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

Using SCS on small drainage sheds (In conjunction with thread162-13255)

Using SCS on small drainage sheds (In conjunction with thread162-13255)

Using SCS on small drainage sheds (In conjunction with thread162-13255)

In conjunction with thread162-13255: Rational and SCS comparsion

I have a comment from a local reviewer indicating a preference for rational method in a small development site over the SCS method. While the SCS method is more suited for larger watersheds, we routinely use it for small sites because the state agencies require it's use for water quality volume calculations.

There is nothing in the local ordinance which precludes the use of the SCS method in smaller watersheds (under 20 acres).

In my experience the SCS method would yield more conservative storm routings as it is distributed over a longer storm duration.

Any opinions or thoughts appreciated. It is my belief all these methods are approximation and without a detailed study of predevelopment conditions of a watershed (gaging, monitoring and statistical analysis) that's all they are. It's funny how one or another method has been entrenched into a reviewer's mind as being "gospel" when the truth it is engineering judgement and part of the liability assumed by the sealing engineer providing the design.

RE: Using SCS on small drainage sheds (In conjunction with thread162-13255)

I think you covered it pretty well. From a technical standpoint there is nothing wrong with using the SCS method for very small sites. In fact, it has many advantages over the Rational method.

Peter Smart
HydroCAD Software

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


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