SkinnyDip
Civil/Environmental
- Aug 11, 2008
- 14
I am modeling a site and breaking it up into drainage area per BMP. I have a drainage area a little over an acre and am trying to model a sand filter treating this runoff. I have the sand filter modeled as 2 ponds. The first pond is the sedimentation chamber to allow settlement of large solids, then overflows into the second pond with the sand media allowing exfiltration. This sand filter is designed to allow storage to reduce peak flow. My problem is, I keep getting really bad oscillations with dynamic routing. Even after reducing dt all the way and increasing finer routing all the way I still get the oscillations. I get warning 87 and 80. The 80 says that pond2 exceeded pond1 by .01'. Is there any way to smooth this out? Any better ways to model a sand filter with sedimentation chamber and storage? Should I just not model a sand filter in hydrocad?