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WINhydro was written by Don Grisham PE/RPLS/CPESC Contact: Don Grisham, Software Developer P.O. Box 550171 Dallas, TX 75355 Also owns A&G Software which has other programs w/McTrans. Can provide demo if written request.

WINhydro was written by Don Grisham, Software Developer P.O. Box 550171 Dallas, TX 75355 Also owns A&G Software which has other programs w/McTrans. Can provide demo if written request.

You might try WINhydro from McTrans (Univ. of Fla) http://mctrans.ce.ufl.edu/

Is H/3 not the distance from the top of slope to the beginning of the foundation? Unless otherwise allowed by geotech?

Inlets on the system should be upgrade from the storm main and should let most of the air escape. Anything remaining should escape through the lift holes in the manhole covers.

Typically scour occurs at bridges or other structures. The Federal Highway Administration Hydraulic Engineering Circular No. 18 (HEC-18) is titled "Evaluating Scour at Bridges". The program HY-9 performs calculations based on HEC-18. They also have Hydraulic Engineering Circular No. 20...

Can U not add a manhole just upsteam of the 20" water and change the grade as U cross the thoroughfare? ie:steepen the slope on the upstream side & flatten the downstream side ?

One solution is to use a prefab cattle crossing section. This is even better than the corrugated metal and can also be used as a washdown area w/sump. Can be moved from job to job. Check this site for details. Wings can be deleted for construction entrance...

Iha has the correct solution. Rossmillers formula was developed by Ron Rossmiller, formerly of Univ. of Iowa. I have included it in my software for use in the rational formula method for computing runoff and call it, of course, Rossmiller Rational. CN in the main formula is computed by the...

Texas TNRCC has been renamed Texas Commission on Environmental Quality (TCEQ). They have been delegated the responsibility to enforce the Phase II regulations in Texas. They have issued the TPDES General Permit TXR150000 (Construction) that is fairly definitive of what is required for SWPPP's...

Must compare pre-developed to post-developed and you may have to store the difference in volume. If detention, you usually can release it at a max. rate = to the pre-developed rate. If retention, you cannot release it at all. More than likely you want detention. The I of 2.85 sounds awful low...

Here in Dallas, Texas 21, 27 & 33 are common and very available.

I think what everyone is overlooking is the fact that what the client wants to do may violate the Phase II requirements of the Clean Water Act. Check the NPDES permit requiremnts for the municipality.

There are basically three types of inlets. Throat, grate and combination which has a throat & a grate. Just treat the design as a normal combination inlet. There is a lot of info available for design of combination inlets. Here is one source http://www.wrpllc.com/books/udinlet.html

Again, in Dallas, Texas, all storm drains are designed for the 100 year event. They formerly used a lesser event but that changed several years ago. 36" & 48" pipes in 100 lot subdivisions are not uncommon. It all depends on your local requirements.

If reinf. conc. pipe, the manufacturer can tell you how much deflection you can get with his pipe. A 24" RCP can be laid with a 140' radius. If you use radius pipe, it may be as small as a 65' radius. If you use a "pulled" radius pipe, 40' Get a catalog from Hanson pipe. It has...

What is "inlet stone capacity" ? I am unfamiliar with that term.

You might try using the average slope of a run of pipe or channel and determine the approx. velocity. Assume the shortest routing to be on the consertative side as far as discharge. Divide the length of the run by that value and get the travel time. You will then add that to your overland flow...

In Dallas, Texas they require that the HGL be at least 0.5' below the throat of any inlet using the 100 yr event.

Large stone 6"-12" dia.placed on geotech fabric works real well.