Assessment of agricultural watershed water budget considering upstream water budget against reservoir discharge and agricultural water supply

Seokhyeon Kim, Soonho Hwang, Hyunji Lee and Moon Seong Kang

Agricultural Water Management, 2025, vol. 316, issue C

Abstract: This study proposes a watershed baseflow and direct runoff assessment methodology considering agricultural reservoirs, consisting of an assessment method that reflects the upstream water budget in the reservoir water balance and a watershed analysis using a linked modeling technique. The linked model integrates the watershed model with the reservoir operation model, allowing for the estimation of watershed runoff, agricultural water supply, reservoir discharge, and irrigation return water. It was calibrated and verified to ensure result applicability beyond "Satisfactory." The assessment method considering the reservoir separates the inflow into direct outflow and baseflow, analyzed the reservoir water balance for both, and reflects them in the outflow (discharge, supply). This approach enables the assessment of temporal variations in inflow, storage, discharge, and agricultural water use. The monthly BFI in the reservoir storage, it gradually decreased during the flood season and subsequently increased. This was reflected in the discharge assessment, allowing us to reflect the reservoir condition at each time. The resulting average watershed baseflow index was 69.0 %, 1.5 % higher than the value without reservoir consideration. This study is significant in integrating upstream watershed hydrology and reservoir operations into overall watershed assessment. By evaluating the impacts of reservoirs and agricultural water use on watershed conditions, it supports the development of management frameworks such as evaluating watershed unit improvements and formulating reservoir operation strategies to enhance watershed water cycles.

Keywords: Agricultural reservoir; Direct runoff; Baseflow; Watershed-reservoir linkage model (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0378377425003014
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:316:y:2025:i:c:s0378377425003014

DOI: 10.1016/j.agwat.2025.109587

Access Statistics for this article

Agricultural Water Management is currently edited by B.E. Clothier, W. Dierickx, J. Oster and D. Wichelns

More articles in Agricultural Water Management from Elsevier
Bibliographic data for series maintained by Catherine Liu ().