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United States Department of Agriculture

Agricultural Research Service

Research Project: ENVIRONMENTAL AND SOURCE WATER QUALITY EFFECTS OF MANAGEMENT PRACTICES AND LAND USE ON POORLY DRAINED LAND

Location: Soil Drainage Research

Project Number: 3604-13000-009-00
Project Type: Appropriated

Start Date: Dec 23, 2006
End Date: Dec 22, 2011

Objective:
1. Measure and quantify water quality, water quantity, and soil quality effects of innovative conservation and source water protection practices as well as different land use management at the field, farm, and watershed scale for the Upper Big Walnut Creek and other appropriate watersheds. 2. Develop and validate watershed scale water quality models and quantify the uncertainties of model predictions at field, farm, and watershed scales for the Upper Big Walnut Creek and other appropriate watersheds. 3. Develop models and decision support tools to determine the efficacy of management and land use options under conditions of changing climate.

Approach:
Quantify the influence of conservation practices and land use on the water chemistry and hydrology of agricultural drainage ditches and streams in the Upper Big Walnut Creek watershed using a before-after-control-impact (BACI) paired watershed design. Two pairs of watersheds, one pair characterized as drainage ditches and one pair characterized as streams, have been identified and instrumented with flumes and automated samplers. Discharge and water samples will be collected automatically via Isco equipment. To quantify how much the loading to headwater streams is reduced by watershed scale adoption of nutrient and pesticide management practices, water samples will be collected using both time and flow proportional sampling. The samples will be analyzed for nutrients using colorimetric flow injection analysis and for pesticides using gas chromatography and ELISA. Apply a calibrated watershed scale model to aid selection, placement and extent of BMPs. Determine the impact of conservation practices on aquatic communities in lotic ecosystems by measuring and quantifing in-stream habitat (water depth, velocity, wet width, and substrate types), in situ water chemistry measurements (dissolved oxygen, pH, conductivity, water temperature), and aquatic communities in each site three times a year in the spring, summer, and fall for the duration of the study. Conduct field experiments to determine the influence of herbaceous riparian buffers on the physical habitat and aquatic communities in agricultural drainage ditches. Geomorphology and riparian habitat will be sampled once a year, while in-stream habitat, water chemistry, and aquatic communities will be sampled at least three times a year for two years. Laboratory, field, and modeling approaches will be used to assess and characterize the environmental aspects of urban and golf course turf, including the development and evaluation of management strategies and/or technologies. Before – after watershed scale studies will be used to quantify the fate and transport as well as aid in the determination of the processes and management controlling the fate and transport of nutrients, pesticides, and sediment from turf environments and urban landscapes. Laboratory studies, replicated plots, and paired field sites will be used to evaluate innovative technologies, strategies and/or management practices.

Last Modified: 9/10/2014
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