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Thanks guys. I will make the changes and hope it works out well.

Hydrocad wants me to enter information about the overall percent void of my pond. what is the recommended percent void for a stormwater pond constructed of earth berms? Hydrocad talked about stones and gravels, but not earth-berms or compact soils. The pond is a Micropool extended detention...

Thanks psmart. I think I would model both scenarios and compare. I am hoping that including the forebay would attenuate the peak discharges even further. I am not sure what the effects are.

The forebay is part of the pond. its a cell within the pond itself and shares same elevation as the pool, just a berm separating the forebay and the pond pool if you will. Now, according to MD regulation, the forebay is sized to contain 0.1" per impervious acre. Please tell me if I am missing...

I was able to get the 10-yr storm peak discharges below the required discharges by just reducing the size of the low-flow orifice from 9" to 8" and reducing the elevation. The other issue is incorporating a forebay and an emergency spillway to the hydrocad model. I am kinda new to hydrocad and...

I was able to get the 2 yr & 100 yr storm peak discharges below the pre-developement discharge. But NOT the 10-yr storm discharge. here are the desired peak discharges: 2-yr = 3.22 cfs 10-yr = 4.45 cfs 100-yr = 15.04 cfs I have also reposted the project file...

The results are not really consistant with the estimate from the pondsizing report. I am not sure if I understand how to use the pondsizing report following the link. it tells you the ac-ft you need to get the desired peak discharge. Is this the size you have to adjust the pond physically to get...

I am using hydrocad and modeled the devices correctly. I have tried manipulating the size and elevation of the devices on the riser structure. I can not increase the size of the pond itself due to physical limitation. The pond is big already. But I am thinking about increasing the height of...

Thanks. I wasn't sure if I was in the right forum.

Do you mean increase the height of the riser structure? or just increasing the size of the pond itself. The pond does not have a pre-treatment forebay which was not required back then when it was designed. Would adding a forebay (which holds 10% of water quality vol) reduce the peak...

Hi guys, I am using hydrocad to model my pond and I am trying to reduce the peak discharges for the 2 yr, 10yr, 100 yrs storm to the pre-developement discharg rate. The pond has a riser structure with 2 orifices at different elevations and a 24inch diam culvert outlet pipe (device 1). I tried...

hi guys, I am trying to attenuate the peak flows for the 2, 10, 100 yrs storm to the pre-developement peak discharges. The pond has a riser structure with 2 orifices at different elevations and also a principle spillway. I tried modifying the elevations of the orifices but still can't get it...

I am going to put in a request for my company to buy Hydrocad. I was wondering if you have any suggestions. tx.

The existing pond has been sized for the largest storm event. However, I am trying to find out how to control the desired discharges for each event. As mentioned above, the limiting discharges are the desired discharges for each event. what I am trying to do is find out what the storage volume...

The hydrocad sizing report was very helpful. Just to make sure that I understand the sizing table output. Should I use same table to estimate storage required for all the storm events. Here are the limiting outfall discharges: Q-2yr storm = 3.2 cfs Q-10yr storm =4.45 cfs Q-100yr storm =15.04...

Thanks guys, I was able to read-up on some of the documentation and decided to use Hydrocad to model the system and everything worked great. The output from Hydrocad is alot easier to understand and makes sense. However, I need to reduce the post construction peak discharge for the 10-year...

I was able to do some calculation following what I read from the discussion with some actual numbers. It really helped to get some input from other people because I am not really confident in what I am doing. The real problem is this: I have a parking lot that is been redeveloped with...

The pond is a 24 hrs detention pond with a Riser structure (8-ft) from pond invert. The riser structure has three stages: a 8"x12" weir opening, a 12" orifice, and the principle spillway (top of riser structure). The riser structure is connected to a 24" diam culvert outlet. The drainage area...

Hi guys, I feel really silly asking this question. But, how do you find what the storm event elevation is? for example, a 2-yr storm runnoff is 2-inch, peak discharge 2.3 cfs. I have a pond with bottom elevation at 100-ft, surface area 200 sf. what would be the 2-yr storm elevation in this pond?