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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.

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?

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

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.

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...

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

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

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?

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...

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...

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.

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

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.

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.

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

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...

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...

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?

The local agency has required that we use a shape factor of 323, how do you change this factor in Hydrocad?