditch will need to be larger. -PG.
RE: ToC, peak flow changes with drainage ditch relocation