Manning's n - Urban, Sub-urban, and commercial areas
Manning's n - Urban, Sub-urban, and commercial areas
(OP)
While every textbook and reference in the world has extensive descriptions and methods for determining Manning's n in natural floodplains there seems to be nothing out there for urban, suburban, or commercial areas. I've worked through some different methods making guesses at some parameters but my "gut" is I'm coming in low.
Anyone have suggestions or references? With the ever growing population in floodplains I find it hard to believe no research has been done.
Thanks
Anyone have suggestions or references? With the ever growing population in floodplains I find it hard to believe no research has been done.
Thanks





RE: Manning's n - Urban, Sub-urban, and commercial areas
RE: Manning's n - Urban, Sub-urban, and commercial areas
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For overland flow, paved or otherwise, I use NRCS's TR-55, which are what DMcGrath referred to. They are on page 3-3 of TR-55, available free from here:
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Remember, amateurs built the ark...professionals built the Titanic. -Steve
RE: Manning's n - Urban, Sub-urban, and commercial areas
Actually, their equation is for natural channels, but their Table 3-3 on page 36 has Manning's n values for artificial channels. The values change for different flow depths.
RE: Manning's n - Urban, Sub-urban, and commercial areas
RE: Manning's n - Urban, Sub-urban, and commercial areas
Remember, amateurs built the ark...professionals built the Titanic. -Steve