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Hydrocad 2 Different Exfiltration Rates

Hydrocad 2 Different Exfiltration Rates

Hydrocad 2 Different Exfiltration Rates

(OP)
Hi new to Hydrocad. I'm trying to model a Infiltration Pond/Basin with an exfiltration rate of 2.41, and also a Leach Pit for a wick at the bottom of the basin with an exfiltration rate of 8.27. Didn't know if I could associate 2 different exfiltration rates in the same Pond Node. Trying to save money on a bigger Remove and Replace. Any suggestions would be appreciated.

RE: Hydrocad 2 Different Exfiltration Rates

You can use two different exfiltration outlets, using the minimum and maximum elevations to restrict the available area for each outlet so the ranges do not overlap.

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: Hydrocad 2 Different Exfiltration Rates

(OP)
Another quick question. How would I want to model a Grate on top of a set of Leaching Pits? The grate is going to be used for an emergency overflow and will bubble over into an existing lawn area.

RE: Hydrocad 2 Different Exfiltration Rates

If there will be ponding on the grass, you would want to include this area as part of the pond storage volume. On the other hand, if it overflows without ponding above the grate, then you could use a horizontal orifice as an overflow device. This is very similar to the chamber overflow issues discussed at www.hydrocad.net/chambers/overflow.htm

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: Hydrocad 2 Different Exfiltration Rates

(OP)
Thanks for the quick replay. Model still is missing a piece. I have a horizontal orifice in the same Pond Node as my Leaching Pits. My Orifice is 24" x 24" with an Invert Elevation at grade. I have the node routed to another pond located 50' away that is 3' below orifice invert. Keep getting message alert that Pond #2 is over capacity when there should be more than enough storage to handle the small overflow.

RE: Hydrocad 2 Different Exfiltration Rates

You need to extend the storage data slightly above the grate in order to avoid a "storage exceeded condition. For details please see www.hydrocad.net/overfilled.htm

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: Hydrocad 2 Different Exfiltration Rates

Is your orifice is a 24" x 24" square with rows and columns of 3"x3" square orifices?

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