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GATE2017 CE-2-23
During a storm event in a certain period, the rainfall intensity is $3.5$ cm/hour and the $\Phi$-index is $1.5$ cm/hour. The intensity of effective rainfall (in cm/hour, up to one decimal place) for this period is ________

During a storm event in a certain period, the rainfall intensity is $3.5$ cm/hour and the $\Phi$-index is $1.5$ cm/hour. The intensity of effective rainfall (in cm/hour, ...

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2

GATE2019 CE-1: 15
A catchment may be idealised as a rectangle. There are three rain gauges located inside the catchment at arbitrary locations. The average precipitation over the catchment is estimated by two methods: Arithmetic mean $(P_A)$ Thiessen polygon $(P_T)$ Which one of the ... greater than $P_T$ $P_A$ is always equal to $P_T$ There is no definite relationship between $P_A$ and $P_T$

A catchment may be idealised as a rectangle. There are three rain gauges located inside the catchment at arbitrary locations. The average precipitation over the catchment...

Arjun

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Arjun asked Feb 14, 2019

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3

GATE2019 CE-1: 49
The hyetograph of a storm event of duration $140$ minutes is shown in the figure: The infiltration capacity at the start of this event $(t=0)$ is $17 \: mm/hour$, which linearly decreases to $10 \: mm/hour$ after $40$ minutes duration. As the event ... of the storm event. The value of the infiltration index, $\phi$ (in $mm/hour$ round off to $2$ decimal places), is _____________

The hyetograph of a storm event of duration $140$ minutes is shown in the figure:The infiltration capacity at the start of this event $(t=0)$ is $17 \: mm/hour$, which li...

Arjun

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Arjun asked Feb 14, 2019

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4

GATE2018 CE-1: 48
Rainfall depth over a watershed is monitored through six number of well distributed rain gauges. Gauged data are given below ... The Thiessen mean value (in mm, up to one decimal place) of the rainfall is _____

Rainfall depth over a watershed is monitored through six number of well distributed rain gauges. Gauged data are given below$$\begin{array}{|c|c|} \hline\textbf{Rain Gaug...

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gatecse asked Feb 17, 2018

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5

GATE2018 CE-1: 49
The infiltration rate $f$ in a basin under ponding condition is given by $f = 30+10e^{-2t}$ where, $f$ is in mm/h and $t$ is time in hour. Total depth of infiltration (in mm, up to one decimal place) during the last $20$ minutes of a storm of $30$ minutes duration is ______

The infiltration rate $f$ in a basin under ponding condition is given by $f = 30+10e^{-2t}$ where, $f$ is in mm/h and $t$ is time in hour. Total depth of infiltration (in...

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gatecse asked Feb 17, 2018

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6

GATE2015-1-47
In a catchment, there are four rain-gauge stations, $P, Q, R$, and $S$. Normal annual precipitation values at these stations are $780$ mm, $850$ mm, $920$ mm, and $980$ mm, respectively. In the year $2013$, stations $Q, R$, and $S$, were operative ... the year $2013$ were $930$ mm and $1010$ mm, respectively; what was the observed precipitation (in mm) at station $S$ for that year?

In a catchment, there are four rain-gauge stations, $P, Q, R$, and $S$. Normal annual precipitation values at these stations are $780$ mm, $850$ mm, $920$ mm, and $980$ m...

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Milicevic3306 asked Mar 26, 2018

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7

GATE2019 CE-2: 50
The ordinates, $u$, of a $2$-hour unit hydrograph (i.e., for $1$ ... base flow is constant at $5 \: m^3/s$, the peak flow due to this storm (in $m^3/s$, round off to $1$ decimal place) will be __________

The ordinates, $u$, of a $2$-hour unit hydrograph (i.e., for $1$ cm of effective rain), for a catchment, are shown in the table.$$\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|c|c...

Arjun

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Arjun asked Feb 12, 2019

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8

GATE2015-1-43
Two reservoirs are connected through a $930$ m long, $0.3$ m diameter pipe, which has a gate valve. The pipe entrance is sharp (loss coefficient $=0.5$) and the valve is half-open (loss coefficient $=5.5$). The head difference between the two reservoirs is $20$ m. ... $0.03$ and $g=10\:m/s^2$. The discharge in the pipe accounting for all minor and major losses is ___________ $m^3/s$.

Two reservoirs are connected through a $930$ m long, $0.3$ m diameter pipe, which has a gate valve. The pipe entrance is sharp (loss coefficient $=0.5$) and the valve is ...

