# The drawdown at the well face of a $30 \mathrm{~cm}$ diameter fully penetrating well in a confined aquifer is $3 \mathrm{~m}$. The radius of influence of this well is $3 \mathrm{~km}$. For the same discharge and aquifer condition, the drawdown at $300 \mathrm{~m}$ away from the centre of the well is_____________ $\quad \mathrm{m}$.

## Question ID - 156531 :- The drawdown at the well face of a $30 \mathrm{~cm}$ diameter fully penetrating well in a confined aquifer is $3 \mathrm{~m}$. The radius of influence of this well is $3 \mathrm{~km}$. For the same discharge and aquifer condition, the drawdown at $300 \mathrm{~m}$ away from the centre of the well is_____________ $\quad \mathrm{m}$.

3537

Answer Key : (0.68 to 0.71) -

0.68 to 0.71

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A permanent matured orchard has a tree spacing of $4 \mathrm{~m} \times 5 \mathrm{~m}$. Each tree has a shading area of $40 \%$ to be irrigated with the 'pig tail' pattern multi-exit drip emitters. The effective wetting geometry of each emitter is $2 \mathrm{~m} \times 2 \mathrm{~m}$. The emitters have discharge constant and exponent of 0.3 and $0.6,$ respectively. The coefficient of variation of emitter discharge is 0.06. The average and minimum operating pressures are $120 \mathrm{kPa}$ and $100 \mathrm{kPa}$, respectively. The emission uniformity of the emitters is_________________ $\%$