# WMS:Hydrologic/Hydraulic Calculators

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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 commands are available in the *Calculator* menu:

- Compute GIS Attributes
- Opens the
*Compute GIS Attributes*dialog which allows computations from standard GIS formatted files. - Compute Coverage Overlay
- Opens the
*Coverage Overlay*dialog. - Compute Travel Times
- Opens the
*Compute Travel Times*dialog. WMS provides two methods (*basin data equations*and*travel time equation*) of computing travel times for lag time and time of concentration from the geometric data being used for basin delineation and parameter estimation. *Hydraulic Toolbox Units*- A submenu that allows changing the hydraulic units. It has two commands:
**U.S. Customary Units**and**SI Units (Metric)**. - Channels
- Opens the
*Chanel Calculations*dialog. Beginning in version 9.1, WMS uses the*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. - Weirs
- Head or flow over a weir can be determined using the
*Weir Analysis*dialog. - Curb & Gutters
- Opens the
*Curb and Gutter Analysis*dialog to examine flow across storm drain inlets for a variety of curb and gutter openings. - Detention Basins
- 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. - HY-8 Culvert Analysis
- A web-based program with a variety of calculators that can be used with WMS.

## Related Topics

WMS – Watershed Modeling System | ||
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Modules: | Terrain Data • Drainage • Map • Hydrologic Modeling • River • GIS • 2D Grid • 2D Scatter | |

Models: | CE-QUAL-W2 • GSSHA • HEC-1 • HEC-HMS • HEC-RAS • HSPF • MODRAT • NSS • OC Hydrograph • OC Rational • Rational • River Tools • Storm Drain • SMPDBK • SWMM • TR-20 • TR-55 | |

Toolbars: | Modules • Macros • Units • Digitize • Static Tools • Dynamic Tools • Drawing • Get Data Tools | |

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