Watershed Hydrology Practice Exam

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• Which of the following is not an important component of an annual watershed water budget based on long-term average fluxes?
• What are the key assumptions behind the unit hydrograph and when do these assumptions fail?
• PMP is used to establish design storm envelopes for which purposes?
• The rating curve shape is determined by which channel characteristics?
• A groundwater discharge area is characterized by which property? (Alternate)
• In the SCS Curve Number method Ia approximates losses before runoff and is typically Ia ≈ 0.2S. What does S represent?
• In hydrologic design, what is a design storm?
• Snowpack snowmelt modeling uses degree-day or energy-balance approaches.
• The specific yield of an unconfined aquifer depends on what?
• Which of the following methods is commonly used to estimate time of concentration?
• A unit hydrograph represents the direct runoff hydrograph produced by how much rainfall excess at the catchment input?
• In Horton’s infiltration model, what do f0 and β represent?
• The effective catchment may differ from the surface drainage area due to subsurface flows. Which option correctly expresses this concept?
• In the SCS-CN method, what does AMC II represent?
• Which statement represents the basic water balance equation for a watershed?
• The equation Es = v^2 / (2g) + D defines specific energy. Which statement best describes its use?
• Which routing approach explicitly accounts for channel storage and attenuation through a storage equation?
• Which statement differentiates event-based hydrology from continuous simulation hydrology?
• Which quantities are related in the Muskingum channel routing method?
• What best describes the backwater effect in hydrologic routing?
• Which constants are needed to convert latent heat flux to an evaporation depth?
• Which term describes the average duration water spends in a storage reservoir?
• In the SCS-CN method, what does antecedent moisture condition (AMC) describe, and how does AMC II affect CN?
• Return period is also known as which term?
• Which process releases the most energy per kilogram during a phase change or warming or cooling?
• Which portion of streamflow is above baseflow?
• In Green-Ampt infiltration modeling, which parameter pair characterizes the infiltration process?
• Discharge in a stream which statement is correct?
• Which combination of variables is sufficient to estimate discharge in a stream?
• What component is essential to convert measured stage into discharge for flood analysis?
• What is attenuation in hydrologic routing?
• What are common methods to estimate pollutant load in watershed hydrology?
• In canopy hydrology, stemflow refers to:
• What is the main difference between hydrologic models and water quality models in watershed analysis?
• Which statement best distinguishes sediment load and sediment yield?
• How can GIS support hydrologic modeling and watershed analysis?
• PET stands for
• Interception loss describes water that evaporates from rainfall intercepted by vegetation before reaching the soil. This statement is
• ET rates are
• A rating curve is defined as which of the following?
• Which of the following is NOT a component of total evaporation or evapotranspiration?
• The stage-discharge relation or rating curve is nonlinear and its curved shape is generally plotted on which axes?
• When applying Darcy's Law to flow in the unsaturated zone, which statement is true?
• Which sequence correctly lists the major steps in precipitable water formation?
• Measurement of the height of the pool behind a broad-crested weir helps estimate discharge because...
• Darcy's Law is applicable under which condition?
• Green-Ampt infiltration is best suited for which soil condition?
• Which statement best describes design storms used in engineering practice?
• A culvert designed to pass a 50-year flood flow will fail over the next 25 years with what probability?
• In highly urbanized areas, CN-based hydrologic methods may be replaced by approaches focused on what?
• What is Probable Maximum Precipitation (PMP) and what is its role in hydrologic design?
• Drainage density is defined
• Adiabatic cooling is defined as which process?
• The temporary retention of water in canopy or litter before it drips to the ground is called what?
• What approach is commonly used to assess climate-change impacts on watershed hydrology?
• In a confined aquifer, storativity is typically:
• Under water-limited conditions, actual evapotranspiration is typically
• Which statement is NOT a characteristic feature of the unsaturated or vadose zone?
• In energy concepts, Es represents which quantity?
• Which statement about adiabatic cooling is true?
• The capillary fringe description best matches which statement?
• What is channel storage and how does it affect hydrologic routing?
• During a steady rain or irrigation event with slight ponding, the soil infiltration capacity decreases over time because:
• Baseflow is primarily associated with which source?
• Which metrics are commonly used as objective functions during hydrologic model calibration?
• Which is an example of a distributed hydrologic model?
• We discussed several unique properties of water. Select the answer that is most correct.
• The cumulative distribution function is the integrated form of the probability density function and represents which type of probability?
• Baseflow of a stream is defined as which of the following?
• Identify key sources of uncertainty in watershed modeling and strategies to reduce them.
• The curved shape of the rating curve is generally:
• Throughfall is best described as the portion of precipitation that:
• Best Management Practices (BMPs) in watershed hydrology include which of the following, and what is their effect?
• When calculating evapotranspiration using the water balance equation, errors in the estimate of evapotranspiration are
• What is the role of environmental hydraulics in watershed management?
• In water balance calculations, ET is partitioned into transpiration and evaporation. Which statement is correct about the partitioning?
• Infiltration-excess overland flow is most likely to occur under which rainfall scenario?
• In flood frequency analysis, which data record is typically collected to fit a flood distribution?
• How is the rating curve typically developed for a stream?
• Describe PMF and contrast it with design storms used in practice.
• Flood frequency analysis yields which of the following?
• In a simple mass-balance pollutant transport approach, which processes update pollutant mass?
• Describe a simple mass-balance approach to pollutant transport in a watershed.
• Describe a basic calibration and validation workflow for a hydrologic model.
• At critical flow mean water velocity is:
• Why do supercooled water molecules preferentially sublimate and deposit on ice crystals in cold clouds?
