Abstract
The Writer studied the groundwater hydrology of Kinokawa valley in Waka-yarna prefecture with relation to its surface water.
Kinokawa valley is formed in the metamorphic rocks of “Mikabu groups” along “Median Line” and is filled up from lower to upper reaches by gravel with clay of “Kinokawa series” or “Shdbutani series” of plio-pleistcene (Dil), alluvial sand and gravel (Al1) in upper valley above Iwade and the newest gravel (A12) in lower valley below Iwade.
From the groundwater contour map obtained from 210 well's observation, it is evident that the groundwater of this valley gathers into the alluvial flood plain from both sides of the valley and flows without escapement to other places.
At several point of this valley, the geology of the cross section was determined by means of electrical reF istivity method and its cross sectional area was calculated. The apparent velosity of the grouadwater procured from Thiem's methods was taken in many places of the vuIley. (Tab. 1, Tab. 2)
Thus he evaluted the amount of groundwater through the valley section ateach poit. Also the a mount of the surface water through those points and that of weirs at each point were detcrmind. (Tab. 3)
Using these data he calculatcd total water diseharge(Q) at the valley sections. From the increment of the total water discharge (ΔQ) and that of catchment area (ΔA) at the ne ghbouring point he calculated relative discharge ΔQ/ΔA. (Tab. 4)
Between Senoyama and Fujisaki this amount, being withount surface water supply, ows entirely to the ground water supply, and to his great interest it is intimately close to that of relative ordinaly discharge or the Kinokawa river, 0.0135m3/sec/km2.
