How did the features of the River Derwent drainage basin contribute to the March 1999 flood?
The river discharge was high due to the steep slopes, and the bedrock was made up of mainly shale thus water ran quickly into rivers. The Sea Cut was dug to reduce the amount of water in the Upper Derwent, therefore the water could not be contained and reached 51m3/sec in march from the normal flow of 1m3/sec. The flood hydrograph of the selected rivers during the March 1999 flood shows that the Buttercrambe discharged the most amount of water, with levels reaching 160m3/sec on the 9th of March. Explain why people believed that they were not at risk of flooding? People believed that’s they were not at risks of flood because an extreme flood did not occur in such a long time. Some people may not have had any knowledge of the altitude of land that they live on, thus may have believed that they were in no risk of flood water reaching them. Suggest why so many people did not receive a flood warning? The flood warnings may not have been formal People may have not understood or heard the flo
