20-09-2017, 02:39 PM
A scientific drainage system to catch water from storms is a long-term ambition of society, especially in cities. The increase in development activities has wrongly called for the need to discharge runoff safely into the environment. It is often occurring that over-densification and modification of underdeveloped lands is also leading to increased flow with increased pollution. Regardless of the city, most of the face of our city will fracture, if a strong storm with high runoff is struck, due to inadequate drainage facilities. Most existing storm drains are in deteriorated stages and do not function properly, they lose self-cleaning, do not require proper maintenance and an incorrect design without any scientific basis, bottlenecks go like this. Proper rainwater design means adequate knowledge of a data collection such as understanding rainfall data clearly, knowing the infiltration rates, concentration time, rainfall intensity, runoff details, etc.
One of the most important factors in the design of sustainable rainwater drainage systems is the physical volume of storage that needs to be provided to achieve flood control and minimize the pollution impact of urban storm water runoff. This section on stormwater drainage begins by examining the performance of current drainage systems and the conditions that lead to flooding and poor water quality. More information on the management of inflow and infiltration can be found in the Regional Policy for Drainage, Infiltration and Exfiltration. Design and evaluation criteria for sewers, rivers and SuDS measures are proposed along with the design principles and procedures for estimating the volumes of individual SuDS facilities. Appendix E provides an illustration of the approach to assessing rainwater storage requirements. It is important to realize that all drainage systems are designed for a set of criteria that are subject to economic, social and environmental constraints. It is not feasible to design for all circumstances and there will always be cases where extreme events will exceed design criteria. Therefore, the design process must be one of risk management, so that the consequences of events larger than the design event are evaluated by their cost and environmental impacts.
One of the most important factors in the design of sustainable rainwater drainage systems is the physical volume of storage that needs to be provided to achieve flood control and minimize the pollution impact of urban storm water runoff. This section on stormwater drainage begins by examining the performance of current drainage systems and the conditions that lead to flooding and poor water quality. More information on the management of inflow and infiltration can be found in the Regional Policy for Drainage, Infiltration and Exfiltration. Design and evaluation criteria for sewers, rivers and SuDS measures are proposed along with the design principles and procedures for estimating the volumes of individual SuDS facilities. Appendix E provides an illustration of the approach to assessing rainwater storage requirements. It is important to realize that all drainage systems are designed for a set of criteria that are subject to economic, social and environmental constraints. It is not feasible to design for all circumstances and there will always be cases where extreme events will exceed design criteria. Therefore, the design process must be one of risk management, so that the consequences of events larger than the design event are evaluated by their cost and environmental impacts.