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Abstract

This paper aims to analyse the flood discharge based on the Synthetic Unit Hydrograph (SUH), using the Soil Conservation Service method (SCS), the SUH of Nakayasu method, and the SUH of Gama I method. Modelling formed the basis of the research conducted on the Bengawan Solo River, Indonesia. The embankment construction on the Dengkeng–Pusur Section was designed as a method of flood control in 1988. The problem was that around its location are densely populated cities, industrial areas, and agricultural areas. In order to measure the risk of embankment failure and water structure planning in general, it is necessary to analyse the maximum flood discharge. There are several methods for analysing maximum flood discharge, so finding a suitable method is essential due to the lack of measuring tools to calculate flood discharge in some areas. The calculation is compared with the observation data at the Serenan AWLR station, which is in the Dengkeng–Pusur section. The observation rainfall data was covered a 20 year period (1999–2018). According to the method used, the analysis is based on series data on four rainfall stations, the watershed characteristics, and other parameters. Furthermore, the maximum flood discharge from the calculation is compared with the observational data at the Serenan station. The result shows that the best SUH is Gama I method compared to the observation maximum flood discharge in AWLR Serenan Station, with an 8.0% error. The other method, the SUH Nakayasu method with a 16.6% error, and the SUH SCS method with a 39.5% error.
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Authors and Affiliations

Nova D. Sirait
1
Sobriyah
1
Rintis Hadiani
1
Cahyono Ikhsan
1

  1. Sebelas Maret University, Faculty of Engineering, Ir. Sutami Street 36A, Solo, 57126, Center of Java, Indonesia
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Abstract

The article focuses on the problem of structure degradation and ecosystem functioning – the urgency that identifies the relevance of operations at a strategic level aimed at providing the integrated assessment of ecological stability of water. Determination of water quality indicators were divided into blocks according to the criteria of salt composition, according to chemical saprobological indicators and the content of specific substances of toxic and radiation action. According to the results of block analysis, the integrated ecological index of water quality was determined by the dependence of water quali-ty on the indicators of ecological stabilization of the landscape and the structure of biotechnical elements. The article de-termines the relationships between worsening quality of surface waters and stabilization or destabilization of the landscape structure. The research was conducted on medium and large streamflows on the Right Bank of Polesie region of the Dnie-per-River cascade within which the tracts of land were identified and the landscape ecological stability (CESL1) and land-scape biotechnical elements coefficients (CESL2) were determined. The retrospective analysis was performed of the sur-face water features on the Right Bank of Polesie region of the Dnieper- River cascade and the main trends in salt block in-dicators, trophic and saprobiological block indicators, and in the content of toxic and radioactive substances at observation sites were estimated. Based on obtained data, the integrated assessment in trends of surface water quality on the Right Bank of Polesie region of the Dnieper- River cascade was made and the main parameters and scale of stabilization and destabili-zation of landscape impact on the water quality formation were defined.

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Authors and Affiliations

Tetyana P. Fedoniuk
Roman H. Fedoniuk
Ludmila D. Romanchuk
Anatolyy A. Petruk
Viktor M. Pazych

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