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Is there ever a time when the difference between the pre and post developed runoff is so small that you wouldn't provide detention?

For example.....I have a 20 acre site and 10 acres flow to the detention pond. I have determined a pre-developed allowable runoff rate of 50 cfs. The detention pond is designed to release 30 cfs. How would you determine the runoff rate from the 10 acres that bypasses the detention pond? I used...

What is the best automobile for checking grade breaks on entrances to parking lots. I found a thread that referenced a corvette? Any thoughts? Thanks

I'm designing a parking lot on the side of a mountain. Actually, it's not the side of a mountain but with the terrain it looks like it. What is the design criteria to make sure an automobile does not bottom out in sags and crests? Thanks for any feedback............

I'm designing an apartment complex with 300 units. How do you determine your domestic demand to size your watermain? Do you use the fixture counts per the plumbing code or do you use the average daily demand with a peak factor?

I am modeling a water system for a subdivision and I need to set my tank elevation from the pressures I have from a fire flow test. My question is which pressure do I use and why? residual or staic? Thanks for the help

I have to design a detention pond for a 10-acre development with the modified rational method. The detention pond catches 8 of the 10 acres and the remaining 2 acres bypass the pond. There is not any room within the 2 acres to put a detention pond. To determine the post developed 2 acre bypass...

For small watersheds can you use storm durations longer than 1-hr with the modified rational method?

Why does pond pack give you the option to apply the modified rational method for detention pond designs? Is there anytime you can use that method?

Which stormwater detention pond routing method is the most accurate and where can I get some information on it........

I am sizing a detention pond with a 260 ac watershed. I am using the SCS method and coming up with 22 ac-ft of storage. The actual developed property within the watershed is 60 acres. This seems to be a high required volume. When I say high volume the only thing I have to compare it to is the...

I am designing a subdivision road that crosses a drainage swale. In order for the roadway centerline to be at a reasonable elevation I will have to countersink my arch culverts. My question is...will the capacity in the culverts be same if I countersink them? The roadway is near the adjacent...

What is the largest watershed that the modified rational method can handle for detention pond design? Where can I find documentation on this watershed size? I have noticed alot of people using a rectangle hydrograph storage method for their pond routing. This would mean that the release rate...