Evaluation of Water Resources Supply at Water Shortage from Suburban Forests

根据日供水量记录，对爱知县濑户市1992 ~ 1997年的供水量进行了分析。濑户市的供水分为市用水和县用水两部分。在这里，县水来自木曾川通过爱知水道。1994年东海地区缺水时，市政用水量减少到正常水平的一半。但各县配水补不足，特别是总供水量不足，下半年缺水，9月份出现了因暴雨较大而造成的市政用水增加的情况。长期缺水后，低水平供水总量持续。这是由于木曾川流域的蓄水恢复滞后和人们对缺水状况的适应，与东京大学爱知大学森林的森林恢复相对应， 关于我们 认识到要提高。这与其他森林水文学实验的各种报道相矛盾。作者试图在本报告中解释这些现象。在某些特殊情况下，森林恢复可以增加径流量。1)为了向濑户市供水，仍有足够的空间开发水源区。2)郊区森林容易成为城市废弃物的沉积空间，因此，在考虑城市废弃物沉积空间分布和水质恶化的情况下，需要仔细规划，以获得更多的供水空间。作者还进行了研究，以唤起水源地人们对1）用水情况和2）市政管理需要的思考。除了城市水源区，他们还在木曾河的水源区进行了同样的研究，在那里，人们因建造水坝而失去了栖息地。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