**1. Introduction**

252 Soil Erosion Studies

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In recent years, severe rainfall events have been causing various negative impacts on environment and ecosystem at the receiving water bodies. Especially soil erosion and resulting muddy water problems driven by rainfall-runoff have been hot issues in many countries due to accompanying water quality impacts. Thus various efforts have been made to evaluate soil erosion and sediment yield spatially and temporarily to develop effective soil erosion best management practices. Among those, modeling approaches have been often utilized and many soil erosion models have been developed and evaluated worldwide. In the past couple of decades, these soil erosion models have been integrated with Geographic Information System (GIS) for spatiotemporal analysis of generation and transport of soil erosion/sediments. The Universal Soil Loss Equation (USLE), Water Erosion Prediction Project (WEPP), Soil and Water Assessment Tool (SWAT), European Soil Erosion Model (EUROSEM), Agricultural Non-Point Source Pollution (AGNPS) are widely used for various soil erosion studies. The input requirements for these models vary to some extents. The USLE model has been widely used because its input data are available in most countries and the model is relatively easy to implement. This USLE model has been integrated with GIS for spatiotemporal analysis of soil erosion by many researchers worldwide. The Sediment Assessment Tool for Effective Erosion Control (SATEEC) is one of them with several enhanced modules for sediment yield estimation at a watershed scale with higher accuracies in sediment evaluation. In this chapter, the development history of the SATEEC system and several SATEEC applications for soil erosion and sediment yield estimation will be introduced.