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Milicevic3306 asked Mar 26, 2018

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9

GATE Civil 2021 Set 2 | Question: 48
The hyetograph in the figure corresponds to a rainfall event of $\text{3 cm}$. If the rainfall event has produced a direct runoff of $\text{1.6 cm}$, the $\phi$-index of the event (in $\text{mm/hour},\textit{round off to one decimal place}$) would be

The hyetograph in the figure corresponds to a rainfall event of $\text{3 cm}$.If the rainfall event has produced a direct runoff of $\text{1.6 cm}$, the $\phi$-index of t...

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go_editor asked Mar 1, 2021

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10

GATE2019 CE-2: 47
A confined aquifer of $15 \: m$ constant thickness is sandwiched between two aquicludes as shown in the figure (not drawn to scale). The heads indicated by two piezometers P and Q are $55.2 \: m$ and $34.1 \: m$, respectively. The aquifer has a ... taken by the water to travel through the aquifer from piezometer location P to Q (in days, round off to $1$ decimal place) is ______

A confined aquifer of $15 \: m$ constant thickness is sandwiched between two aquicludes as shown in the figure (not drawn to scale).The heads indicated by two piezometers...

Arjun

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Arjun asked Feb 12, 2019

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11

GATE2020-CE-1-15
The data for an agricultural field for a specific month are given below: ... $mm$) to be applied to the field in that month, is $0$ $20$ $40$ $80$

The data for an agricultural field for a specific month are given below:$\begin{array}{ll}\text{Pan Evaporation} &=\:100\:mm\\ \text{Effective Rainfall} &=\:20\:mm\;\te...

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12

GATE2018 CE-2: 25
A culvert is designed for a flood frequency of $100$ years and a useful life of $20$ years. The risk involved in the design of the culvert (in percentage, up to two decimal places) is _______

A culvert is designed for a flood frequency of $100$ years and a useful life of $20$ years. The risk involved in the design of the culvert (in percentage, up to two decim...

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gatecse asked Feb 17, 2018

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13

GATE2016-2-46
The ordinates of a one-hour unit hydrograph at sixty minute interval are $0, 3, 12, 8, 6, 3$ and $0 \: m^3/s$. A two-hour storm of $4$ cm excess rainfall occurred in the basin from $10$ AM. Considering constant base flow of $20 \: m^3/s$, the flow of the river (expressed in $m^3/s$) at $1$ PM is ________

The ordinates of a one-hour unit hydrograph at sixty minute interval are $0, 3, 12, 8, 6, 3$ and $0 \: m^3/s$. A two-hour storm of $4$ cm excess rainfall occurred in the ...

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14

GATE2019 CE-1: 50
Two water reservoirs are connected by a siphon (running full) of total length $5000$ m and diameter of $1.10$ m, as shown below (figure not drawn to scale). The inlet leg length of the siphon to its summit is $2000$ m. The difference in the water surface ... of the summit of siphon from the water level of upper reservoir, $h$ (in m, round off to $1$ decimal place) is ______

Two water reservoirs are connected by a siphon (running full) of total length $5000$ m and diameter of $1.10$ m, as shown below (figure not drawn to scale).The inlet leg ...

Arjun

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Arjun asked Feb 14, 2019

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15

GATE2015-2-20
A groundwater sample was found to contain $500$ mg/L total dissolved solids (TDS). TDS (in $\%$) present in the sample is ________.

A groundwater sample was found to contain $500$ mg/L total dissolved solids (TDS). TDS (in $\%$) present in the sample is ________.

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Milicevic3306 asked Mar 26, 2018

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16

GATE2014-2-19
An isolated $3-h$ rainfall event on a small catchment produces a hydrograph peak and point of inflection on the falling limb of the hydrograph at $7$ hours and $8.5$ hours respectively, after the start of the rainfall. Assuming, no losses and no base flow contribution, the time of concentration (in hours) for the catchment is approximately $8.5$ $7.0$ $6.5$ $5.5$

An isolated $3-h$ rainfall event on a small catchment produces a hydrograph peak and point of inflection on the falling limb of the hydrograph at $7$ hours and $8.5$ hour...

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Milicevic3306 asked Mar 25, 2018

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17

GATE Civil 2021 Set 2 | Question: 33
A water filtration unit is made of uniform-size sand particles of $\text{0.4 mm}$ diameter with a shape factor of $0.84$ and specific gravity of $2.55$. The depth of the filter bed is $\text{0.70 m}$ and the porosity is $0.35$. The filter bed is to be expanded to a ... $6.35 \times 10^{-3}\text{ m/s}$ $0.69 \text{ cm/s}$ $0.75 \text{ cm/s}$

A water filtration unit is made of uniform-size sand particles of $\text{0.4 mm}$ diameter with a shape factor of $0.84$ and specific gravity of $2.55$. The depth of the ...

