×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

STORM WATER INJECTION WELLS

STORM WATER INJECTION WELLS

STORM WATER INJECTION WELLS

(OP)
Does anyone know of any design references for storm water injection wells for runoffs in parking lots.How are the pumps and pipes sized?What are the pressures at the subsurface point of ejection.Any help will be appreciated.

RE: STORM WATER INJECTION WELLS

A few thoughts in no particular order....

Infiltrating stormwater is typically accomplished using gravity, not pumps.  Infiltration rate controlled by the surface area of the infiltration system.  Engineering analyses includes hydrologic modeling, level pool routing, and maybe groundwater mounding analysis, to ultimately determine the amount of storage that is needed since the area available to percolate stormwater will be less than what is needed to absorb site runoff "instantaneously" in almost all cases.  

EPA regulates injection wells, see:
http://www.epa.gov/safewater/uic/pdfs/fact_class5_stormwater.pdf

For guidance in designing a pressurized system maybe consult with petroleum engineer types because oil drilling typically involves a water injection system, albeit at significant depth below the ground surface.  When near the ground surface & using pressurized system I think you risk liquifying and destabilizing the soils so you should seek direction from the project's geotechnical engineer or a hydrogeologist if you are determined to use pressurized injection methods in the near-surface scenario.

What would happen if the pressurized water finds a geologic seam and emerges somewhere undesired (e.g. neighbors property, side of a hill)?  In terms of liability, one could argue in a gravity system that water finding an underground geologic seam is a natural phenomenon, but in pressurized system you may be more liable for any damage (related to soil washouts or slope failure for example).

RE: STORM WATER INJECTION WELLS

in addition to bltseattle comments regarding pressurized injection, there may also be a risk of contaminating an aquifer unless the stormwater is first treated.  This would require capture and then tertiary treatment which would be quite expensive.  For these reasons, and the risk of future liability, it is not generally recommended course of action.

RE: STORM WATER INJECTION WELLS

(OP)
Thanks for the responses to my request for information about injection wells .In City of Ft.Lauderdale,Fl. now injection wells are required for parking lot drainage rather than exfiltration fields or trenches.So.Fl.geology is basically sandy soils overlying a lime rock substrate with a high water table(-4 to -6 feet).At face value I guess to collect storm water at the surface and discharge 20 feet below ground surface you have to pump at least against the hydrostatic pressure of ground water.Any other thoughts would be appreciated.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close