The infiltration capacity of a soil follows the Horton's exponential model. $f=C_{1}+C_{2} e^{-k t}$. During an experiment. the initial infiltration capacity was observed to be $200 \mathrm{~mm} / \mathrm{h}$. After a long time, the infiltration capacity was reduced to $25 \mathrm{~mm} / \mathrm{h}$. If the infiltration capacity after 1 hour was $90 \mathrm{~mm} / \mathrm{h}$. the value of the decay rate constant. $k$ (in $\mathrm{h}^{-1}$. up to two decimal places)

is

The infiltration capacity of a soil follows the Horton's exponential model. $f=C_{1}+C_{2} e^{-k t}$. During an experiment. the initial infiltration capacity was observed to be $200 \mathrm{~mm} / \mathrm{h}$. After a long time, the infiltration capacity was reduced to $25 \mathrm{~mm} / \mathrm{h}$. If the infiltration capacity after 1 hour was $90 \mathrm{~mm} / \mathrm{h}$. the value of the decay rate constant. $k$ (in $\mathrm{h}^{-1}$. up to two decimal places)

is

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