Abstarct: The study area includes the northern heights of Kalateh Molla in the city of Damghan, which, like most areas of Semnan province, is facing severe water shortages. Despite the severe shortage of water in this area, every year large floods flow from the northern heights of the village and while losing a significant volume of high quality water, they cause a lot of damage in the area of Kalat-e-Mola. . In this study, flooding in the northern heights of Kalathamla village has been investigated. There are two main waterways in the study area, which are called Peshaki and Varchekouh issues. According to the available statistics as well as the information obtained from field visits, it can be seen that the high concentration of rainfall in the region, the low permeability of most formations in the region, the very steep slope of the mountainous region (which is about 42% on average) The bareness of the majority of rocks in the mountainous part and the insignificant vegetation have caused the area to have a high flood potential. Due to the relatively large flood water heat that occurred on September 19, 1398, the peak flow rate of the said flood has been estimated using the Manning method. Then, using the reasoning method, the runoff coefficient for Peshaki and Verchandkoohi basins is estimated to be 0.37 and 0.28, respectively. Using the information of showers with different continuities and return periods in the nearest synoptic station (Shahroud meteorological station), the volume and peak discharge of the relevant floods for the fishery and mountainous basins have been calculated. In order to investigate the quality of floods in the region, the flood sample on April 20, 2016 has been chemically analyzed. Comparison of the chemical results of the flood sample with the groundwater of the region indicates a much higher quality of the flood sample. Thus, the electrical conductivity of the flood is equal to 810 micromoles per centimeter, which is much less than the electrical conductivity of groundwater in the region (between 4800 to 12000 micromoles per centimeter). It is also observed that the water type in the calcium bicarbonate flood sample is sodium chloride in all groundwater samples.