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  1. ftroop82

    HydroCad Exfiltration with Wet Ponds

    I added the exfiltration outlet, but wasn't sure how to input the data. Do I use the only above invert since the pond is wet? Then do I use the surface area or wetted area?
  2. ftroop82

    HydroCad Exfiltration with Wet Ponds

    I have a wet pond with the WSE of 36.0' and the top of the pond at 42.8', how would you calculate exfiltration with Hydrocad? The GeoTech report has an infiltration rate of 1.8 inches per hour.
  3. ftroop82

    Low Flow Channel in Dry Detention Pond

    Local agency wants the calculations for a Low Flow rip-rap channel in my Dry Detention Pond. How to you incorporate\model this in the pond calcs.
  4. ftroop82

    ICPR4 - Infiltraction Calcs

    Where do you find these requirements for the program: • Aquifer Base Elevation • Horizontal Conductivity • Vertical Conductivity • Fillable Porosity Is this something that has to be requested from a Geo-technical Engineer?
  5. ftroop82

    Hydrocad

    Does Hydrocad use the Saint-Venant equation (full dynamic wave)?
  6. ftroop82

    Floating Skimmer Device

    Trying to model a floating skimmer device and not sure what flow to input in HydroCAD. Per the skimmer manual I will need two 6 inch skimmers w/H=0.417. The Basin volume needed to drain in 72 hours is 226,357 cuft. I have phase in depth set at 0.42 ft and Full flow set at 1.03 cfs.
  7. ftroop82

    Existing Flow Thru Pond

    I have an existing pipe that is flowing into a large wetland(31 cfs), we are building a new detention pond that I would like the existing pipe to flow into but the pond not hold or account for this flow (free flow through the ponds outlet). Is there any way to use hydrocad to allow this flow to...
  8. ftroop82

    Inverted Pipe Flows

    Hydrocad won't allow you to enter an upstream invert that is lower than the downstream invert. How would HydroCAD model this situation?
  9. ftroop82

    Inverted Pipe Flows

    Can HydroCAD model inverted pipe flows? If, so then how?
  10. ftroop82

    Designing a road/parking lot on beach sand

    Was wondering if anyone had any suggestions for a road/parking design for beach front property? Will be putting #57 stone down for driving areas, but was wondering about the structural aspect of the road, would you use a geo-grid or something under the rock?
  11. ftroop82

    Plastic Storm Water Pipe Floating

    The town eng. required that my client pipe an existing ditch that was offsite, he refused to issue a permit until the ditched was piped, due to pressure from the adjacent subdivision. The ditch had nothing to do with my site. Therefore, I opted to use the plastic storm drain pipe. The pipe was...
  12. ftroop82

    Plastic Storm Water Pipe Floating

    Thanks BMIR the handbook looks like a good suggestion, but the pipe was in the ground for almost 4 years then popped out of the ground, was looking for a more feasible cost solution. If I were to require the referenced concrete ballast to be installed, then why not just use concrete pipe. The...
  13. ftroop82

    Plastic Storm Water Pipe Floating

    Any suggestions on a problem with corregated plastic storm drain pipe floating? I have 12" To 18" of cover(per manuf. specs.) and the ground water is approx. 3' below the IE of the pipe, its been in the ground since 2001. Looking for any solutions or similar experiences and corrections.
  14. ftroop82

    Drainage areas do not add up?

    I just added the areas up and submitted the information in a brief summary. Thanks
  15. ftroop82

    Drainage areas do not add up?

    I know the Tc changes to info, but is there a way to add these up to show a total pre flow off of a site? These two areas flow off in two different areas, but Ineed to show a total for the entire site.
  16. ftroop82

    Drainage areas do not add up?

    I have two subcatchments DA1 & DA2 , DA1=4.97 cfs and DA2=6.44 cfs, I have both areas routed thru a link to give a combined flow offsite, but the link, gives a total of 8.66 cfs. The total flow should be 11.41 cfs offsite.
  17. ftroop82

    Shape factor

    Peter, The City of Charleston Engineer has sent this reference site for the 323 shape factor Quote per Engineer "The table provided for the 323 factor is based on equation 2.1.15 from the George Stormwater Management Manual (page 2.1-34)." http://www.georgiastormwater.com/vol2/2-1.pdf
  18. ftroop82

    Shape factor

    Peter, I will email the City Engineer to get the publication for his shape factor of 323, I also checked the UH and came up with 406...
  19. ftroop82

    Shape factor

    323 Shape Factor 484 Shape Factor t/Tp q/qu q/qu 0.0 0.000 0.000 0.1 0.081 0.005 0.2 0.235 0.047 0.3 0.406 0.148 0.4 0.568 0.302 0.5 0.708 0.481 0.6 0.820 0.657 0.7...
  20. ftroop82

    Shape factor

    The agency does not provide any info on the UH curve for a shape factor of 323, any suggestions on where to find this UH curve?

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