摘要：Background and Objective: Watershed is an area of land that comprises a set of watercourses and rivers that all drain into a single larger water body (River). Watersheds are important since the surface water and storm water runoff within a watershed eventually drain to other bodies of water. During increasing and executing water quality protection and restoration actions, it is needed to consider these downstream impacts. The present study was conducted to explore the available major water sources of the Halda river. Materials and Methods: Data were collected through extensive field survey and structured questionnaire survey from November, 2011-September, 2012. Data were analyzed by one-way analysis of variance (ANOVA) using SPSS. Results: A total of 34 watersheds of the Halda river were recorded. Out of them major seven watershed areas namely: Manikchari Khal, Dhurang Khal, Sattar Khal, Fatikchari Khal, Harualchari Khal, Baromasi Khal, Mondakini Khal were selected for the study. The mean width of the above mentioned Khals were 33.75, 37, 51.5, 19.5, 15, 12.5 and 19 m, respectively. The mean depth of these khals were 5.75, 8.5, 10.5, 5.5, 7, 4 and 6 m, respectively and the approximate length of these khals were about 25, 56, 45, 28, 19, 17 and 18 km, respectively. Noteworthy difference was found among the watersheds in terms of mean depth, mean width and mean length (p<0.05). Conclusion: Discharged water of the watershed directly covers a large area through different khals of the river, indispensable resource for aquatic organisms and human being. Therefore, it is essential to conserve these watershed areas from haphazard pollution for sustainable ecosystem health management and meaningful development of the country.
