Investigating the relationship between design discharge and floodwater spreading area in the Miankoh Staion, Yazd province

In recent years، several flood-spreading projects are constructed in different provinces. Lack of information about planning criteria caused unsuitable ratio between flood spreading area and selected design flood discharge. To find a relation between two above-mentioned parameters this investigation was performed in 70-hec area of Miankooh flood spreading station. Soil infiltration tests were carried out before and after every flood spreading event. During the research period six flood events were harvested and several parameters were measured including; discharge، volume of flood، time of flood، volume of tail runoff، time of infiltration، area of flooded sections. In total، 2767288 m3 of flood volume was harvested and 2732361 m3 of water was infiltrated. Considering above-mentioned parameters، relation between maximum input discharge and flooded area، slope of the site، length of the embankment، height of weir and flood time were estimated and the final function was offered. As a result، height of weir and length of embankment have significant coordination (99%) with maximum input discharge.