• Journal of environmental and Sanitary engineering
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• v.10 no.3
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• pp.115-123
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• 1995

Most countries have problems regarding the quantity and quality of their fresh water resources, and many countries are suffering from the e(feces of pollution of their inland and coastal waters. Italy is one of the country in which water supply is extremely uneven, and there are wide areas where it represents a real emergencies during periods of drought. All the watershed's water resources, however, are subjected to considerable anthropogenic pressure such as organic load with heavy metals. The high values of organic materials are accounted for mainly by runoff and percolation waste water from urban and agricultural land extensively ma- nured with effluents (rom livestock farming, while high concentration of heavy metals are found in watersheds of national and interregional significance. More than 35% of the underground water bearing strata of certain basins are already contaminated by pollution boih industrial and agricultural pollutants. In these connection, the problems and new measures of water resources in Italy are overviewed.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 1998.10a
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• pp.311-317
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• 1998

Recently irrigation reservoir has been developed to perform multipurpose function. To get a maximum effect it requires to establish optimal management system for irrigation reservoir in drought and flood season. Especially we dealt with optimal flood control system for irrigation reservoir in this study. This system consists of real-time rainfall data via online system, real-time flood forecasted by SCS method in hourly basis, storage volume by water balance equation, optimal releasing discharge from the gate, the water level in right downstream, and calculation of innundated area, depth, and time using GIS, and amount of flood damages. If we consider the relation of these sub module reasonably, we can reach the optimal flood control to minimize flood damage

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2002.10a
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• pp.385-388
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• 2002

We investigated net outflow load and unit load of pollutants from a paddy fields area in dry year 2001. Amount of irrigation water in 2001 was about 61-63% of that in previous years 1999 and 2000 due to drought. The net outflow load and unit load of pollutants in 2001 were negative, showing that paddy fields acts as sink of pollutants due to function of water quality purification. The relationship between unit load of pollutants and net surface outflow (= surface outflow - irrigation water) showed positive correlation. The results showed that abatement of surface outflow by appropriate water management contribute to reduce surface outflow load from paddy fields.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2002.10a
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• pp.97-100
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• 2002

So far, the water management have separately been accomplished by water supply, flood control, and environmental river management. In spite of sustainable policy of water resource development, flood & drought damage, poor water accident, and deterioration of river ecosystem have continuously occurred. It means that it is difficult to improve those problems with the present systems and institutions. So, it is time to discuss to change the present water management system of administrative sense into the one classified by the watershed in order to understand problems of water resource in the regional basis. First, a integration of similar branch office in organization and a work specialization should be driven in the government. Second, it is desirable to develop the water resources according to the inherent characteristics of the watershed.

• Journal of The Korean Society of Grassland and Forage Science
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• v.19 no.2
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• pp.177-182
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• 1999

This research was carried out in a farm situated in Malkara District of Tekirdag Province (Turkey) in 1994-95, and the effect of genotype and environmental conditions on some characters and variations of these characters in terms of silage yield in 8 dent corn varieties were determined. The results of this research showed that leaf weight, stem diameter, and silage yield had a low broad sense heritability while the number of leaves per plant had a high heritability. Yield performance of varieties varied to a significant degree because of variations in rainfall rate during the growing periods. Leaf number, silage yield, leaf weight, stem diameter, plant height and ear weight varied between 13.33-17.33 number, 8,443-11,114 ton/hec, 152.8-244.2 g, 2,615-2,965 cm, 216.5-252.5 g and 176.2-285.8 g, respectively.

• Journal of The Korean Society of Agricultural Engineers
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• v.48 no.2
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• pp.27-35
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• 2006

Large dams are managed with operation standard and flood forecasting systems, while small dams do not have management method generally. Shortage of water resources and natural disasters due to drought and flood raised public concerns for management of small dams. Most of small dams are irrigation dams, which need diversified water uses. However, the lack of systematic management of small dams have caused serious water wastage and increased natural disasters. Storage management method and system were developed to solve these problems in small dams. The system was applied to Seongju dam for effective management. The storage management method was established considering hydrology simulation and statistical analysis using the system. This method can bring additional available water, even in the same conditions of the water demand and the supply conditions of watershed. It can improve the flood control capacity and water utilization efficiency by' the flexible operation of storage space.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.259-262
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• 2003

Surveyed effluent capacities for potential wastewater resources through the surveying of the sewage treatment plants its capacity is up to 10,000 tonnes per day located 4 provinces (kyunggi, gangwon, chungbuk, chungnam) in this year. The total effluent capacities in this provinces are 423 thousand $m^3/day$, which may be used to irrigated paddy fields of 2,310ha A GIS database for wastewater resource inventory was developed for 4 provinces (kyunggi, gangwon, chungbuk, chungnam) to explore the feasibility of the wastewater reuse for drought mitigation. And it is to be extended to the other wastewater treatment plants.

• Magazine of the Korean Society of Agricultural Engineers
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• v.27 no.1
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• pp.71-76
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• 1985

The objectives of this field experiment was to determine and recommend the water requirement for harrow considering the factors of soil class and soil moisture status. Experiment was conducted at the -paddy field of the Office of Rural Development in Chungnam Province. The results of experiment were summarized as follows: 1. Continuous drought day of 10-yr return period in transplanting season was about 25 days and the water content ratios at that point were approximately 20% in clayey-loam soil and 12% in sandy-loam soil irrelevantly to the soil-depth. 2. It was recommended that harrow-water requirement for standard design were approximately 9Omm in clayey-loam soil, 110mm in loamy soil and l3Omm in sandy-loam soil.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 1999.10c
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• pp.105-110
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• 1999

Unused irrigation water due to delievery losses and management losses. and ground water releases from infiltration in the paddy irrigation system are eventually returned to the stream. They are called as irrigation return flow. It affects the discharge of drought flow in the down strenamflow. And it may contain chemicals, and threaten streamflow quality . Thus, the accurage estimation of irrigation return flow is important to the streamflow modeling and water resources planning , and also to the control of agriculutral nonpoint source pollution . The irrigation return flow of pumped water was investigated in the Keum river watershed.

• KCID journal
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• v.18 no.1
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• pp.81-93
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• 2011

Agricultural reservoirs importantly role for paddy rice cultivation with about 18,000 numbers, so that understanding of operational rules for the reservoirs is quite meaningful for proper irrigation water supply. In this study, a survey was conducted to investigate a key reservoir operational elements over nationwide. The target reservoirs are mainly operated by KRC (Korea Rural Community Corporation) and 221 water management persons in province office of KRC were involved in this survey. The key reservoir operational elements including starting and ending time for irrigation, transplanting water supply periods, midsummer drainage periods and drought response strategy were surveyed. The results of this study demonstrated that the key elements for reservoir operation depend on weather, rice variety and cultivation conditions.