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Installation Report - Part 1: Surface Water Monitoring 1.0 Introduction A field project was developed to collect information for evaluating the potential for water storage in agricultural impoundments. Although designed for storm water detention the water storage characteristics, particularly the dynamic storage, seepage and evapotranspiration of agricultural impoundments have not been quantified. The field data will be used to develop detailed water budgets for selected reservoirs and to calibrate hydrologic simulation models. This information will be used to evaluate the impact of impoundment management on water supply in the watershed. 2.0 Site Selection Three sites were selected for this project to provide a range in water retention characteristics. At one site impoundments constructed on uplands were designed as water storage reservoirs. The second site was selected because it did not hold water well, although the site was primarily wetlands. The third site was selected as intermediate between the two sites. It holds water but also has a large dynamic storage capacity due to the size and shape. Unlike the other two impoundments the third site is located on shallow rock which affects long-term retention. The monitoring project was designed to develop a water budget for selected agricultural impoundments and to provide data for hydrologic analysis. (Rain + pumpage) – (evapotranspiration + seepage + discharge + returnflow) = D storage Monitoring equipment were installed at the inflows and outflows to each impoundment to provide water level data for calculating inflows and outflows. Magnetic reedswitches were install on the throw-out pumps that discharge water from the grove into the impoundment. Weather stations were established at each site to measure rainfall and estimate evapotranspiration. Groundwater wells will be established to determine seepage gradients. 5.0 References |
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