Storm water management and road tunnel (SMART) was built to direct water around a major meeting\r\npoint of two major rivers located in a large urban area; in addition, it doubles up as a road tunnel,\r\nthough that section is only used in major storms. Much information has come from the Malaysian\r\nDepartment of Irrigation and Drainage (DID), in the form of data and reports. Pre-project historical water\r\nflow data as well as a simple velocity-area calculation to find the tunnel capacity was used to assess its\r\nefficiency. Water level data from the DID was used to create a graph in order to calculate the minimum\r\namount of water to create flooding. Processing this information has revealed that SMART is in itself an\r\neffective flood deterrent, due to its water capacity and the lag time it creates. Although most storms\r\nshould be easily dealt with, SMART only diverts water around the critical meeting point from one of the\r\ncontributing rivers. It has no effect on the flow from the other river but it caused the sustained water to\r\nflow out. For an example, rainfall from a 100 year average return interval from this river will flood Kuala\r\nLumpur. Although the development of SMART has been considered as successful, however, the\r\ngrowing development in the other part of the city could not ensure no flooding will take place or\r\nthoroughly protect the city centre.
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