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18

GATE2020 CE-2-14
A triangular direct runoff hydrograph due to a storm has a time base of $90$ hours. The peak flow of $60\: m^3/s$ occurs at $20$ hours from the start of the storm. The area of catchment is $300\: km^2$. The rainfall excess of the storm (in cm), is $2.00$ $3.24$ $5.40$ $6.48$

A triangular direct runoff hydrograph due to a storm has a time base of $90$ hours. The peak flow of $60\: m^3/s$ occurs at $20$ hours from the start of the storm. The ar...

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go_editor asked Feb 13, 2020

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19

GATE2017 CE-2-47
A catchment is idealized as a $25 \: km \times 25 \: km$ ... . The average precipitation (in mm, up to one decimal place) over the catchment during this month by using the Thiessen polygon method is ___________

A catchment is idealized as a $25 \: km \times 25 \: km$ square. It has five rain gauges, one at each corner and one at the corner, as shown in the figure.During a month,...

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20

GATE Civil 2013 | Question: 55
At a station, Storm I of $5$ hour duration with intensity $2$ cm/h resulted in a runoff of $4$ cm and Storm II of $8$ hour duration resulted in a runoff of $8.4$ cm. Assume that the $\phi$ – index is the same for the both the storms. The intensity of storm II (in cm/h) is $2.00$ $1.75$ $1.50$ $2.25$

At a station, Storm I of $5$ hour duration with intensity $2$ cm/h resulted in a runoff of $4$ cm and Storm II of $8$ hour duration resulted in a runoff of $8.4$ cm. Assu...

Milicevic3306

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Milicevic3306 asked Mar 25, 2018

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21

GATE2018 CE-1: 24
For routing of flood in a given channel using the Muskingum method, two of the routing coefficients are estimated as $C_0=-0.25$ and $C_1=0.55$. The value of the third coefficient $C_2$ would be ____

For routing of flood in a given channel using the Muskingum method, two of the routing coefficients are estimated as $C_0=-0.25$ and $C_1=0.55$. The value of the third co...

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gatecse asked Feb 17, 2018

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22

GATE Civil 2013 | Question: 54
At a station, Storm I of $5$ hour duration with intensity $2$ cm/h resulted in a runoff of $4$ cm and Storm II of $8$ hour duration resulted in a runoff of $8.4$ cm. Assume that the $\phi$ – index is the same for the both the storms. The $\phi$ – index (in cm/h) is $1.2$ $1.0$ $1.6$ $1.4$

At a station, Storm I of $5$ hour duration with intensity $2$ cm/h resulted in a runoff of $4$ cm and Storm II of $8$ hour duration resulted in a runoff of $8.4$ cm. Assu...

Milicevic3306

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Milicevic3306 asked Mar 25, 2018

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23

GATE2015-1-48
The $4$-hr unit hydrograph for a catchment is given in the table below. What would be the maximum ordinate of the S - curve (in $m^3/s$ ...

The $4$-hr unit hydrograph for a catchment is given in the table below. What would be the maximum ordinate of the S – curve (in $m^3/s$) derived from this hydrograph?$$...

Milicevic3306

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Milicevic3306 asked Mar 26, 2018

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24

GATE2015-2-19
The relationship between porosity $(\eta)$, specific yield $(S_y)$ and specific retention $(S_\tau)$ of an unconfined aquifer is: $S_y+S_\tau = \eta$ $S_y+ \eta = S_\tau$ $S_\tau+ \eta = S_y$ $S_y+ S_\tau + \eta =1$

The relationship between porosity $(\eta)$, specific yield $(S_y)$ and specific retention $(S_\tau)$ of an unconfined aquifer is:$S_y+S_\tau = \eta$$S_y+ \eta = S_\tau$$S...

Milicevic3306

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Milicevic3306 asked Mar 26, 2018

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25

GATE2015-2-46
A pipe of $0.7$ m diameter has a length of $6$ km and connects two reservoirs A and B. The water level in reservoir A is at an elevation $30$ m above the water level in reservoir B. Halfway along the pipe line, there is a branch through which water can be supplied ... to gravity as $9.81 \: m/s^2$ and neglecting minor losses, the discharge (in $m^3/s$) into the reservoir B is _______.

