| Abstrakt: |
Philip's two-term infiltration equation I= St1/2+ At, sometimes fails to describe field results precisely. Though physically less appropriate, I = mtn, the Lewis-Kostiakov equation, is advantageous in that it can accommodate varieties of field results. For the case where nis greater than 1/2, the term tncan be expanded suitably, and if only two terms of this expanded time series are considered, the equation I = m0t1/2+ m1t3/2is formed. This equation describes the field results more precisely than Philip's two-term equation. Two sets of published data (Lewis 1937) and six sets of experimentally observed data for various time ranges are examined here. The agreement between the observed and generated data (using the present model) is found to be very good. |
