抄録
This paper shows how to evaluate the flow conditions in droughty and polluted streams in urban area, and also shows how to improve it. The environmental standard of flow (ESOF) is proposed here to give the target for improvement.
ESOF is decided with the scenic and ecological standpoints.
ESOF is compared with the flow without man-made effects (FWMMF), the equilized flow of whole rainfall in basin (EFWRB), the effluent from sewage treatment plants (ESTP), other effluents (EF), intaked water volume in the upstream (IWVU), and observed flow (OF), in order to evaluate the condition of flow and to adopt proper remedial measures.
This evaluating method is applied for 2 streams in Tokyo urban area, and flow of both streams are found to be much smaller than ESOF after the whole urban effluent is taken into sewer pipes.
(1) Flow augmentation from other basins or sewage treatment plants, or
(2) Change of stream's configuration into series of many ponds, is necessary in this case.
