Alireza Tabatabaei Naeini - Civil Engineer (M.Sc) Zayandab Consulting Engineers Co.

The types of major drainage channels available to the designer are numerous, depending upon good hydraulic practice, environmental impacts and design, sociological impact, permitting limitations, and basic project requirements. However, from a practical standpoint, it is useful to identify general types of channels that can be used by the designer as starting points in the design process. In this study describes in detail the following types of channels that can serve as major drainage channels in urban areas: • Natural channels • Grass-lined channels • Composite channels • Concrete-lined channels • Riprap-lined channels • Bioengineered channels • Channels with a form of manufactured liners Selection of the channel type for any given reach of a major drainageway is a complex function of hydraulic, hydrologic, structural, financial, environmental, sociological, public safety, and maintenance considerations and constraints. This Study addresses the major topics related to major drainage design, beginning with essential background on the issues of major drainage planning and engineering and fluvial geomorphology. The next Section contains specific design criteria for a variety of channel types and includes typical cross sections, and other representative design details.

Stream Channels; Major Drainage Channel; Urbanization; Hydraulic