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Clay - The Permanent Solution

NCPI Toolbox


NCPI Toolbox is a group of three NCPI-developed programs that provide engineers tools for calculating Trench Load, Hydraulic Flow and Leastcost. The programs contained in the Toolbox are designed to solve many of the design problems associated with sanitary sewer lines. For additional information or clarification, please contact your NCPI field representative or a member company.

NCPI Toolbox 2016 is compatible with mobile phones and tablets.  This ensures availability in the field as well as at the office!  There is nothing to download or install, simply run in any JavaScript enabled browser any time, anywhere!

Trench Load is a design program incorporating Marston's equations for soil loads on rigid conduits and the latest ASTM requirements.

Hyflow utilizes Manning's open channel flow equations to determine hydraulic solutions.

By entering the desired flow rate and slope, the recommended pipe diameter with depth of flow is instantly displayed.

Leastcost uses historic inflation and interest rates together with life cycle analysis to provide an equitable cost comparison between various materials options over the service life of an installation.

To comment on these tools, discuss your results or ask questions, please call 262-742-2904 or email.

Log in to request a hydraulic calculator

Using CLSM with VCP means installation at greater depths is possible –

minimizing the need for pumping stations. Find out more in our Information Center.

Please Register

Most of the materials on this site are available without registering, but if you register we’ll keep you up-to-date with the latest developments in research and our newest publications. Register now to request a hydraulic calculator, download the current NCPI Engineering Manual or

request an educational seminar.

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For information about purchasing pipe, please contact one of our member-companies.


NCPI National Office:

N6369 US Hwy 12, Suite A

Elkhorn, WI  53121


©  2019 National Clay Pipe Institute. All rights reserved

Information provided on this website is informational only and should not be substituted for the guidance of a qualified professional.