Drain to beach

[nmbertram]

We are trying to design an appropriate method of draining stormwater from a water treatment facility to the nearby coastal area. Currently the facility has a splash pad that is constantly being buried under blowing sand. An idea that was brought up was to use perforated pipes buried under the sand to disperse the storm water, but I'm having trouble finding any resources as to length/size of the pipes. I know that this is similar to a leach field design, but I don't need to have the treatment capabilities of a leach field, so I think that I wouldn't need as large an area. Does anyone have any experience in this sort of problem that can give me any recommendations as to good references or design ideas.

Thanks

 

[layfieldman]

I'm more used to the design of draining water away from an area rather than introducing it to one but wouldn't using perforated pipes increase erosion of the sand? Not sure on that but might be something you want to check on. Ofcourse using solid pipe will create erosion at the outlets but isn't that what LA County used to do/does? Let me know if I am way off base.

 

[Cadi1]

Is it only the splash pad being buried or the pipe too?
Does the flow from the pipe have enough force to clear the end if it becomes buried?
Is the problem erosion? If so, what is occurring?

If this outlet is to a beach that is dynamic, I would think that the burial of perforated pipes might work in the short term, but they could potentially become uncovered.

 

[SlideRuleEra]

I have designed some very small-scale French drains that are completely buried; they do not daylight anywhere. Buried lengths of perforated pipe collect water. Buried lengths of unperforated pipe transport it to a slightly lower elevation. Buried lengths of perforated pipe discharge the water back into the soil (at the new location).

I have the total cross-sectional area of the "discharge" perforations double the toal cross-sectional area of the "collection" perforations. One of these systems has been in use for over 10 years and works well, but slowly. Suggest the ratio of "total discharge port cross-section" to "total collection port cross-section" be increased substantially - an educated guess, maybe 10:1 or 20:1

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