Comparison of the H2OMAP SWMM5 Hazen Williams Force Main Solution to a HW Solution
Note: Comparison of the H2OMAP SWMM Hazen Williams Force Main Solution to a HW Solution In this example, we compare the force main head loss in four links in H20Map SWMM to the head loss in a steady state Hazen Williams solution for the same length pipe, diameter and flow (Figure 1). The H2OMap SWMM model has a large constant dry weather inflow at the wet wells which floods the wet well and causes a constant pump flow to the force main (Figure 2). The HW calculator is located here http://www.engineeringtoolbox.com/william-hazens-equation-d_645.html and a comparison for HW head loss in PSI for 5000 feet long, 3 inch diameter pipes with HW Coefficients of 130, 120, 110 and 100, respectively, is shown in Table 1. The...