Background: Misunderstanding of disaster hinders people from devoting enough attention to disaster preparedness programs. flood is one of the main natural hazards in Iran. Objectives: The present study aimed to determine flood risk perception among residents of a flood-prone area in Iran in 2021. Methods: This cross-sectional study was conducted on 201 inhabitants of three villages along the Hesar-Golestan River in northeast Iran. A researcher-made questionnaire was used to assess their flood risk perception and opinions about the causes of the flood. flood risk perception was assessed using ten questions with a 5-point Likert scale. risk perception was calculated at three levels: low (scores 10 to 23), medium (scores 24 to 37), and high (scores 38 to 50). Multi-stage sampling technique was used for sampling. Results: The majority of participants (81%) had a moderate risk perception. The mean risk perception score was 30±, 5, which indicates a moderate risk perception. According to the participants, the three main causes of floods were environmental degradation and soil erosion, unplanned development and construction in flood-prone areas, and heavy seasonal rainfall, respectively. There was a significant relationship between gender and age with some opinions about the causes of floods. Conclusion: The risk perception of participants was at a moderate level. Low or moderate flood risk perception can lead to insufficient attention, inaction, or insufficient efforts to reduce the risk and increase preparedness for floods. Taking measures such as educating people about the causes and consequences of floods using appropriate and effective methods can help to manage disasters better.

Physical expansion of cities, particularly those that have experienced unusual growth due to economic, social, and political transformations, has led to numerous problems. To this end, the purpose of this study was to investigate conditions of Birjand City regarding flooding and hazard zoning caused by this important natural event. The present study is applied regarding the objective and descriptive-analytic considering its methodology. The study was descriptive-analytic and performed through prediction of the scope of damages caused by floods and based on hazard zoning. Data gathered regarding land use, population density, features of existing watercourses, slope, residential and population density, CN coefficient, runoff, the age of buildings, open spaces, and other influencing components. Collected data were weighed after correction and conversion, and required maps were prepared after conducting paired comparisons and determination of eventual coefficients for each layer. AHP model and associated software, particularly Expert Choice, and ArcGIS, were used to determine final weights and coefficients. According to the results, given that development of Birjand City has been done on the sub-basin of the existing watercourse, all the city is exposed to the risk of flooding. However, southern and southeastern zones with almost 20% of the city area are subject to high and very high risk; northwestern and southeastern with 50% of the area are subject to average risk; and other zones of the city with less than 30% of area are subject to low and very low risk. As a result, the operation of flood control and flood warning systems in areas with greater vulnerability should be considered, while illegal occupation of flooding basins and watercourses should be dealt with.

flood governance and risk management involve measures and strategies aimed at reducing the risk of floods and managing their impacts. This process includes identifying and evaluating risks, planning and prevention, readiness for response and performance in crisis situations, effective and rapid response to floods, and constructive measures and continuous improvement. The main approach of this research is based on five themes related to various issues related to flood risk management, which include stakeholder engagement, policies and action, research on practice, supporting tools, governance, and frameworks. The study of flood risk management has experienced significant developments over the past two decades. Attention to the application of flood risk management and comparative analysis of flood governance in flood management studies has been undertaken, which means creating a complex arrangement that shapes the behavior of governance and social actors regarding flood risk management. Based on the results of the review of research sources, the main structures of flood risk management and flood governance studies are strongly interrelated but also differ in their main structures, which are evident in the discovered keywords in the analysis. The articles were codified based on the main topics in MAXQDA software, and then the complete sets of codes in all reviewed articles were examined. The findings of the research show that improving flood resilience requires extensive efforts in the fields of physical and social sciences. Researchers should, for flood forecasting and modeling, in addition to the physical sciences, develop social science tools. These actions can help improve the planning and management of flood crises and reduce their social and economic effects.

The frequency and severity of floods has increased globally. However, in many parts of the world, especially in developing countries, there is no accurate data for estimating the probable of flood risk. In this research, flood risk zonation has been done for delineation of flood fringe in Gamasiyab River (south of the Sahneh city, east of the Kermanshah province). The simulation of the flood has been carried out based on the HEC-RAS (one-dimensional hydrodynamic model), and the geometric data has been processed in the GIS by the HEC-GEORAS extension. Also peak discharge in diffrence return periods has been calculated using SMADA software by Type III Pearson distribution. The study area has been divided to four reaches based on river patterns and then manning's roughness coefficient has been calculated for each reach. The results show that 23. 78 km2 and 42. 1 km2 of the river floodplain have been inundated by 25-year and 100-year return periods respectively, so that amount of damage from the 100-year flood was higher than the 25-year flood. Also the width of inundation area in the reaches 2, 3 and 4 indicated that 25-year return period was not good criteria for flood fringe. It is necessary to study the other features of the river, including bed morphology, river depth and river pattern.

In dam construction industry, the safety of dam is one of the most important challenges that should be considered in design, construction and operation phase. Recently, use of quantitative risk analysis, as a useful tool in dam safety risk management, is rapidly increasing. In this paper, first, risk assessment methods in dam safety are investigated and ANCOLD guideline for dam safety risk assessment is detailed. Then, as a case study, safety of Goleastan dam, in northeast of Iran, is assessed considering risk analysis approach for upstream flood hazard. For calculating the probability of failure of dam, the various methods were assessed and finally Event Tree Analysis (ETA), as most commonly method in dam safety risk analysis, was used. The number of life losses due to flooding of Golestan dam break is estimated based on USBR methodology, known as DSO-99-06. Finally, according to calculated risk and comparing with different criteria for acceptable risk, it is obvious that the risk of Golestan dam break due to upstream flood is unacceptable and immediate risk reduction measures are necessary.

By occurrence of climate change phenomenon and increasing of human’ s interference on global climate, two natural disasters mamely drought and flood have effected on different parts of the earth. In the recent years, our country was alternatively witness in occurring of floods and sever droughts in most of places, specially twice occurring of these natural disasters, improve each other as because of severe droughts, vegetative coverage and humidity of soil are spoiled that is facilitation agent for flowing destructive floods. On the other hand, occuring of severe floods have destroyed agricultural lands and lynching fertile soils and has amplified the effective of drought in these places. In a watershed which has high submergible potential, with an alternative and correct management, we can reduce the effects and damages of flood and use of it for increasing of water potential in this place, for example increasing of soil moisture and discharging of aquifer and increasing of water resources of lake of dams. For succession in these actions, an alternative and optimum flood risk management in that watershed is necessary. Kardeh watershed is located near Mashhad, and is considered as a case study. The risk of flown floods in this basin is modulated with three flowing types of statistical models: 1) probability Distribution Function, 2) Linear Regressive Model, 3) Auto Regressive Independent moving Average (ARIMA) Models. According the results of models testing, Probability Distribution Function couldn’t be able to model the floods risk in basin. Regressive Model doesn’t offer acceptable responses because it obeys from one general trend. ARIMA Time Series Models are tested in difference stages and finally, ARIMA (1, 2, 3) Model offer the best statistical fitness. According the conclusion from this research, by using of three statistical models, we can get a fit model for flood risk management for (Kardeh) basin, that It is usable into practical and conclusion of this research is expansible and usable for the other similar watershed basin.