I have been tasked with determining pre- and post-development runoff for a project that is 4.5 acres. However, I am having trouble determining the time of concentration (Tc) because the property slopes side to side. In other words, the topography of the land sheet flows onto the adjacent property, rather than to the roadside ditch where my discharge point will be.
If the pre-development discharge point, which would be the adjacent landowner currently, is different from the post-development discharge point, how do I calculate and compare the pre- and post-development runoff for detention purposes?
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