Thank you for your responses. This is exactly how I feel. They are wanting conservative. But in this instance there is no channel it truly is an area of shallow concentrated flow. Only one municipality is doing this, but they provide no guidance.
I have been asked to limit shallow concentrated flow to 400' in a time of concentration calculation. Not sheet flow...… When I asked they said there were studies done. And I asked about the use of time of concentration equations for the area between the 400' and channelized flow. They...
