GATE Overflow for GATE ESE - Recent questions in Surface Water Resources

GATE ES 2026 | Question: 46

Mon, 23 Feb 2026 13:14:29 +0000

The mass curve of a rainfall event of $100$ $\mathrm{min}$ duration over a catchment is given in the table.

If the initial loss is $0.6$ $\mathrm{cm}$ and $\phi$-index is $0.6 \mathrm{~cm} /\text{hour}$, the total surface runoff from the catchment is $\_\_\_\_$ $\mathrm{cm}$ (rounded off to one decimal place).

$$\begin{array}{|l|l|l|l|l|l|l|}
\hline
\begin{array}{l}
\text{Time from start of} \\
\text{rainfall (min)}
\end{array}
& 0 & 20 & 40 & 60 & 80 & 100 \\
\hline
\text{Cumulative rainfall (cm)} & 0 & 0.5 & 1.2 & 2.6 & 3.3 & 3.5 \\
\hline
\end{array}$$

GATE ES 2025 | Question: 6

Thu, 06 Mar 2025 16:22:44 +0000

For flood routing, consider the following statements

$\text{P}$ : Hydrologic routing method uses continuity equation and momentum equation

$\text{Q}$ : Hydraulic routing method uses continuity equation and energy equation

Choose the correct option from the following

$P$ is TRUE; $Q$ is TRUE
$P$ is TRUE; $Q$ is FALSE
$P$ is FALSE; $Q$ is TRUE
$P$ is FALSE; $Q$ is FALSE

GATE ES 2025 | Question: 43

Thu, 06 Mar 2025 16:21:09 +0000

The following table and figure (not to scale) show characteristics of a catchment

$$\begin{array}{|c|c|c|c|} \hline \text{Sub-} & \text{Area}  &\text{Runoff} & \text{Time of} \\
\text{catchment}
& (ha) & \text{coefficient}  &
  \text{concentration} \\
\hline \boldsymbol{P} & 750 & 0.5 & 1 \text{ hour} \\
\hline \boldsymbol{Q} & 1000 & 0.6 & 2 \text { hour} \\
\hline \boldsymbol{R} & 1500 & 0.6 & 3 \text{ hour} \\
\hline \boldsymbol{S} & 2000 & 0.7 & 4 \text{ hour} \\
\hline
\end{array}$$

The hyetograph resulting from a storm that occurred uniformly over the catchment, is as follows

Assuming a constant base flow of $40 \mathrm{~m}^{3} / \mathrm{s}$, the peak of the runoff hydrograph produced by storm for the catchment at the outlet $\boldsymbol{O}$ is $\_\_\_\_\_ \: \mathrm{m}^{3 /} \mathrm{s}$. (rounded off to two decimal places)

GATE ES 2024 | Question: 25

Mon, 19 Feb 2024 10:24:09 +0000

A Class-A pan was setup adjacent to a lake for measuring evaporation losses in the lake. The depth of water in the pan at the beginning of a certain week was $250 \mathrm{~mm}$. In that week, there was a rainfall event with $10 \mathrm{~mm}$ depth. Water depth in the pan at the end of the week was $240 \mathrm{~mm}$. The pan coefficient is $0.8$.

The estimated lake evaporation during the week was _________ $\mathrm{mm}$ $\text{(an integer value)}$.

GATE ES 2024 | Question: 45

Mon, 19 Feb 2024 10:24:06 +0000

Consider a watershed and isohyets as shown in the figure. The average rainfall in the watershed is ___________ $\mathrm{mm}$ $\text{(an integer value)}$.

GATE ES 2023 | Question: 24

Tue, 23 May 2023 03:12:20 +0000

An S-hydrograph was prepared for a catchment of $240 \mathrm{~km}^2$ using 3-hour unit hydrograph $(1 \mathrm{~cm}$ rainfall excess). The equilibrium discharge for the S-hydrograph would be ____________ (in $\mathrm{m}^3 / \mathrm{s}$, $\text{rounded off to two decimal places)}$.

GATE ES 2023 | Question: 41

Tue, 23 May 2023 03:11:58 +0000

The following figure (not to the scale) shows a catchment $(\mathrm{Q}, \mathrm{S}, \mathrm{U}, \mathrm{T}, \mathrm{Q})$ and adjoining raingauge stations $\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S}, \mathrm{U}$ and $\mathrm{V}$. Due to a storm, $20 \mathrm{~mm}, 25 \mathrm{~mm}$, $30 \mathrm{~mm}, 15 \mathrm{~mm}, 22 \mathrm{~mm}$ and $18 \mathrm{~mm}$ rainfall depths were recorded by raingauges at $\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S}, \mathrm{U}$ and $V$, respectively.

The corresponding mean rainfall over the catchment using Thiessen polygon method is____________ $\text{(in mm, rounded off to two decimal places).}$

GATE ES 2022 | Question: 8

Fri, 17 Feb 2023 07:06:11 +0000

Consider the following statements
Statement $1$: Goodrich method for reservoir routing is based on hydrologic flood routing method.

Statement $2$: Muskingum method for channel routing is based on hydraulic flood routing method.
Which one of the following is correct?

Statement $1$ is false; Statement $2$ is false
Statement $1$ is true; Statement $2$ is false
Statement $1$is true; Statement $2$ is true
Statement $1$is false; Statement $2$ is true

GATE ES 2022 | Question: 25

Fri, 17 Feb 2023 07:05:52 +0000

The following figure shows a $2$-hour unit hydrograph ( $1 \mathrm{~cm}$ rainfall excess) for a catchment area of $540$ hectare.

The peak discharge (in $\mathrm{m}^{3} / \mathrm{s}$, rounded off to one decimal place) of the above unit hydrograph is