Sides, R.D. and Prathapar, S.A. and Meyer, W.S. and Plumb, L.A.
(1993)
Estimating recharge and monitoring the development of a water table mound ponded rice.
Technical Report.
CSIRO, Canberra, Australia.
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Abstract
During 1990/91, experiments were designed to estimate recharge to groundwater and to monitor the development of the water table mound from a ponded rice bay. Three experiments were set up: 1) To estimate recharge from the deuterium and oxygen isotopic signatures from the irrigationand groundwater samples taken during the growing season. 2) To estimate the hydraulic conductivity of the soil profile and recharge to the water table. 3) To monitor the development of the water table mound within the rice bay and into the adjacent bare bay. The isotope study showed that theirrigation water reached the water table and influenced the isotopic signature of the water table within 4 days after ponding. It also provided an approximate flow rate at which the initially unsaturated soil profile was filled following ponding. The recovery tests indicated that recharge wasrestricted by the surface layer. The hydraulic conductivity of the soil profile ranged from 4.8 mm/d to 21.7 mm/d, increasing with depth. Considering the hydraulic gradient across the restricting layer and its hydraulic conductivity, the recharge rate was estimated as 0.7 mm/d (1.3 ML/season).Although the water table within the bay reached equilibrium at an approximate depth of 1.5 m
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