Snowmelt-runoff simulation is a significant and common module in hydrological models. During the last decade, a number of hydrological distributed models, have been developed, using different snowmelt algorithms and many of the previous models have been updated with more improved snowmelt approaches. Also, an especial consideration has been developed to distributed modeling. In the present paper, snowmelt modules of hydrological models have been reviewed. Data problems to some extent have been resolved compared with the previous decade, but it is still the main obstacle. Application of Geographical Information System (GIS) has been one of the great successes and some of the models have been facilitated by GIS interface. In spite of these improvements, because of the rareness of snowmelt measurements in a few studies snowmelt components of hydrological models have been independently evaluated. It has been suggested that under the coordination of International Association of Hydrological Science (IAHS), in an international attempt, snowmelt data set of different research works that have been done so far to be colIected and made available to snow hydrologist and modelers.
)