沖縄県宮古島皆福地下ダムにおける取水施設の水理学的考察
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概要
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The discharge of groundwater from the catchment facility of Minafuku underground dam in Miyako island, Okinawa Prefecture, was calculated by solving the Sugio's equations and Manning's equation. The availability of the Sugio's equations in this case was proved by calculating the permiability of the Ryukyu limestone nearby the facility on the basis of the data of the 4th pumping test in this dam. The permiability which we calculated equals to 0.25 cm/s and it is good accordance with that of ordinary Ryukyu limestone. The Manning's coefficient of the pipe in the catchment facility was calculated on the basis of the same data. The coefficient which we have gotten equals to 0.032 and it is extremely larger than that of the other ordinary steel pipe. When H_0 (initial groundwater depth) and dH (drow-down of the groundwater level) are given, we can estimate the discharge of groundwater from the catchment facility of this dam by the use of Figure 5 in this report.
- 1983-03-30