Comparative analysis of the cumulative yield from the adjacent catchment along the ancient Minipe Left Bank Canal, Sri Lanka

Ganila N. Paranavithana, Rashmi N. J. K. Arachchi, Upaka Rathnayake

Article ID: 2165
Vol 7, Issue 3, 2023

VIEWS - 130 (Abstract) 82 (PDF)

Abstract


Ancient Minipe Anicut, Sri Lanka is world-famous for its engineering excellence. Due to its importance, conserving the ancient anicut, another anicut was constructed downstream in the 20th century. Nevertheless, the water diverted from the ancient anicut to the Minipe Left Bank (LB) Canal was kept as it was due to inherited agricultural importance. This research focuses on studying the contributions made by the adjacent catchment along the Minipe LB Canal. There are several level crossings along the Minipe Left Bank Canal from which the runoff of the local catchment flow into the Minipe LB Canal. Hydrologic Modeling System (HEC-HMS) is used to obtain the yield from each catchment into the Canal, which was compared with the annual diversions from Minipe anicut. The total yield from each stream has been compared with the annual diversion of the Minipe LB Canal from 2014 to 2020. The results obtained from this study reveal that there is sufficient water available for water augmentation in the basin, with an estimated annual average cumulative yield from the catchment of 453.6 MCM. This cumulative yield is 1.7 times the annual average diversion from the Mahaweli River, which is 271.9 MCM. With the findings, it is concluded that there is a potential to augment water from the catchment to address pertaining water shortages conveyance in the command area.


Keywords


ancient Minipe Anicut; digital elevation model; GIS; HEC-HMS; Minipe Left Bank Canal; runoff modeling

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DOI: https://doi.org/10.24294/jipd.v7i3.2165

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