Three geometrically identical Lysimeters $(\mathrm{A}, \mathrm{B}$ and $\mathrm{C})$ installed in a paddy field have uniform initial ponding depths of $12 \mathrm{~cm}$. After a week, the recorded water depths in $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are $10.4 \mathrm{~cm}, 8.6 \mathrm{~cm},$ and $7.0 \mathrm{~cm},$ respectively. Rainfall received during this week is $15 \mathrm{~mm},$ and the crop coefficient of paddy is 0.94 . Lysimeter ' $\mathrm{A}$ ' has a closed bottom with no plant. Lysimeter 'B' has an open bottom with no plant. Lysimeter 'C' has an open bottom with paddy plants. Neglecting the boundary effects and groundwater contribution in the Lysimeters, the weekly potential evapotranspiration will be_____________ $\quad \mathrm{cm}$.

Three geometrically identical Lysimeters $(\mathrm{A}, \mathrm{B}$ and $\mathrm{C})$ installed in a paddy field have uniform initial ponding depths of $12 \mathrm{~cm}$. After a week, the recorded water depths in $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are $10.4 \mathrm{~cm}, 8.6 \mathrm{~cm},$ and $7.0 \mathrm{~cm},$ respectively. Rainfall received during this week is $15 \mathrm{~mm},$ and the crop coefficient of paddy is 0.94 . Lysimeter ' $\mathrm{A}$ ' has a closed bottom with no plant. Lysimeter 'B' has an open bottom with no plant. Lysimeter 'C' has an open bottom with paddy plants. Neglecting the boundary effects and groundwater contribution in the Lysimeters, the weekly potential evapotranspiration will be_____________ $\quad \mathrm{cm}$.

A rectangular chute spillway is designed for gully erosion control with a drop (H) of $5 \mathrm{~m}$, peak flow of $1.81 \mathrm{~m}^{3} \mathrm{~s}^{-1}$ and maximum inlet water level of $0.81 \mathrm{~m}$. Frictional head loss over the apron is $20 \%$ of $\mathrm{H}$. The design height of chute blocks is equal to the depth of flow in the water way. Acceleration due to gravity (g) is $9.81 \mathrm{~m} \mathrm{~s}^{-2} .$ If coefficient of discharge of the weir section is 1.66, height of the chute blocks is _____________$\quad \mathrm{m}$.

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