WRM3701 Research Project 2026 - Practice
Questions and Corrrect Verified Answers.
Question 1
In a catchment experiencing increasing urbanization, which hydrological response is
most likely to occur during a high-intensity rainfall event?
A) Increased infiltration and reduced peak discharge
B) Reduced surface runoff and delayed hydrograph peak
C) Increased peak discharge and shorter lag time
D) Decreased rainfall intensity and increased evapotranspiration
Correct Answer: C - Increased peak discharge and shorter lag time
Rationale: Urbanization increases impervious surfaces such as roads and buildings,
reducing infiltration and accelerating surface runoff. This leads to a faster concentration
of flow in rivers, increasing peak discharge and reducing lag time. Option A is incorrect
because infiltration decreases, not increases. Option B is incorrect because runoff
increases and lag time decreases rather than increases. Option D is unrelated, as rainfall
intensity is not directly affected by urbanization in hydrological response terms .
Question 2
Which method is most appropriate for estimating runoff in a small urban catchment
with limited historical flow data?
A) Rational Method
B) Muskingum Method
,C) Unit Hydrograph derived from gauged flood events
D) Darcy's Law application
Correct Answer: A - Rational Method
Rationale: The Rational Method is widely used for small catchments and requires
minimal data, making it suitable for urban areas with limited hydrological records. It
estimates peak discharge using rainfall intensity, runoff coefficient, and area. Option B is
used for channel routing, not runoff estimation. Option C requires historical flood
hydrographs, which are unavailable. Option D applies to groundwater flow, not surface
runoff estimation .
Question 3
A rectangular channel experiences subcritical flow. If the slope is gradually increased
while keeping other parameters constant, what is the expected hydraulic response?
A) Flow becomes deeper and slower
B) Flow transitions toward critical and then supercritical conditions
C) Flow velocity decreases due to increased friction
D) Hydraulic radius decreases significantly causing stagnation
Correct Answer: B - Flow transitions toward critical and then supercritical
conditions
Rationale: Increasing slope increases gravitational force, accelerating flow. Subcritical
flow (Fr < 1) moves toward critical (Fr = 1) and may become supercritical (Fr > 1). Option
A is incorrect because flow does not deepen and slow under increased slope. Option C
is incorrect because velocity increases, not decreases. Option D is not physically
consistent with open channel hydraulics behavior .
,Question 4
Which condition best describes critical flow in open channel hydraulics?
A) Minimum specific energy for a given discharge
B) Maximum flow depth for a given energy
C) Flow dominated entirely by viscous forces
D) Flow at zero Froude number
Correct Answer: A - Minimum specific energy for a given discharge
Rationale: Critical flow occurs when specific energy is minimized for a given discharge
and Froude number equals 1. Option B is incorrect because critical flow corresponds to
minimum not maximum energy conditions. Option C is incorrect because inertia
dominates rather than viscosity. Option D is incorrect because Froude number is 1, not
zero .
Question 5
A watershed experiences increased urbanization, resulting in higher peak runoff and
reduced groundwater recharge. Which hydrological change best explains this outcome?
A) Increased infiltration due to vegetation growth
B) Decreased surface imperviousness
C) Increased impervious surfaces reducing infiltration
D) Increased evapotranspiration from soil moisture
Correct Answer: C - Increased impervious surfaces reducing infiltration
Rationale: Urbanization increases impervious surfaces such as roads and buildings,
preventing water infiltration and increasing surface runoff. This leads to higher peak
, discharge and reduced groundwater recharge. The other options incorrectly assume
increased infiltration or evapotranspiration processes that are typically reduced in urban
environments .
Question 6
Which component of the hydrological cycle directly transfers water from vegetation
back into the atmosphere?
A) Condensation
B) Evapotranspiration
C) Infiltration
D) Percolation
Correct Answer: B - Evapotranspiration
Rationale: Evapotranspiration combines evaporation and plant transpiration, returning
water from vegetation and soil to the atmosphere. The other options represent
subsurface or phase-change processes not involving vegetation release .
Question 7
A river system shows increased sediment load after deforestation. What is the primary
cause?
A) Reduced precipitation intensity
B) Increased soil stability
C) Loss of root structures binding soil
D) Increased groundwater recharge
Questions and Corrrect Verified Answers.
