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\cf2 The vertical movement of soil water between the surface and the 
water table can be divided into two processes according to the 
predominant forces involved: (1) infiltration and (2) exfiltration 
(evaportranspiration).  An infiltration/exfiltration model (INFEXF) 
developed by Eagleson (1978) was selected to estimate the water 
infiltration during wetting season and exfiltration during drying 
season.  Infiltration and exfiltration are described by Philip's 
equation, which assumes the medium to be effectively semi-infinite and 
the internal soil water content at the beginning of each storm and 
interstorm period is assumed to be uniform at its long term  
space-time average.  The exfiltration equation is modified for 
presence of natural vegetation through the approximate introduction of 
a distributed sink representing the moisture extraction by plant 
roots.  Two cases were presented in this application.  The first case 
is the water infiltration into a  sandy loam during storms.  A 
boundary condition with saturated water content on the soil surface is  
assumed.   In this case,  rainfall intensity is assumed to be greater 
than the infiltration capacity.  The second case is the exfiltration 
during drying surface (interstorm) periods with a dry soil surface and 
under the assumption that potential evaporation is greater than the 
exfiltration capacity.}}
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&&(_n_u_l_l_&_n_u_l_l_)&({0:fe}NAME)[({0:t}NAME)@&&(_n_u_l_l_&_n_u_l_l_)&{0:t}NAME
0 0 1 1 1 0 0 1 1 Time (h)
0 0 1 1 1 0 0 1 1 Exfiltration rate (cm/h)
0 1 0 0 1 1 NO-TRACE-STRING
0 2 1 0 1 1 NO-TRACE-STRING
0 3 2 0 1 1 NO-TRACE-STRING
0 4 3 0 1 1 NO-TRACE-STRING
0 1 4 0 1 1 NO-TRACE-STRING
0 2 5 0 1 1 NO-TRACE-STRING
0 3 6 0 1 1 NO-TRACE-STRING
0 4 0 0 1 1 NO-TRACE-STRING
0 1 1 0 1 1 NO-TRACE-STRING
0 2 2 0 1 1 NO-TRACE-STRING
0 3 3 0 1 1 NO-TRACE-STRING
0 4 4 0 1 1 NO-TRACE-STRING
0 1 5 0 1 1 NO-TRACE-STRING
0 2 6 0 1 1 NO-TRACE-STRING
0 3 0 0 1 1 NO-TRACE-STRING
0 4 1 0 1 1 NO-TRACE-STRING
0 1 1 21 15 10 0 2 
.TXT 30 4 2109 0 0
Cg a30.750000,30.750000,76
{\rtf\ansi \deff0{\colortbl;\red0\green0\blue0;\red64\green0\blue64;}{
\fonttbl{\f0\fcharset0\fnil Times New Roman;}}\plain\cf1\fs20\b \pard {
\cf2 Figure B6-2.  Water exfiltration as a function of time during 
drying season.}}
.TXT 17 -37 1978 0 0
Cg a72.000000,72.000000,13
{\rtf\ansi \deff0{\colortbl;\red0\green0\blue0;\red64\green0\blue64;}{
\fonttbl{\f0\fcharset0\fnil Times New Roman;}}\plain\cf1\fs20\b \pard {
\cf2 D. Discussion}}
.TXT 5 2 1944 0 0
Cg a66.000000,66.000000,571
{\rtf\ansi \deff0{\colortbl;\red0\green0\blue0;\red64\green0\blue64;}{
\fonttbl{\f0\fcharset0\fnil Times New Roman;}}\plain\cf1\fs20\b \pard {
\cf2 Water Infiltration into and exfiltration out of soil surface as a 
function of time is shown in Figures B6-1 and B6-2, respectively.  }{
\cf2 Figure B6-1 shows a typical soil infiltration pattern, with an 
infiltration rate relatively high at the onset of the infiltration, 
then decreasing, and eventually approaching a constant rate.  Figure 
B6-2 (Case 2)  illustrates that  exfiltration (actual evaporation) 
decreases with time.    Nagative value of  exfiltration indicates that 
exfiltration has ceased (}{\cf2 at the time of  11 hours}{\cf2  in 
this case) but transpiration is still going on.}}