Mapping and GIS Analysis of Small Water Reservoirs in the Hills of the Halda River Watershed

Author: Shubha Sarker, Razat Suvra Das, Sayedur Rahman Chowdhury, M. Shahadat Hossain, Milan Kumar Shiuli
DOI: doi.org/10.70279/bmj-v4-i1-1002
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The aim of this research is to the discovery of small water reservoirs in the Halda river watershed, analysing their geometric and geographic parameters like area, neighbourhood distance, elevation wise distribution, tortuosity, perimeter and also mapping these small water reservoirs. Through this research work, a total of 593 reservoirs is identified and mapped. The total area of those reservoirs is 6,124,117 m2 (6.12 km2 ) which cover almost 0.36% of total Halda watershed area and 0.56% of upland (>20 m elevation) area. The average area of these reservoirs found around 10327 m2 . The minimum and maximum area of these small reservoirs found around 180 m2 and 115007 m2 respectively. The neighbourhood distance also calculated. The highest occurring distance among reservoirs is around 830 m. The maximum and minimum distance is around 3391 and 44 m respectively. The total number of the neighbourhood is found 1595 under 3400 m cut off distance. The average elevation is found 30.74 m. Elevation wise distribution shows that most of the reservoirs are located in the hill tracts of Halda river watershed which commonly known as upland area. Tortuosity of reservoirs is calculated. From the descriptive statistics, the average tortuosity of studied reservoirs is around 7. Most of the small reservoirs have 250 m to 500 m perimeters. Their average perimeter is calculated as 696.17 m. For the first time, the reservoir map and their relative neighbourhood graph of Halda river watershed are generated through this research.