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Several mathematical models are being used for assessing plant response to salinity of the root zone. Objectives of this study included quantifying the yield salinity threshold value of basil plants to irrigation water salinity and investigating the possibilities of using irrigation water salinity instead of saturated extract salinity in the available mathematical models for estimating yield. To achieve the above objectives, an extensive greenhouse experiment was conducted with 13 irrigationdoi:10.1515/intag-2016-0002 fatcat:fgdwkgd6e5gmpj2bybdhbujfci
more »... er salinity levels, namely 1.175 dS m−1 (control treatment) and 1.8 to 10 dS m−1. The result indicated that, among these models, the modified discount model (one of the most famous root water uptake model which is based on statistics) produced more accurate results in simulating the basil yield reduction function using irrigation water salinities. Overall the statistical model of Steppuhn et al. on the modified discount model and the math-empirical model of van Genuchten and Hoffman provided the best results. In general, all of the statistical models produced very similar results and their results were better than math-empirical models. It was also concluded that if enough leaching was present, there was no significant difference between the soil salinity saturated extract models and the models using irrigation water salinity.
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Reuse of treated wastewater is becoming a common source of extra renewable water source in regions and countries with water-scarcity. The expansion of the urban population and the increase in the sewage networks will increase the amount of municipal wastewater. The produced wastewater can become a source of renewable water that can be used for various non-potable reuse, specifically. In the current research study, the newly established Pardis city has been selected as a case study for usingdoi:10.22093/wwj.2021.277964.3125 doaj:f78d4c1e49e649a5a6dfec12f05d854f fatcat:mrl7vasf4jb3jp34qav76bzbsu
more »... cled water (reuse of treated wastewater) for sustainable water resources management. To accomplish the overall objective of the study, Geo-land method for water reuse is employed. For this study the use of regional wastewater facility instead of centralized wastewater treatment facility as well as the related capital cost savings, job opportunities, and environmental benefits were evaluated. Statistical analyses were performed based on multiple factors and classification indicators. The results showed that the highest amount of savings and financial surplus income, 36.17% and 31.25%, respectively, of the overall savings and income as the main priority and recommendation in place of water source will occur in the study area. On the other hand, savings and financial surplus for the group that does not need to use treated wastewater is only for 1.15% of the total study area which stands as the last priority.Results obtained from this study revealed that prioritization of decentralized use of wastewater for urban areas was a highly efficient plan for a significant part of residential areas, while reducing water consumption along with economic savings and increasing regional income happened. The proposed study can also be used as a sustainable water resources management decision-making tool for Pardis city officials.
The reuse of treated wastewater is attractive as a communal source of excess water source in water-scarce counties and nations. The expansion of the urban population and the increase in the coverage of water supply networks and sewage networks will raise the amount of municipal sewage. This can turn into a new-fangled water resource. In the current research, the new campus city was selected as the first case study to design a wastewater reuse and recycling system. Accordingly, one of the mostdoi:10.3390/su132413553 fatcat:cggzn4kmo5gy7ocsakecp7p32y
more »... portant innovations in the proposed research is the unique applied dimensions, in addition to its first-time performance, and the application of the Geo-land method in wastewater recycling as the theoretical dimension of the design. Clustering the decentralized reuse of wastewater for urban areas showed that significant parts of residential areas are located in the first high priority group. Urban planners can consider the results in establishing a comprehensive plan to prioritize the decentralized use of wastewater in the urban area.
The rapid drawdown of the dam reservoir is one of the most common situations occurring in the lifetime of a dam. For this reason, one of the main factors in the design of the upstream slope is the rapid drainage of the reservoir. In this case, the upstream slope is in a critical condition and the slope may be unstable. When the water surface in the reservoir is drawdown suddenly, the water level in the dam body does not decrease at the same time as the reservoir water level. The analysis ofdoi:10.15649/2346075x.1006 fatcat:mix2cgb3h5cffafqc4lud3bkvu
more »... page from the earth dam body and calculation of the water loss play an important role in calculating the amount of pore water pressure, and, consequently, the stability analysis of the dam body. In addition, any seepage analysis is dependent on the hydraulic properties of the dam materials. In order to investigate the effect of hydraulic conductivity on the rapid drawdown of water level and the seepage, an experimental model was constructed of an earth dam. By accurate measurement of hydraulic parameters of the materials in saturated and unsaturated media, the flow through this model was modeled using a disk penetrometer by seep/w software. The results were then compared with the observed data.
The objective of this study was to study the pollution indexes [biochemical oxygen demand (BOD 5 ) and chemical oxygen demand (COD)] variations in domestic wastewater after treatment with agronomical soil. In this experiment, 15 lysimeters were used, 1 to 5 lysimeters were irrigated by domestic wastewater and primary drainage water was accumulated from these lysimeters, 6 to 9 lysimeters were irrigated by primary drainage water and secondary drainage water was accumulated and 10, 11 and 12doi:10.5897/ajmr11.1459 fatcat:bftxp6gnnzcwtkicq53uqabzwu
more »... eters were irrigated by secondary drainage water. In order to compare soil properties, 13, 14 and 15 lysimeters were irrigated by agronomical water. Finally, soil and water properties were measured at the end of irrigation. The results showed that soil could filter the domestic wastewater and reduce pollution indexes of domestic wastewater. Also, irrigation with domestic wastewater increased electrical conductivity (EC), potassium (K), phosphorus (P), calcium (Ca) and magnesium (Mg) of soil. The findings may give applicable advice to commercial farmers and agricultural researchers for management and proper use of water.
Management strategies for sustainable sugarcane production need to deal with the increasing complexity and variability of the whole sugar system. Moreover, they need to accommodate the multiple goals of different industry sectors and the wider community. Traditional disciplinary approaches are unable to provide integrated management solutions, and an approach based on whole systems analysis is essential to bring about beneficial change to industry and the community. The application of thisdoi:10.1080/19942060.2018.1526119 fatcat:bmgwdohp3vcnfeolmrnokooqfa