Hobas Pipe USA is offering a hydraulic calculator that compares flows of pipes of two different diameters. It uses the Manning’s coefficient to account for various hydraulic scenarios and works for new construction or rehabilitation. The tool is provided free of charge as a quick reference guide. To request a free calculator, email to KPaggioli@HobasPipe.com. Include “calculator” in the subject line and provide a complete mailing address. You can also go to www.hobaspipe.com and click on the offer listed under the news section.