Water preservation of irrigation pond

1.香川县灌水池的保护与改造结果可概括为：1)老水库改造工程仍在继续。2)香川县大部分池塘灌溉面积很小。3)环境状况恶化的灌水池分布明显。4)在规划灌水池保护与改进的情况下，为了解决维护问题，有必要根据土地利用规划进行池塘加固。香川县灌溉水库水质在香川县，长期以来，许多灌溉水库都是为农业用水而修建的。近几年来，灌区水库水质很差。例如，低水质的损害可以在温室里看到。微灌系统中存在堵塞现象。因此，灌溉水库水质不佳是一个严重的问题。首先，水与…的关系对沿江灌溉水库的水质和水位进行了较详细的检测。其次，对水库集水区人口与水质的关系进行了检验。结果表明，生活排水对水库水质不佳起到了重要作用。水质保护的实验研究混合水质的初步测试：利用位于实验房间内的一个小水箱，对从灌溉池塘中提取的水进行了初步测试。然后用螺丝将水混合，并暴露在水面上的空气中。以溶解氧(DO)作为质量评价指标。混合后，DO随着时间的推移而增加。比起螺杆搅拌器，注入管可以高效地增加溶解氧。灌溉池塘的保鲜试验：池塘的水质很脏，低于种植水稻的标准值。虽然随着时间的推移，水质通过保鲜设备的操作得到了一点净化，但效果相当有限，这是由于从底部卷曲造成的。较少

1. Conservation and improvement of irrigation pond in Kagawa PrefectureThe results may be sumarized as follows :1) Old reservoir rehabilitation project is continual.2) The greater part of pond-fed irrigation area in Kagawa Pref.is very small.3) It becomes clear that the distribution of irrigation pond which environmental situation get worse.4) In the case of planning of irrigation pond conservation and improvement for the sake of solution of the maintenance problem, It is necessary to consolidate pond according to the land use plan.2. Water quality in irrigation reservoir of Kagawa PrefectureIn kagawa prefecture, from a long time ago, many irrigation reservoir were constructed for agricultural water use. Recently the water quality in irrigation reservoirs are very low. The damage of low water quality can be seen in for example green house. The clogging is occurred in microirrigation system. So low water quality in irrigation reservoir is serious problem. Firstly, the relation of water … More quality and ground level of irrigation reservoir along the river were examine. Secondly the relation of population in catchment area of reservoir and water quality were checked. The results indicated that domestic drainage water play a important role in low quality water of reservoir.3. An experimental study of water quality preservationElementary test of water quality by mixing : An elementary test of water extracted from an irrigation pond was conducted using a small tank located in experimental room. Then the water was mixed by a screw and exposed to the air at the surface of water. Dissolved oxygen (DO) was ued as an index for the quality evaluation. DO increased as the time elapsed after mixing. An injection pipe was highly efficient for increasing DO,rather than screw mixer.Preservation test at an irrigation pond : The water quality of the pond was dirty, which was lower than a standard value for growing rice. Although water quality as time elapsed was purified a little by the operation of a preservation apparatus, the effect was quite limited, caused by curled up from the bottom. Less