Evaluation of Water Resources Supply at Water Shortage from Suburban Forests

本文在每日供水记录的基础上，对1992 ~ 1997年爱知县濑户市的供水情况进行了分析。濑户市的供水分为市政供水和县供水两部分。在这里，县水来自木索河通过爱知水道。1994年东海区缺水时，市政用水下降到正常水平的一半。但各县供水量填补短缺，特别是总供水量短缺，缺水的后半段，在9月，发生在相对强降雨导致市政用水增加的情况下。长期缺水后，总供水量持续偏低。造成这种情况的原因是基索河流域恢复蓄水的工作拖延，以及人们对缺水情况的适应。与东京大学爱知县大学森林的森林恢复相对应，径流量增加。这与其他森林水文实验的各种报告相反。作者试图在这篇报道中解释这些现象。应该坚持认为，在某些特殊情况下，森林恢复可以增加径流量。加强城市供水的可能性总结如下。(1)水源区仍有足够的开发空间，可以向濑户市供水。(2)城郊森林容易成为城市垃圾的沉降空间，考虑到城市垃圾的空间分布和水质退化，需要进行精心规划，以获得更大的供水空间。作者还进行了研究，以了解源头地区人们对1)用水状况和2)市政管理需求的看法。除了市政源头地区，他们还在基索河源头地区进行了同样的研究，那里的人们因水坝的建设而失去了栖息地。少

An analysis of water supply from 1992 to 1997 in Seto City, Aichi Prefecture was conducted on the basis of daily record on water supply. Water supply in Seto City is divided into two parts : municipal water and prefectural water. Here, prefectural water comes from the Kiso River through Aichi waterway. At the water shortage in Tokai District in 1994, municipal water decreased into a half of ordinary level. However the prefectural water distribution filled the shortage, the total water supply was in short in particular, the latter half of water shortage, in September, occurred in the situation of municipal water increase caused by comparative heavy rain. For a long time after scanty water, low level of total water supply continued. This is attributed to a delay of restoration of water storage in the Kiso River Watershed and to adaptation of people to the situation of water shortage.Corresponding to the forest restoration in University Forest in Aichi, the University of Tokyo, runoff is … More recognized to increase. This is against to various reports from other experiments of forest hydrology. The authors tried to explain the phenomena in this report. It should be insisted that forest restoration can increase runoff in some special case.Possibility of enhancement of municipal water supply was concluded as follows. 1) There remains enough space to develop the headwater area to afford water supply to Seto City. 2) The suburban forest is apt to be utilized as space for deposition of urban waste, so deliberate planning is needed to get more space for water supply in considering spatial distribution of urban waste deposition and water quality degradation.The authors also conducted the research to pick up the thinking of people in headwater areas concerning 1) the situation of water usage and 2) need for the municipal administration. As well as municipal headwater area, they conducted the same research in the headwater area of the Kiso River where people lost the habitat by construction of Dams. Less