Characterization of Malir River Basin for Management of Water Resource Using Geo-lnformatics

摘要

The Topographical techniques play a vital role in quantitative description of geometry of basin and drainage network, which help in characterizing the drainage network. Especially the topographical characteristics that affect the drainage network as well as surface runoff. In this paper, Malir watershed was examined at the elevation range between 98-622 meters above mean sea level with an area of1246 km2. The longest stream is 105 km which is Mol River. Mol's basin length is 81 km and the perimeter of the catchment is 294 km2. The Malir watershed area is divided in to five elevation zones and the maximum area was delineated under (73%) lies in the elevation range of201- 400 meters above mean average sea level (masl). Mol stream flows for 80 kilometers length from height of 610 meters and Khadejiflows from 310 meters height and an about 50 kilometes length. Malir watershed area is divided in to seventeen grid codes, the twelve sub-watersheds in 636 km2 andfive sub-watersheds in 611 km2 under the Khadeji and Mol streams respectively, and 0.007 average stream slopes was calculated. However, both streams are very important and servicing almost equal area of the watershed. The circularity ratio (C) and Lemniscate s ratio (k) shows that drainage basin is not a complete circle.