Organization of The Seminar

Chapter I : Describes Urban Hydrology, The Scope of Urban Hydrology, Objectives and Scope of Study, and Organization of The Seminar.

Chapter II : Gives details about Desk-top Methods for Urban Drainage Design; The Rational Method for Surface Drainage, Kinematic Time of Concentration Formulas, The Kinematic Rational Method and Storm Sewer Design by The Rational Method.

Chapter III : Explains about Storm Water Management Model-software; Introduction and SWMM’S Conceptual Model.

Chapter IV : Explains about SWMM Application to Urban Drainage Planning; Example Study Area Map, Explanation of Input Data and Output.

Chapter V : Summary & Conclusion.

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Objectives and Scope of Study

1. To understand the issues involved in the planning of urban drainage.

2. To understand basic theory of an operational model, and related software (Storm Water Management Model) for its potential use in simulation of an existing drainage system and in planning of a new drainage system.

3. To understand how to use SWMM software (input data as per requirement) and applied an various illustrative examples.

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Urban Drainage Planning

Synopsis of My Seminar: URBAN DRAINAGE PLANNING

The rainfall-runoff process in an undeveloped area is primarily determined by the natural surface detention, infiltration characteristics, and the drainage pattern formed by the natural flow paths. The type of the surface soil, the nature of vegetative cover, and the topography are the governing factors. The natural rainfall-runoff process is altered in urbanizing areas. Part of the land surface is covered by impervious material due to urbanization. The water courses are cleared, deepened, and straightened to improve their conveyance capacities.

New man-made drainage facilities are added to the drainage system. A typical urban land cover consisting of impervious rooftops, streets, and parking lots allows far less surface retention and infiltration than an undeveloped land. Moreover, stormwater runoff occurs over smooth, impervious surfaces, and in man-made or improved natural channels with increased velocity. As a result of these factors, urbanization increases the stormwater runoff volumes and rates, and possibly causes flooding of downstream areas. It can also accentuate downstream channel erosion.

In response to these critical problems, engineers and scientists have developed many innovative techniques to analyze urban hydrology. They have also designed many innovative structures to control urban flooding and improve stormwater quality. These analysis techniques and design structures rely heavily on numerical methods and computer models. Thus, desktop methods and empirical models are giving way to new, physically based techniques that are embedded in modern computer software.

Storm Water Management Model (SWMM) is a rainfall runoff simulation model which can be used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. Computer based Storm Water Management Model (SWMM) can be used in several practical applications. This study provides an understanding of urban hydrology, i.e. how to plan urban drainage. The latest version of SWMM 5 software developed by US EPA has been studied and applied an various illustrative examples.

Posted by: JRP