I can't figure out where in the inlet library I would enter the Free Open Area and Weir Perimeter for each inlet type. In GEOPAK this was simple to enter and you could also enter a clogging factor. How do you do this in ORD?
I also tried following the help for how to enter Neenah grates using their K factor charts. Do I understand correctly that I would need a separate entry for each of the cross-slopes from the Neenah book (1%, 2%, 4%, 6%)? Does ORD then interpolate for the actual cross-slope? In GEOPAK I didn't use the Neenah info. I only entered Open Area and Weir Perimeter with a clogging factor where necessary. Has anyone successfully modeled Neenah grates?
Josh
The area and perimeter is computed using the length and width of the grate that you enter in the catalog. The clogging is applied on the prototype.
The clogging is on the prototype under the Inlet Opening section.
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Thank you.
What dimensions are used for the weir length? The structure width and length, or the grate dimensions? On a combination inlet the weir length is the length of the grate plus 2x the width (only three sides of the grate take flow).
Also, I followed the directions here. Do I understand that the grate dimensions entered in the bottom section should be modified so that the open area using a specified grate type's "opening ratio" produces the actual open area specified by the manufacturer? This will be very misleading for anyone looking at the definition in the future.
https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/23286/which-dimensions-are-used-when-inputting-grate-information-for-inlets-in-stormcad