A STUDY ON THE EFFECTS OF DIFFERENCE FROM RAINFALL PATTERN ON RUNOFF PHENOMENON IN TONE UPPER RIVER BASIN

Abstract

 To clarify the effects of difference from rainfall pattern on runoff phenomenon contributes to the further development of the integrated flood control measures by the combination of various conventional flood control methods. Elucidating those effects is very useful to examine flood control plan. In this study, authors made pseudo rainfall patterns based on Typhoon Kathleen in September 1947 in Tone upper river basin and examined the effects of difference from rainfall pattern we created on runoff phenomenon. In consequence, it was indicated that peak discharge at Yattajima point of observation fluctuated from 19000 m³/s to 27000 m³/s depending on rainfall pattern. Furthermore, it was indicated that peak discharge at that point exceeds design flood discharge depending on rainfall pattern.