×
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

Basin Size

Basin Size

Basin Size

(OP)
Hello all

Is there a quick and dirty way to estimate the required size of a basin if I know what the peak inflow to the basin is and I know the maximum discharge of my outlet works?  Any help is greatly appreciated.

Scott

RE: Basin Size

Scott,

I'm not quite sure I follow what you're asking, but I'll try to answer.  By basin, I'm assuming you mean a detention pond (although I've never heard of a detention pond refered to as a basin).  I suppose it would depend on what is going on upstream of the basin.  Is the area large (i.e. greate than 150 acres)? are there upstream detention ponds? is there a need for water quality storage?  The maximum outflow of the pond is definitely needed however, the peak inflow into the pond has little to do with determining the required volume.  You'll need to do either a mass balance approach (i.e. flow in x time - flow out x time = storage requirement), or route a hydrograph through the pond  (Haestad Methods PondPack, EPASWMM, etc.).  Probably the best thing to do would be to check with your reviewing agency and find out what method they require.

Brian

RE: Basin Size

Yes there is a quick n dirty way.  It uses the inflow hydrograph.  If you are detaining the water then you also require the outflow discharge.  Plot the hydrograph and then draw a straight line to outflow value and calculate the volume of water detained between the two lines. increase by 10%.  And wala a first trial size of basin.  Once this works then you can tweak it to your desire.  For a retention pond, just calculate the volume of water from the hydrograph.

RE: Basin Size

Here in PA we also call detention basins by that name; I have rarely seen them called "ponds", unless they are providing some extended wet volume.

NRCS TR55 provides a very quick, one page algorithm.  Since you already know the peaks in and out, the only other info you need is the SCS curve number (this requires identifying the Hydrologic Soils Group, a list of which is also in TR55) of the watershed, Type of rainfall distribution (per map on page B2) and the runoff amount (inches, not cfs).  It is free from the NRCS (your local Conservation District might have copies) and I have used it for years without a problem.

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