A pipe of $0.7$ m diameter has a length of $6$ km and connects two reservoirs A and B. The water level in reservoir A is at an elevation $30$ m above the water level in r...

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26

GATE2016-2-49
A tracer takes $100$ days to travel from Well-$1$ to Well-$2$ which are $100 \: m$ apart. The elevation of water surface in Well-$2$ is $3 \: m$ below that in Well-$1$. Assuming porosity equal to $15 \%$, the coefficient of permeability (expressed in $m/day$) is $0.30$ $0.45$ $1.00$ $5.00$

A tracer takes $100$ days to travel from Well-$1$ to Well-$2$ which are $100 \: m$ apart. The elevation of water surface in Well-$2$ is $3 \: m$ below that in Well-$1$. A...

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27

GATE2020-CE-1-49
Three reservoirs $P,Q$ and $R$ are interconnected by pipes as shown in the figure (not drawn to the scale). Piezometric head at the junction $S$ of the pipes is $100\:m$. Assume acceleration due to gravity as $9.81\:m/s^2$ ... height of water level in the lowermost reservoir $R$ (in $m$, round off to one decimal place) with respect to the datum, is ______.

Three reservoirs $P,Q$ and $R$ are interconnected by pipes as shown in the figure (not drawn to the scale). Piezometric head at the junction $S$ of the pipes is $100\:m$....

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28

GATE2017 CE-1: 51
An effective rainfall of $2$-hour duration produced of flood hydrograph peak of $200 \: m^3/s$. The flood hydrograph has a base flow of $20 \: m^3/s$. If the spatial average rainfall in the watershed for the duration of storm is $2$ cm and the average loss rate is $0.4$ cm/hour, the peak of $2$-hour unit hydrograph (in $m^3/s-cm$ up to one decimal place) is ________

An effective rainfall of $2$-hour duration produced of flood hydrograph peak of $200 \: m^3/s$. The flood hydrograph has a base flow of $20 \: m^3/s$. If the spatial aver...

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29

GATE2017 CE-1: 24
The ordinates of a $2$-hour unit hydrograph for a catchment are given as $\begin{array}{llllll} \text{Time (h)} & 0 & 1 & 2 & 3 & 4 \\ \text{Ordinate } (m^3/s) & 0 & 5 & 12 & 25 & 41 \end{array}$ The ordinate (in $m^3/s$) of a $4$-hour unit hydrograph for this catchment at the time of $3$ h would be _________

The ordinates of a $2$-hour unit hydrograph for a catchment are given as$$\begin{array}{llllll} \text{Time (h)} & 0 & 1 & 2 & 3 & 4 \\ \text{Ordinate } (m^3/s) & 0 & 5 &...

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30

GATE2020-CE-1-16
During chlorination process, aqueous (aq) chlorine reacts rapidly with water to form $Cl^-,HOCl$, and $H^+$ as shown below $Cl_2(aq)+H_2O\:{\large\rightleftharpoons}\:HOCl+Cl^-+H^+$ The most active disinfectant in the chlorination process from amongst the following, is $H^+$ $HOCl$ $Cl^-$ $H_2O$

During chlorination process, aqueous (aq) chlorine reacts rapidly with water to form $Cl^-,HOCl$, and $H^+$ as shown below $$Cl_2(aq)+H_2O\:{\large\rightleftharpoons}\:HO...

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31

GATE Civil 2021 Set 2 | Question: 22
A $12$-hour unit hydrograph (of $\text{1 cm}$ excess rainfall) of a catchment is of a triangular shape with a base width of $144$ hour and a peak discharge of $23\text{ m}^3\text{/s}$. The area of the catchment (in $\text{km}^2, \textit{round off to the nearest integer}$) is _____________

A $12$-hour unit hydrograph (of $\text{1 cm}$ excess rainfall) of a catchment is of a triangular shape with a base width of $144$ hour and a peak discharge of $23\text{ m...

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go_editor asked Mar 1, 2021

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32

GATE2020 CE-2-12
Muskingum method is used in hydrologic reservoir routing hydrologic channel routing hydraulic channel routing hydraulic reservoir routing

Muskingum method is used inhydrologic reservoir routinghydrologic channel routinghydraulic channel routinghydraulic reservoir routing

go_editor

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go_editor asked Feb 13, 2020

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33

GATE Civil 2013 | Question: 39
A $2$ km long pipe of $0.2$ m diameter connects two reservoirs. The difference between water levels in the reservoirs is $8$ m. The Darcy-Weisbachfriction factor of the pipe is $0.04$. Accounting for frictional, entry exit losses, the velocity in the pipe (in m/s) is $0.63$ $0.35$ $2.52$ $1.25$

A $2$ km long pipe of $0.2$ m diameter connects two reservoirs. The difference between water levels in the reservoirs is $8$ m. The Darcy-Weisbachfriction factor of the p...

