WMS:Hydrologic/Hydraulic Calculators

The Calculators menu contains several utility functions that assist in developing hydrologic modeling input parameters, and perform design and analysis of channel hydraulics, detention basins, and culverts once a hydrologic model has been developed. The following is a list of calculator tools available in WMS:

• Compute GIS Attributes – A dialogue that allows computations from standard GIS formatted files.
• Lag Time and Time of Concentration – WMS provides two powerful methods (basin data equations and travel time equation) of computing travel times for lag time and time of concentration from the geometric data you are using for basin delineation and parameter estimation.
• HY8 Culvert Analysis – A web-based program with a variety of calculators that can be used with WMS.
• Detention Basin Calculator – The effects of a detention basin on an inflow hydrograph can be analyzed and an output hydrograph created in WMS using the Detention Basin calculator. This same calculator is also used in to define detention basin parameter input for HEC-1, the Rational Method and other hydrologic models as part of an overall analysis for a planned development.
• Channel Calculator – WMS, beginning in version 9.1, uses Hydraulic Toolbox to perform the channel calculations. It is useful to be able to analyze the conveyance and other properties of channels using Manning’s equation.
• Weir Calculator – Head or flow over a weir can be determined using the Weir Calculations dialog.