source controls, re-vegetation programs of disturbed land, and minimal bare soil in urban gardens (especially those on sloping land) are some of the non-structural measures (http://eau.sagepub.com/content/15/2/115) The stormwater drainage network represents a large capital investment and hence due consideration should be given to its design, management and maintenance. To achieve the best practice in the design and whole-life cycle management of stormwater infrastructure requires the adoption of appropriate design standards dealing with major and minor storms, and the encouragement of practices to extend the retention time in the storm water systems. (Sunil 2000) 2.5 URBAN STORMWATER DRAINAGE DESIGN. 2.5.1 INTRODUCTION. Urban storm drainage can be defined as the control of floods in urban environments. The main purpose of storm water drainage is to collect and convey stormwater to receiving waters with safety and minimal damage. However, recently the focus is slowly shifting from disposal of storm water towards the total management of storm water considering it as a water resource. The main components of urban drainage systems are: Roof and property drainage Street drainage (including both piped and surface flows) Trunk drainage Receiving water bodies (including ground water storage). (UNCHS report 1991) 2.5.1.1 Aims of storm water drainage systems. The main aim of stormwater drainage systems is to collect and convey stormwater to receiving bodies with safety and minimal damage. Other objectives include;
source controls, re-vegetation programs of disturbed land, and minimal bare soil in urban gardens (especially those on sloping land) are some of the non-structural measures (http://eau.sagepub.com/content/15/2/115) The stormwater drainage network represents a large capital investment and hence due consideration should be given to its design, management and maintenance. To achieve the best practice in the design and whole-life cycle management of stormwater infrastructure requires the adoption of appropriate design standards dealing with major and minor storms, and the encouragement of practices to extend the retention time in the storm water systems. (Sunil 2000) 2.5 URBAN STORMWATER DRAINAGE DESIGN. 2.5.1 INTRODUCTION. Urban storm drainage can be defined as the control of floods in urban environments. The main purpose of storm water drainage is to collect and convey stormwater to receiving waters with safety and minimal damage. However, recently the focus is slowly shifting from disposal of storm water towards the total management of storm water considering it as a water resource. The main components of urban drainage systems are: Roof and property drainage Street drainage (including both piped and surface flows) Trunk drainage Receiving water bodies (including ground water storage). (UNCHS report 1991) 2.5.1.1 Aims of storm water drainage systems. The main aim of stormwater drainage systems is to collect and convey stormwater to receiving bodies with safety and minimal damage. Other objectives include;
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