Which of the following is the correct expression among daily consumptive use rate (Cu), frequency of watering (fw) and the depth of water to be given during each watering (dw) related to irrigation?
1
fw = Cu + dw
2
\(\frac{{{C_u}}}{{{f_w}}} = \frac{1}{{{d_w}}}\)
3
\(\frac{1}{{{f_w}}} = \frac{{{d_w}}}{{{C_u}}}\)
4
\(\frac{1}{{{f_w}}} = \frac{{{C_u}}}{{{d_w}}}\)