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Problem statement: The most of the distributed or physically-based hydrologic and water&#13; quality models from developed countries are not directly applicable in developing countries due to&#13; both lack of data and different climatic conditions. Hence, there is a need for a study to be conducted a&#13; catchment of developed countries. Approach: From a review of various models to estimate runoff&#13; using a semi-distributed model, Soil and Water Assessment Tool (SWAT) was selected. Sequential&#13; Uncertainty fitting (SUFI-2), a program that is linked to SWAT was utilized for calibration and&#13; validation analysis. SUFI-2 is linked with SWAT in the Calibration Uncertainty Program known as&#13; SWAT-CUP. There are two stream gages with adequate data for calibration and validation in Taleghan&#13; basin with an area of 800 km2 in northwest of the Tehran, Iran. Joestan gauging station is located in the&#13; upstream and measures runoff from an area of 413 km2 whereas Galinak station located at the outlet of&#13; 800 km2 Taleghan catchment. Results: The results showed surface runoff was 21% of the precipitation&#13; for the upper part of the catchment and 33% at the outlet. Groundwater and lateral flows took place&#13; mostly in the mountainous upper part of the catchment with contribution of 23% and 17 %,&#13; respectively. Evapotranspiration losses at Joestan and Galinak stations were around 38% and 49% of&#13; the precipitation, respectively. Conclusion/Recommendations: This research has successfully&#13; developed a customized SWAT model by SUFI-2 program to be used by water engineers and&#13; managers in their planning of future land and water developments in Taleghan Catchment. The&#13; database system created in the study area, using dispersed datasets in GIS environment could be used&#13; not only for modeling purposes but also for decision making. High surface runoff and low interflow at&#13; Galinak station and inversely at Joestan station showed downstream of Joestan stations on need of&#13; greater soil conservation measures. The main reason is snowpack in the winter and good rangeland in&#13; other seasons. The study has produced a technique with reliable capability and high accuracy for&#13; annual and monthly water balance components of the Taleghan catchment

Application of Soil and Water Assessment Tools Model for Runoff Estimation