Flood control and management of urban waterways is an essential part of urban planning and a quality of life issue for many residents living in floodplain areas . Flood control management issues are of great concern to businesses and individuals located in an area because a flood can bring economic activity and ordinary life to a halt within a few hours of intense rainfall. Some residents are more affected by flooding than others and this may have regional impacts depending on the geomorphology of the affected areas. For example, an area of ​​a city may not be as affected by flooding because that location might be in a 100-year floodplain area, meaning that a major flood will only occur in that area approximately once every 100 years. Similarly, other areas of a city might be in a 10- or 5-year floodplain zone and are at greater risk of experiencing flooding of greater magnitude and frequency. These frequently flood-prone areas are particularly important to the regional flood control plan; however, all regions, regardless of flood risk, could potentially be affected by political considerations when designing a river management plan. Neighborhoods adjacent to watercourses but experiencing only sporadic flooding could be located in an advantageous hydrological region for preventive flood management. City planners have a variety of options for controlling urban waterways, and each option has advantages and disadvantages. A major consideration will be the cost of the water management project relative to the perceived benefits of reduced flooding. Flood control projects must take into account the neighborhoods affected and the total costs incurred by the municipality and the interior...... middle of paper ......Without the natural vegetation which naturally slows down the speed moving water, these concretes dry out. Stream beds could actually cause more flooding in low-lying areas of the city while quickly draining water from other areas (Guo, 2001). Flow retarding structures were also constructed to limit the adverse downstream effects of urban runoff and increased flow rates. These structures can eliminate particulate pollution contained in storm runoff (Williams & Wise, 2006; Ferguson, 1998). Retention ponds are small water retention ponds with a maximum capacity of 10 acres and have at least one outlet and an emergency spillway, as multiple outlets provide better control of stormwater runoff . The main difference between a retention pond and a retention pond is that they are larger and release stored water at a slower rate..