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34

GATE2018 CE-2: 47
The total rainfall in a catchment of area $1000 \: km^2$, during a $6$ h storm, is $19$ cm. The surface runoff due to this storm computed from triangular direct runoff hydrograph is $ 1 \times 10^8 \: m^3$. The $\phi_{\text{index}}$ for this storm (in cm/h, up to one decimal place) is ____

The total rainfall in a catchment of area $1000 \: km^2$, during a $6$ h storm, is $19$ cm. The surface runoff due to this storm computed from triangular direct runoff hy...

gatecse

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gatecse asked Feb 17, 2018

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35

GATE Civil 2012 | Question: 55
The drainage are of a watershed is $50 \: km^2$. The $\phi$ index is $0.5 \: cm/hour$ and the base flow at the outlet is $10 \: m^3/s$. One hour unit hydrograph (unit depth $=1 \: cm$) of the water shed is triangular in shape with a time base of $15$ ... $1$ hour, the peak ordinate (in $m^3/s$) of the hydrograph is $55.00$ $82.60$ $92.60$ $102.60$

The drainage are of a watershed is $50 \: km^2$. The $\phi$ index is $0.5 \: cm/hour$ and the base flow at the outlet is $10 \: m^3/s$. One hour unit hydrograph (unit dep...

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36

GATE2014-1-19
In reservoirs with an uncontrolled spillway, the peak of the plotted outflow hydrograph lies outside the plotted inflow hydrograph lies on the recession limb of the plotted inflow hydrograph lies on the peak of the inflow hydrograph is higher than the peak of the plotted inflow hydrograph

In reservoirs with an uncontrolled spillway, the peak of the plotted outflow hydrographlies outside the plotted inflow hydrographlies on the recession limb of the plotted...

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Milicevic3306 asked Mar 25, 2018

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37

GATE2017 CE-2-24
The infiltration capacity of a soil follows the Horton's exponential model, $f=c_1+c_2e^{-kt}$. During an experiment, the initial infiltration capacity was observed to be $200$ mm/h. After a long time, the infiltration capacity was reduced $25$ mm/h. If the filtration capacity ... $k$ (in $h^{-1}$, up to two decimal places) is ________

The infiltration capacity of a soil follows the Horton’s exponential model, $f=c_1+c_2e^{-kt}$. During an experiment, the initial infiltration capacity was observed to ...

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38

GATE2015-2-45
The average surface area of a reservoir in the month of June is $20 \: km^2$. In the same month, the average rate of inflow is $10 \: m^3/s$, outflow rate is $15 \: m^3/s$, monthly rainfall is $10$ cm, monthly seepage loss is $1.8$ cm and the storage change is $16 \: million \: m^3$. The evaporation (in cm) in that month is: $46.8$ $136.0$ $13.6$ $23.4$

The average surface area of a reservoir in the month of June is $20 \: km^2$. In the same month, the average rate of inflow is $10 \: m^3/s$, outflow rate is $15 \: m^3/s...

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39

GATE Civil 2021 Set 1 | Question: 24
Two reservoirs are connected through a homogeneous and isotropic aquifer having hydraulic conductivity $\text{(K)}$ of $25$ $\text{m}$/day and effective porosity $\left ( \eta \right )$ of $0.3$ as shown in the figure (not to scale ... , $\textit{round off to one decimal place}$) taken by the contaminated water to reach to Reservoir $2$ will be _______________

Two reservoirs are connected through a homogeneous and isotropic aquifer having hydraulic conductivity $\text{(K)}$ of $25$ $\text{m}$/day and effective porosity $\left (...

Arjun

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Arjun asked Feb 19, 2021

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40

GATE2016-1-15
The type of flood routing (Group I) and the equation(s) used for the purpose (Group II) are given below. ... $P-1 \: \& \: 2; Q-1 \text{ only}$ $P-1 \: \& 2; \: Q-1 \: \& \: 2$

The type of flood routing (Group I) and the equation(s) used for the purpose (Group II) are given below.$$\begin{array}{ll} \underline{\text{Group I}} & \underline{\text{...

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