The Wetland Hydroperiod Analysis Tool (WHAT) was designed to analyze wetland hydrology time series data to concisely describe the annual statistical distribution of water level depths. The statistical distribution of water levels in a wetland is referred to as the hydroperiod, and is an important determinant of a wetland’s ecological structure and function. WHAT is based on The Nature Conservancy’s Indicators of Hydrologic Alteration (IHA) software (TNC, 2009) but is designed to facilitate analysis of wetland data rather than streamflow data and uses a somewhat different set of metrics. The metrics produced by WHAT can be used to determine the hydroperiod of a wetland in a natural reference condition, to compare the hydroperiods of different wetlands, or to compare the pre-development hydroperiod to the modeled or monitored post-development hydroperiod for the purposes of a feature-based water balance analysis. | The Wetland Hydroperiod Analysis Tool (WHAT) was designed to analyze wetland hydrology time series data to concisely describe the annual statistical distribution of water level depths. The statistical distribution of water levels in a wetland is referred to as the hydroperiod, and is an important determinant of a wetland’s ecological structure and function. WHAT is based on The Nature Conservancy’s Indicators of Hydrologic Alteration (IHA) software (TNC, 2009) but is designed to facilitate analysis of wetland data rather than streamflow data and uses a somewhat different set of metrics. The metrics produced by WHAT can be used to determine the hydroperiod of a wetland in a natural reference condition, to compare the hydroperiods of different wetlands, or to compare the pre-development hydroperiod to the modeled or monitored post-development hydroperiod for the purposes of a feature-based water balance analysis. |