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Recent questions and answers in Hydrology
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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 _____________
asked
Mar 1
in
Hydrology
by
jothee
(
5.2k
points)
gatecivil2021set2
numericalanswers
surfacerunoffmodels
rainfall
0
votes
0
answers
2
GATE Civil 2021 Set 2  Question: 33
A water filtration unit is made of uniformsize 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 ... $6.35 \times 10^{3}\text{ m/s}$ $0.69 \text{ cm/s}$ $0.75 \text{ cm/s}$
asked
Mar 1
in
Hydrology
by
jothee
(
5.2k
points)
gatecivil2021set2
infiltration
0
votes
0
answers
3
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
asked
Mar 1
in
Hydrology
by
jothee
(
5.2k
points)
gatecivil2021set2
numericalanswers
surfacerunoffmodels
0
votes
0
answers
4
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 _______________
asked
Feb 20
in
Hydrology
by
Arjun
(
8.7k
points)
gatecivil2021set1
numericalanswers
hydraulicsandacquifers
reservoirs
0
votes
0
answers
5
GATE Civil 2021 Set 1  Question: 50
A tubewell of $20\text{ cm}$ diameter fully penetrates a horizontal, homogeneous and isotropic confined aquifer of infinite horizontal extent. The aquifer is of $30 \text{ m}$ ... $\text{m/day}, \textit{round off to integer}$) is ________________
asked
Feb 20
in
Hydrology
by
Arjun
(
8.7k
points)
gatecivil2021set1
numericalanswers
groundwaterhydrology
hydraulicsandacquifers
0
votes
0
answers
6
GATE2020CE149
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 ______.
asked
Feb 28, 2020
in
Hydrology
by
jothee
(
5.2k
points)
gate2020ce1
hydrology
waterresourcesengineering
reservoirs
numericalanswers
0
votes
0
answers
7
GATE2020CE151
A circular water tank of $2\:m$ diameter has a circular orifice of diameter $0.1\:m$ at the bottom. Water enters the tank steadily at a flow rate of $20\:litre/s$ and escapes through the orifice. The coefficient of discharge of the orifice is $0.8$. ... losses. The height of the water level (in $m$, round off to two decimal places) in the tank at the steady state, is ______.
asked
Feb 28, 2020
in
Hydrology
by
jothee
(
5.2k
points)
gate2020ce1
hydrology
waterresourcesengineering
steadystate
numericalanswers
0
votes
0
answers
8
GATE2020 CE212
Muskingum method is used in hydrologic reservoir routing hydrologic channel routing hydraulic channel routing hydraulic reservoir routing
asked
Feb 13, 2020
in
Hydrology
by
jothee
(
5.2k
points)
gate2020ce2
hydrology
hydraulics
waterresourcesengineering
muskingummethod
0
votes
0
answers
9
GATE2020 CE214
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 $2.00$ $3.24$ $5.40$ $6.48$
asked
Feb 13, 2020
in
Hydrology
by
jothee
(
5.2k
points)
gate2020ce2
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
10
GATE2017 CE247
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 ___________
asked
Aug 7, 2019
in
Hydrology
by
gatecse
(
4k
points)
gate2017ce2
numericalanswers
hydrology
waterresourcesengineering
precipitation
0
votes
0
answers
11
GATE2019 CE1: 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 ______
asked
Feb 14, 2019
in
Hydrology
by
Arjun
(
8.7k
points)
gate2019ce1
numericalanswers
hydrology
waterresourcesengineering
reservoirs
0
votes
0
answers
12
GATE2019 CE2: 14
An inflow hydrograph is routed through a reservoir to produce an outflow hydrograph. The peak flow of the inflow hydrograph is $P_I$ and the time of occurrence of the peak is $t_I$. The peak flow of the outflow hydrograph is $P_O$ and the time of occurrence of the peak is $t_O$. ... $P_I <P_O$ and $t_I > t_O$ $P_I >P_O$ and $t_I < t_O$ $P_I >P_O$ and $t_I > t_O$
asked
Feb 12, 2019
in
Hydrology
by
Arjun
(
8.7k
points)
gate2019ce2
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
13
GATE2019 CE2: 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 __________
asked
Feb 12, 2019
in
Hydrology
by
Arjun
(
8.7k
points)
gate2019ce2
numericalanswers
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
14
GATE2016246
The ordinates of a onehour unit hydrograph at sixty minute interval are $0, 3, 12, 8, 6, 3$ and $0 \: m^3/s$. A twohour 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 ________
asked
Mar 28, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2016ce2
numericalanswers
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
15
GATE2016114
The direct runoff hydrograph in response to $5$ cm rainfall excess in a catchment is shown in the figure. The area of the catchment (expressed in hectares) is ________
asked
Mar 28, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2016ce1
numericalanswers
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
16
GATE2016115
The type of flood routing (Group I) and the equation(s) used for the purpose (Group II) are given below. ... $P1 \: \& \: 2; Q1 \text{ only}$ $P1 \: \& 2; \: Q1 \: \& \: 2$
asked
Mar 28, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2016ce1
hydrology
waterresourcesengineering
floodestimationandrouting
0
votes
0
answers
17
GATE2017 CE1: 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 _________
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2017ce1
numericalanswers
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
18
GATE2017 CE1: 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 $m^3/scm$ up to one decimal place) is ________
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2017ce1
numericalanswers
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
19
GATE2015220
A groundwater sample was found to contain $500$ mg/L total dissolved solids (TDS). TDS (in $\%$) present in the sample is ________.
