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Hydrology: Current Research

ISSN: 2157-7587

Open Access

Articles in press and Articles in process

    Research Article Pages: 1 - 5

    Analysis of Evapotranspiration and Developing Crop Coefficient for Plantation Sugarcane Using Lysimeter Experiment under Melkassa Climatic Conditions, Ethiopia

    Belay Yadeta*, Mekonen Ayana, Muluneh Yitayew and Tilahun Hordofa

    Sugarcane is one of the important industrial crops produced all over the tropical areas. Sugarcane production is highly expanding in developing countries like Ethiopia. However, sugarcane is characterized by very high crop evapotranspiration. This requires determination of its crop evapotranspiration to apply with accurate crop water requirement throughout the growth period. The main purpose of the current study was to determine sugarcane evapotranspiration and develop its crop coefficient using Lysimeter experiment. Weather parameters required for CROPWAT 8.0 model used to determine reference evapotranspiration were collected during the study time. The sugarcane evapotranspiration was computed throughout the growing period of the crop from lysimeter experiment. The result indicated that crop evapotranspiration obtained ranges from 1.63 to 7.13mm/ day. The study found that sugarcane crop coefficients were 0.42, 0.93, 1.26 and 1.05 at emergence, tillering, grand formation and ripening growth stages respectively. The variation of sugarcane crop coefficient obtained were 2%, 1% and 30% greater than FAO recommendation at emergence, grand formation and ripening growth stages respectively but 33% lower at Tillering growth stage. Therefore, from the findings so far it can be concluded that these crop coefficient values can be used in the sugarcane estates until further improvements are made.

      Research Article Pages: 1 - 7

      Assessment of Drinking Water Treatment, Disinfection and Disinfection by Products

      Dessalegn Geleta Ebsa* and Wakjira Takala Dibaba

      Disinfection By-Products (DBPs) have heterogeneous structures, which are suspected carcinogens as a result of reactions between Natural Organic Matter and oxidants/disinfectants such as chlorine. Because of variability in DBPs characteristics, eliminate completely from drinking water by single technique is impossible and it have been considered as toxic contaminants of water. Disinfection By-product is another problem available in water supply treatment in the distribution system. The objective of this study was evaluating the performance of Jimma town water distribution networks of water treatment plant. Hence, the study was addressed, efficiency of conventional water treatment plant unit, chlorination and disinfection and disinfection by-product. To evaluate the water treatment plant simulation WatPro v4, tool was applied for disinfection and treatment plant performance. As per the discussion held with the Jimma water supply and sewerage authority and field visit, the major factors of water loss were identified. As per the calculation result, the treatment plant efficiency of the town was estimated as 69.75%. In case of giardia and viruses reduction (22.6% and 75.34%), that was the results obtained from the treatment plant simulation did not obey the surface water treatment rule. Despite its small amount, disinfection by products has been found in the town’s water treatment plant. As per the calculation obtained; the contact time of the water system did not meet the contact time requirement because 0.476<1. In general, the current water distribution network and treatment plant of Jimma town were in poor performance and were not conducted adequate water to the various demand categories of the town. Hence, it is important to rehabilitate and the treatment plant of the town in order to fulfill the required need.

        Research Article Pages: 1 - 5

        Experimental Study of Rainfall-Runoff Process under a Calibrated Rainfall Simulator

        Yahaya Olotu, O. O. Olanrewaju, A. A. Rodiya and P. A. Adekunle

        The relationship between rainfall-runoff is a complex hydrological process that requires technical-based approaches to investigate and understand the interaction of the hydrological variables. A calibrated rainfall simulator was developed to produce storms at seven (7) predetermined Rainfall Intensities (RIs) over two (2) Runoff Plots (RP). The Runoff Plot (RPA) is 0.72 m2 and RPB is 0.5 m2 was each inserted 0.3 m into the bare sandy loam. The results of the experimentation showed the first Rainfall Simulation Attempt (RSA) of RI value of 10.8 mm/hr was totally lost to infiltration without generation of surface runoff from the two runoff catchment plots. Subsequently, the RSA generated varying Surface Runoff Intensities (SRI) and with RPB producing higher SRI and volume compared to large catchment plots (RPA). Conversely, the relationship of rainfall-runoff showed co-linearity between the simulated rainfall and generated surface flow RPA and RPB with the determinant of coefficients of 0.9926 and 0.9942 at P<0.05. Therefore, the study’s finding is useful to develop a rainfall-runoff model under different runoff catchment areas for constructing Integrated Water Management Schemes (IWMS), hydraulic structures, and irrigation scheduling.

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Citations: 1731

Hydrology: Current Research received 1731 citations as per Google Scholar report

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