Simulation Rainfall-runoff of Al-Teeb and Dwerege Rivers Using HEC-HMS Model

Abstract

     Floods are classified as one of the important matters that must be studied and controlled. A study was prepared for this purpose to calculate the surface runoff coming from Al-Teeb and Dwerege rivers. The hydrological modelling Software HEC_HMS Version 4.10 was used to calculate the maximum surface runoff coming from these rivers and entering the Assanaf Marsh, which in turn flows into the Al-Hawizeh Marsh. ArcGIS Software Version 10.5 was also used to analyse the maps of the study. After completing the simulation, it was found that the area of the Teeb and Dwerege river basins amounted to 7891 , of which 4850.7  was for Dwerege River basin and 3040.9  for the Teeb River basin. Actual rainfall data was used from the Meteorology and Seismic Monitoring Authority of the Ministry of Iraqi Transport for the period (2012-2022), and no processing was done for longer periods due to the Authority's policy. Simulations were made using actual rainfall data and it was found that the maximum discharge within Assanaf Marsh is 2969.7  on (3/March 2013) including 735.7   for Al-Teeb basin and 1909    for Dwerege basin, as this year is considered a flood year according to the data of the Iraqi Ministry of Water Resources. NASA rain data was also used for the same period above, and it was found that the maximum discharge into the Assanaf Marsh from Al-Teeb and Dwerege rivers was 4398.9  on (25/February/2020), and through these results it was found that NASA rain data did not give real results comparison with the actual rainfall data. It was concluded that the NASA rainfall data cannot be relied upon due to its significant difference with the actual rainfall data. The simulation results of the HEC-HMS Software were not calibrated with the actual data of the discharges of Al-Teeb and Dwerege rivers due to the lack of sufficient observations of these data, especially at the dams of these rivers.

     Floods are classified as one of the important matters that must be studied and controlled. A study was prepared for this purpose to calculate the surface runoff coming from Al-Teeb and Dwerege rivers. The hydrological modelling Software HEC_HMS Version 4.10 was used to calculate the maximum surface runoff coming from these rivers and entering the Assanaf Marsh, which in turn flows into the Al-Hawizeh Marsh. ArcGIS Software Version 10.5 was also used to analyse the maps of the study. After completing the simulation, it was found that the area of the Teeb and Dwerege river basins amounted to 7891 , of which 4850.7  was for Dwerege River basin and 3040.9  for the Teeb River basin. Actual rainfall data was used from the Meteorology and Seismic Monitoring Authority of the Ministry of Iraqi Transport for the period (2012-2022), and no processing was done for longer periods due to the Authority's policy. Simulations were made using actual rainfall data and it was found that the maximum discharge within Assanaf Marsh is 2969.7  on (3/March 2013) including 735.7   for Al-Teeb basin and 1909    for Dwerege basin, as this year is considered a flood year according to the data of the Iraqi Ministry of Water Resources. NASA rain data was also used for the same period above, and it was found that the maximum discharge into the Assanaf Marsh from Al-Teeb and Dwerege rivers was 4398.9  on (25/February/2020), and through these results it was found that NASA rain data did not give real results comparison with the actual rainfall data. It was concluded that the NASA rainfall data cannot be relied upon due to its significant difference with the actual rainfall data. The simulation results of the HEC-HMS Software were not calibrated with the actual data of the discharges of Al-Teeb and Dwerege rivers due to the lack of sufficient observations of these data, especially at the dams of these rivers.

     Floods are classified as one of the important matters that must be studied and controlled. A study was prepared for this purpose to calculate the surface runoff coming from Al-Teeb and Dwerege rivers. The hydrological modelling Software HEC_HMS Version 4.10 was used to calculate the maximum surface runoff coming from these rivers and entering the Assanaf Marsh, which in turn flows into the Al-Hawizeh Marsh. ArcGIS Software Version 10.5 was also used to analyse the maps of the study. After completing the simulation, it was found that the area of the Teeb and Dwerege river basins amounted to 7891 , of which 4850.7  was for Dwerege River basin and 3040.9  for the Teeb River basin. Actual rainfall data was used from the Meteorology and Seismic Monitoring Authority of the Ministry of Iraqi Transport for the period (2012-2022), and no processing was done for longer periods due to the Authority's policy. Simulations were made using actual rainfall data and it was found that the maximum discharge within Assanaf Marsh is 2969.7  on (3/March 2013) including 735.7   for Al-Teeb basin and 1909    for Dwerege basin, as this year is considered a flood year according to the data of the Iraqi Ministry of Water Resources. NASA rain data was also used for the same period above, and it was found that the maximum discharge into the Assanaf Marsh from Al-Teeb and Dwerege rivers was 4398.9  on (25/February/2020), and through these results it was found that NASA rain data did not give real results comparison with the actual rainfall data. It was concluded that the NASA rainfall data cannot be relied upon due to its significant difference with the actual rainfall data. The simulation results of the HEC-HMS Software were not calibrated with the actual data of the discharges of Al-Teeb and Dwerege rivers due to the lack of sufficient observations of these data, especially at the dams of these rivers.