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\cf2 Let the water flux application rate at the surface be }{\cf2\i r (cm/h)}{
\cf2 .  Here two cases need to be considered, first where }{\cf2\i r >K}{
\cf2\fs16\i\dn s}{\cf2 , and second where }{\cf2  }{\cf2\i r < K}{\cf2
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infiltration rate}{\cf2\i  (q)}{\cf2  is always equal to the surface 
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infiltration into a sandy soil under non-ponding conditions (a 
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Green-Ampt model with constant application rate (GACONST).  Input 
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0 0 1 1 1 0 0 1 1 Time (h)
0 0 1 1 1 0 0 1 1 Surface infiltration 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
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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
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\cf2 Figure B5-3.  Surface infiltration rate as a function of time. }}
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\cf2 Figure B5-4.  Cumulative Infiltration as  function of time.}}
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\cf2 E.  Discussion}}
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\cf2 Figure B5-1 shows a constant-flux infiltration pattern when r>K}{
\cf2\dn s}{\cf2 .  Before the surface }{\cf2 saturation first occurs 
at time}{\cf2\i  t}{\cf2\fs16\i\dn 0}{\cf2  ( 5 hours), infiltration 
rate is constant (=r) , after that,  infiltration rate decreases with 
time.  Figure B5-3 illustrates a soil infiltration with a constant 
rate equal to r.  Figures B5-2 and B5-4 deplict a nearly linear 
relationship between the cumulative infiltration and time during the 
infiltration period.}}