SWMM56

MWH Soft Changes Name to Innovyze   New Name Reflects Company’s Unique Water Modeling and Management Offerings and History of Innovation Broomfield, Colorado USA, March 27, 2011  — MWH Soft is pleased to announce it has a new name, Innovyze. The new name and logo more accurately reflect the company’s rich history of creating innovative, technically advanced modeling and management solutions for the world’s water and wastewater communities. Historically the hydraulic modeling and management market has been led by two companies, MWH Soft and Wallingford Software.  In 2009, these two companies combined to offer world-class customer support and to pioneer software tools that meet the technological needs of water and wastewater utilities and engineering organizations worldwide. “The name Innovyze brings together the best characteristics of innovation and analyze, which is represented in our combined organization.  It means to introduce something new and to change

Subject:  Node Time Step in SWWM 5 The node time step in SWMM 5 is based on the maximum depth of the node, the last time step and the change in depth at the node between the current time step and the last time step.  It is calculated at the beginning of each time step in the dynamic wave solution of SWMM 5.  The maximum depth is the difference between the crown elevation of the node and the invert of the node. It is normally much less than the link  time step in SWMM 5 and is only important at the beginning of the simulation when the depth between the current node depth and the old node is large (Figure 1).  This is especially true if a hot start file is not used and the node starts out empty.   If the node time step is smaller than the link time steps it will be listed in the Table Time Step Critical elements (Figure 2).

Subject:  SWMM 5 Node Step vs Link Time Step Normally the node time step is not important except when the pipes and nodes are dry or have a small depth and the inflow to the node is high compared to the surface area of the node.