Question 1
In a catchment experiencing increasing urbanization, which hydrological response is
most likely to occur during a high-intensity rainfall event?
A) Increased infiltration and reduced peak discharge
B) Reduced surface runoff and delayed hydrograph peak
C) Increased peak discharge and shorter lag time
D) Decreased rainfall intensity and increased evapotranspiration
Correct Answer: C - Increased peak discharge and shorter lag time
Rationale: Urbanization increases impervious surfaces such as roads and buildings,
reducing infiltration and accelerating surface runoff. This leads to a faster concentration
of flow in rivers, increasing peak discharge and reducing lag time. Option A is incorrect
because infiltration decreases, not increases. Option B is incorrect because runoff
increases and lag time decreases rather than increases. Option D is unrelated, as rainfall
intensity is not directly affected by urbanization in hydrological response terms .
Question 2
Which method is most appropriate for estimating runoff in a small urban catchment
with limited historical flow data?
A) Rational Method
B) Muskingum Method
,C) Unit Hydrograph derived from gauged flood events
D) Darcy's Law application
Correct Answer: A - Rational Method
Rationale: The Rational Method is widely used for small catchments and requires
minimal data, making it suitable for urban areas with limited hydrological records. It
estimates peak discharge using rainfall intensity, runoff coefficient, and area. Option B is
used for channel routing, not runoff estimation. Option C requires historical flood
hydrographs, which are unavailable. Option D applies to groundwater flow, not surface
runoff estimation .
Question 3
A rectangular channel experiences subcritical flow. If the slope is gradually increased
while keeping other parameters constant, what is the expected hydraulic response?
A) Flow becomes deeper and slower
B) Flow transitions toward critical and then supercritical conditions
C) Flow velocity decreases due to increased friction
D) Hydraulic radius decreases significantly causing stagnation
Correct Answer: B - Flow transitions toward critical and then supercritical
conditions
Rationale: Increasing slope increases gravitational force, accelerating flow. Subcritical
flow (Fr < 1) moves toward critical (Fr = 1) and may become supercritical (Fr > 1). Option
A is incorrect because flow does not deepen and slow under increased slope. Option C
is incorrect because velocity increases, not decreases. Option D is not physically
consistent with open channel hydraulics behavior .
,Question 4
Which condition best describes critical flow in open channel hydraulics?
A) Minimum specific energy for a given discharge
B) Maximum flow depth for a given energy
C) Flow dominated entirely by viscous forces
D) Flow at zero Froude number
Correct Answer: A - Minimum specific energy for a given discharge
Rationale: Critical flow occurs when specific energy is minimized for a given discharge
and Froude number equals 1. Option B is incorrect because critical flow corresponds to
minimum not maximum energy conditions. Option C is incorrect because inertia
dominates rather than viscosity. Option D is incorrect because Froude number is 1, not
zero .
Question 5
A watershed experiences increased urbanization, resulting in higher peak runoff and
reduced groundwater recharge. Which hydrological change best explains this outcome?
A) Increased infiltration due to vegetation growth
B) Decreased surface imperviousness
C) Increased impervious surfaces reducing infiltration
D) Increased evapotranspiration from soil moisture
Correct Answer: C - Increased impervious surfaces reducing infiltration
Rationale: Urbanization increases impervious surfaces such as roads and buildings,
preventing water infiltration and increasing surface runoff. This leads to higher peak
, discharge and reduced groundwater recharge. The other options incorrectly assume
increased infiltration or evapotranspiration processes that are typically reduced in urban
environments .
Question 6
Which component of the hydrological cycle directly transfers water from vegetation
back into the atmosphere?
A) Condensation
B) Evapotranspiration
C) Infiltration
D) Percolation
Correct Answer: B - Evapotranspiration
Rationale: Evapotranspiration combines evaporation and plant transpiration, returning
water from vegetation and soil to the atmosphere. The other options represent
subsurface or phase-change processes not involving vegetation release .
Question 7
A river system shows increased sediment load after deforestation. What is the primary
cause?
A) Reduced precipitation intensity
B) Increased soil stability
C) Loss of root structures binding soil
D) Increased groundwater recharge
