Abstract
Floods are among the most devastating natural hazards in the world. Iran and specially Makoran has big rivers and flood planning and management is mainly concentrated on riverine floods occurring during seasonal rains. This research investigate on the Lower Sarbaz and Kajo rivers and used discharge analysis of river channel-gauging time series to assess the regional water supplies and agricultural purposes. This analysis reveals that for all flood conditions especially on the lower Sarbaz river, have systematically risen for monthly maximum discharge volumes over the period of record. The Sarbaz and Kajo rivers have served as important routes for transportation and commerce since the formation. These two rivers need to be re-assessed especially in light of the predicted large increase in rainfall and water in the rivers over the next 25 years or so as predicted by the global climate change models. Iran has big rivers and flood planning and management is mainly concentrated on riverine floods occurring during monsoon. However, flash floods in hilly and mountainous areas are also common with demonstrated damage potential. Flood events in arid areas can be extremely damaging with increasing development, particularly in Garmbeet and Bahowkalat area (Down-stream of Pishin Dam). Flood protection and drainage design are considerable importance. Existing flood risk models are inadequate, and predicted changes in the climate show that there may be much more water in the system in the near future. New models are being built to test how the river-floodplain systems will respond to large increases in the discharge in the future.
Highlights
Stream and rivers provide water for drinking, watering animals, irrigation and for human habitation for over thousands of years
Water discharge during flood 1997 and 2005 Water resources authority released excess flood water without any consideration to downstream agricultural farms and villages which damaged many lives and farms land, it was a deliberate mismanagement by the authority and there is lack of any flood by pass or diversion canal to that particular area on the other hand there were occurs drought because entire water released from Pishin dam
The flow data was obtained from 12 months from January to December has been tested by computer excel program the peak discharge was ranging from 3012 m3/sec the same river on the month of April suddenly rate of flow dropped to 6 m3/sec even though for other months during summer rate of flow for Sarbaz and Kajo rivers are completely drought or nil discharge according to the dry months when there is no rainfall at all in Makoran region
Summary
Stream and rivers provide water for drinking, watering animals, irrigation and for human habitation for over thousands of years. Water discharge during flood 1997 and 2005 Water resources authority released excess flood water without any consideration to downstream agricultural farms and villages which damaged many lives and farms land, it was a deliberate mismanagement by the authority and there is lack of any flood by pass or diversion canal to that particular area on the other hand there were occurs drought because entire water released from Pishin dam In this case minimum water should be release from the reservoir and maximum water can be stored. As the reservoir rises and reaches each intake, the corresponding outflows adjust on a continuum with one outlet submerged it could be possibility in the case of flooding all outlet perhaps would submerged , where after the reservoir fills, so discharge is passed both through the sluiceways and over the spillway (Figure 1) Speaking it varies each year, monthly outflow averages common range and depending on the rainy month. Five meters high spillway structure would be inflated or dropped into place only during events that could require use of the additional flood control storage [4,5]
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