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Govindra Seksaria Institute of Technology and Science. Over the two monsoons, detailed studies were undertaken on three catchments: two were included in the Indore Slum Improvement Programme, incorporating innovative design, while the third reflected conventional local drainage practice. This chapter describes work done in the conventional catchment, Pardeshipura. |
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Pardeshipura is a flat, medium density, heterogeneous development of residential and business properties in the northeast of the city. Within Pardeshipura, a 17-ha study area was selected which drains to a single major outlet. The study area (Figure 14.1) contains about 5000 inhabitants, who are classed within the middle-income group, although pockets of the area may be classified as slums. Runoff in the catchment drains to a 585 m long concrete-lined open channel, which also carries sewage. The outlet discharges freely under most conditions, simplifying baseline hydraulic measurement and analysis. |
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The main drain's nearly rectangular cross-section varies from approximately 0.9 m deep and 0.6 m wide at the outlet to approximately 0.5 m deep and 0.4 m wide at the upstream end. The overall slope is approximately 0.003, but varies irregularly along the channel. Single or parallel pipes carry flow beneath intersections, and often act as partially blocked obstructions. While one major tributary parallel to the main drain was also modelled, the other tributary drains in the catchment are small, irregular and hydraulically inefficient. These secondary tributaries were observed to reach maximum capacity rapidly during even the smallest storm events, resulting in flooding of the adjacent streets. The overflow in these streets was therefore modelled as flow in wide, shallow, V-shaped channels. |
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Exact boundaries of the catchment were difficult to determine. The large flat area of the catchment was one problem, as small variations in topography have a disproportionate influence on tributary area. Secondly, the tributary area actually varied during heavy storms when the drainage capacity of adjacent catchments was exceeded. Under these circumstances, runoff would overflow into the study area across tributary boundaries. By the same |
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