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Research Article |

Stone Quarries and Hydrological Regime of Roshi with Emphasis on Sedimentation

Nepal is a country with many mountains, situated in Hindukush Himalayas. Stone quarrying is currently accompanying the rapid expansion of physical infrastructure in the Roshi River and its tributaries. This study aims to establish the discharge and suspended sediment rating curve of the Roshi River. It also includes the impact of the stone quarries in the Roshi River during operation and non-operation at the upper Roshi watershed, Nepal. The data includes stage data, measurement of discharge, and suspended sediment in the years 2022 and 2023. The regression analysis was conducted with the development of a discharge rating curve having a coefficient of determination R2 = 0.83. The suspended sediment rating curve of the annual and monsoon, of the year 2022 was developed with a coefficient of determination of 0.23 and 0.39 respectively. The average suspended sediment concentration at tributary Roshi is 203.04 percent higher than at upstream. The increase in average suspended sediment concentration at main Roshi concerning tributary Roshi is 14.25 percent. Further, the decrease in average suspended sediment concentration due to the non-operation of the stone quarry in January 2023 concerning December 2022 is 52.13 percent in tributary Roshi and 12.59 percent in the main Roshi River. Furthermore, the increase in SSC during the operation of stone quarry including monsoon contribution is 682.97 percent higher than during non-operation. The increase in SSC during the operation of stone quarry excluding monsoon contribution is 64.34 percent higher than during non-operation. The study will facilitate Panauti hydropower and the concerned authorities of Panauti to adopt various measures to control sediment discharge from stone quarries at Roshi for sustainable development of the Roshi watershed.

Discharge, Stage, Stone Quarry, Suspended Sediment Rating Curve

APA Style

Suman Shrestha, Prachand Man Pradhan, Hari Krishna Shrestha. (2023). Stone Quarries and Hydrological Regime of Roshi with Emphasis on Sedimentation. American Journal of Water Science and Engineering, 9(4), 86-96.

ACS Style

Suman Shrestha; Prachand Man Pradhan; Hari Krishna Shrestha. Stone Quarries and Hydrological Regime of Roshi with Emphasis on Sedimentation. Am. J. Water Sci. Eng. 2023, 9(4), 86-96. doi: 10.11648/j.ajwse.20230904.11

AMA Style

Suman Shrestha, Prachand Man Pradhan, Hari Krishna Shrestha. Stone Quarries and Hydrological Regime of Roshi with Emphasis on Sedimentation. Am J Water Sci Eng. 2023;9(4):86-96. doi: 10.11648/j.ajwse.20230904.11

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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