Constructed Wetland to Remove Nitrate: Wetland Design Hydrology By: Cibin Raj

Introduction Problem?. Constructed wetland : a solution for nitrate removal Design of wetland- location identification Evaluation of effectiveness of constructed wetland Depth of water?Residence time? Objectives To determine monthly average depth of water in wetland To find out the area extend of wetland (monthly) Estimate residence time

Study area Middle Wabash- Little Vermillion HUC

Data required for location identification Data Required Data layerSource datasetHow the layer was used in the analysis Streams National Hydrography Dataset (NHD), high resolution streams, downloaded June 2009 Used to eliminate streams as suitable locations for placing wetlands, and to approximate the location where closed drains empty into open drains Elevation National Elevation Dataset (NED), with one-third arc second resolution Used to find watersheds, describe how water flows through the landscape, and create contours for wetland design RoadsTIGER 2008 Census data, “edges” Used to break up separate crop fields and also for locating different wetland sites Cropland National Land Cover Dataset (NLCD), selecting the field “cultivated crops” Used for locating suitable sites for wetland placement and also to approximate tile-drained land in the landscape Tile drained land (estimate) From SSURGO soils and Cropland (poorly, very poorly, and somewhat poorly drained cropland) Used to locate sites that drain a large watershed of tile-drained land Hydric soilsSoil Survey Geographic (SSURGO) DatabaseTo give a general idea of areas that were formerly wetland OrthophotosIndiana Framework Data, streamed by University of Indiana Used for visualization of sites and determination of locations where closed drains empty into open ones Data required to find out the depth Ditch flow to the wetland Wetland Characteristics- size, normal pool depth Watershed Characteristics- area, percentage tile drained Evapotranspiration from wetland

Begin with available ditch flow data and dam characteristics Model the wetland inflow and outflow (possibly HEC) Obtain monthly depth of water in wetland Try to estimate the ditch flow data- as a function of watershed characteristics, rainfall etc. Methodology

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