On the Relationship between the Water Level in the River and the Water Table Depth of Shallow Groundwater in Paddy Fields

Abstract

Using six years of data, the relationship between the depth of the river water and the water table depth of the shallow groundwater in paddy fields was studied and the following obtained;
1) The relationship between D (the depth of the water table of the shallow groundwater in paddy fields measured from the ground surface) and H (the water depth of the Aya River) could be expressed by a simple, linear equation as shown in Eq. (3).
2) The values of RDH show that the degree of the relationship between D and H varied with the values of Hg (the height of the well sites above sea level). A linear equation was constructed, as shown in Eq. (4), showing the relationship between RDH and Hg.
3) The degree of the relationship beween D and H also varied with L (the distance of the well from the Aya River). Eqs. (5) and (6) were constructed to show the relationship between RNDH and L. RNDH had the same value as RDH during the non-irrigation period.