Hobas Pipe USA is offering a Hydraulic Calculator that compares flows of pipes of two different diameters. It uses Manning’s coefficient to account for various hydraulic scenarios and works for new construction or rehabilitation. This tool is provided free of charge as quick reference guide. To request a free calculator, e-mail KPaggioli@HobasPipe.com. Place “calculator” in the subject line and include your complete mailing address. Or to access the calculator on the Hobas Pipe website, click on the offer in the news section under hobaspipe.com.