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2015ce2
numericalanswers
hydrology
waterresourcesengineering
groundwater
0
votes
0
answers
20
GATE2015245
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: $46.8$ $136.0$ $13.6$ $23.4$
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2015ce2
hydrology
waterresourcesengineering
reservoir
0
votes
0
answers
21
GATE2015143
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 halfopen (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 ___________ $m^3/s$.
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2015ce1
numericalanswers
hydrology
waterresourcesengineering
reservoirs
0
votes
0
answers
22
GATE2015147
In a catchment, there are four raingauge 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?
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2015ce1
numericalanswers
hydrology
waterresourcesengineering
precipitation
0
votes
0
answers
23
GATE2015148
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 $m^3/s$ ...
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2015ce1
numericalanswers
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
24
GATE2014220
The Muskingum model of routing a flood through a stream reach is expressed as $O_2 =K_0I_2+K_1I_1+K_2O_1$, where $K_0$, $K_1$ and $K_2$ are the routing coefficients for the concerned reach, $I_1$ and $I_2$ are the inflows to the reach, and $O_1$ and $O_2$ are the outflows from the reach ... and $2$ respectively. The sum of $K_0$, $K_1$ and $K_2$ of the model is $1$ $0.5$ $0.5$ $1$
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2014ce2
hydrology
waterresourcesengineering
muskingummodel
0
votes
0
answers
25
GATE2014219
An isolated $3h$ 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 $8.5$ $7.0$ $6.5$ $5.5$
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2014ce2
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
26
GATE2014119
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
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2014ce1
hydrology
waterresourcesengineering
reservoirs
hydrographs
0
votes
0
answers
27
GATE Civil 2013  Question: 19
An isohyet is a line joining points of equal temperature equal humidity equal rainfall depth equal evaporation
asked
Mar 26, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2013ce
hydrology
waterresourcesengineering
evaporation
0
votes
0
answers
28
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 $55.00$ $82.60$ $92.60$ $102.60$
asked
Mar 25, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2012ce
hydrology
waterresourcesengineering
hydrograph
0
votes
0
answers
29
GATE Civil 2012  Question: 38
Steady state seepage is taking place through a soil element at $Q$, $2$ m below the ground surface immediately downstream of the toe of an earthen dam as shown in the sketch. The water level in a piezometer installed at $P$, $500$ mm above $Q$, is at the ground surface. ... $Q$ is $14.42$ $15.89$ $16.38$ $18.34$
asked
Mar 25, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2012ce
hydrology
waterresourcesengineering
steadystate
0
votes
0
answers
30
GATE Civil 2012  Question: 19
The ratio of actual evapotranspiration of potential evapotranspiration is in the range $0.0$ to $0.4$ $0.6$ to $0.9$ $0.0$ to $1.0$ $1.0$ to $2.0$
asked
Mar 25, 2018
in
Hydrology
by
Milicevic3306
(
11.9k
points)
gate2012ce
hydrology
waterresourcesengineering
evapotranspiration
0
votes
0
answers
31
GATE2018 CE2: 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 ____
asked
Feb 17, 2018
in
Hydrology
by
gatecse
(
4k
points)
gate2018ce2
numericalanswers
hydrology
waterresourcesengineering
hydrographs
0
votes
0
answers
32
GATE2018 CE2: 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 _______
asked
Feb 17, 2018
in
Hydrology
by
gatecse
(
4k
points)
gate2018ce2
numericalanswers
floodestimationandrouting
hydrology
waterresourcesengineering
0
votes
0
answers
33
GATE2018 CE1: 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 ____
asked
Feb 17, 2018
in
Hydrology
by
gatecse
(
4k
points)
gate2018ce1
numericalanswers
hydrology
waterresourcesengineering
floodestimationandrouting
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