• In hydrologic terms, which term represents soil moisture before a rainfall event?
• The stationarity assumption in flood frequency analysis implies:
• Which factor is thought to influence precipitation measurement accuracy?
• Sleet forms when precipitation undergoes which process as it falls to the ground?
• Drainage density is defined as the length of all streams in a network divided by drainage area. Which option matches this definition?
• What is a standard practice when propagating uncertainties in a water budget?
• In Es = v^2/2g + D, what does D denote?
• The potentiometric surface is defined as what?
• Which statement best explains why evapotranspiration is often estimated from the regional water balance rather than calculated directly?
• Groundwater near the surface discharging to the surface is described by which direction?
• The Penman equation was developed to overcome what measurement limitation in estimating evaporation?
• Which statement about water's polarity is true?
• What is a key caveat when using sediment rating curves?
• Which statement correctly describes the Rational Method for peak discharge estimation and its limitations?
• What is the name of the wind shield used in the USA to reduce precipitation catch error?
• The hydraulic head h equals the sum of which heads? (Alternate phrasing)
• The potentiometric surface is defined as which?
• Approximately what percent of freshwater on the Earth's surface is water in rivers and streams?
• Which statement about Darcy's law is NOT correct?
• Canopy interception loss is best described as:
• Which statement about ET partitioning is true?
• Snow is formed in cold clouds through which process as water vapor accumulates on ice crystals?
• Which option is NOT one of the three primary steps in precipitable water formation?
• Evaporation limited only by energy and aerodynamic factors is called
• Which statement describes the Bergeron process?
• Peak streamflows and precipitation intensities generally do not follow a normal distribution. Which statement best describes their typical skewness?
• The topographic wetness index describes
• Which statement correctly contrasts Muskingum and Muskingum-Cunge routing?
• Which runoff process would you expect to be dominant for a humid-region watershed that has steep slopes and well-drained soils?
• In critical flow, the Froude number equals
• Which statement best describes why Horton’s infiltration capacity decays over time during rainfall?
• Infiltration-excess runoff occurs when rainfall intensity exceeds what?
• As the averaging time for precipitation measurements decreases from annual to hourly, the probability distribution becomes which of the following?
• Explain baseflow separation and name two common methods.
• If groundwater exchange G is considered, which form represents the water balance equation?
• In the global continental water balance, which term has been assumed negligible?
• Baseflow is groundwater-derived discharge contributing to streamflow. Which of the following describes two common baseflow separation approaches?
• The three primary steps in the formation of precipitable water in the atmosphere are:
• Where is capillary fringe located relative to the water table?
• What additional term did Monteith include in the Penman equation to estimate transpiration through the combination of energy and aerodynamic drivers?
• What variables does the Topographic Wetness Index use to predict saturation?
• Leaf Area Index is defined as
• Curve Number approach for estimating direct runoff assumes which runoff generation process?
• The effective watershed or catchment is
• The canopy storage capacity is greater for broad-leaved tree species than for needle-leaved species.
• The lack of rigidity in the hydrogen bonds between liquid water molecules gives it which property?
• Which statement best describes the relationship between annual evapotranspiration and annual runoff for a typical Virginia watershed?
• Which instrument stabilizes the surface for accurate stage measurement?
• The cumulative density function, obtained by integrating the probability density function, represents which probability type?
• From the early to the mid-20th century, which aspects of hydrology formed the basis of the discipline?
• Select the statement least correct about a watershed.
• Which models are commonly used to predict snowmelt runoff?
• If the 2022 peak flow was the largest on record, what is the chance that the same magnitude or greater occurs in the next year?
• Is an Acoustic Doppler Current Profiler used to estimate the rating curve directly?
• Which statement best summarizes the role of linearity, superposition, and stationarity in hydrologic modeling?
• Three conditions necessary for evaporation are
• Explain infiltration capacity and how it evolves during a storm.
• Which statement best describes quickflow?
• Which option best describes the effect of urbanization on rainfall-runoff response and CN-based modeling?
• At steady-state, the ratio of the average storage of a reservoir to the average rate of inflow or outflow is called.
• Assuming a bulk density of about 1300 kg/m3, what is a reasonable approximation of the porosity?
• What does baseflow and the recession slope indicate in hydrograph recession analysis?
• Return period (recurrence interval) for a flood magnitude is defined as:
• Which of the following are drought analysis approaches described in the material?
• How many measurement sections are needed to estimate stream discharge?
• Leaf Area Index is generally higher for mature broad-leaved trees compared to mature needle-leaved trees. This statement is
• Which statement about baseflow separation methods is true?
• A hydrograph is a plot of discharge versus time. Which features reflect watershed characteristics?
• How can climate change influence watershed hydrology and how is impact assessment conducted?
• For a 200-year interval estimate, the method is valid under what condition?
• Field capacity is defined as:
• Which two methods are widely used to estimate evapotranspiration in watershed studies?
• If the return period of a given annual precipitation amount is 10 years, which statement is true?
• In precipitation measurement, what term describes the portion of precipitation that is actually collected by the gauge?
• If the return period for a particular river flow magnitude is 10 years, the exceedance probability for that event is:
• Which term refers to the area of land where precipitation drains to a common outlet?
• How does backwater influence the peak discharge in routing?
• What is the relationship between a 10-year return period and its exceedance probability?
• Differentiate infiltration-excess and saturation-excess runoff mechanisms with respect to rainfall intensity and soil moisture.
• Interflow, or throughflow, is described as which of the following?
• What does the initial abstraction Ia physically represent in rainfall-runoff modeling?
• As the averaging time shortens from annual to hourly, the distribution of precipitation becomes which of the following?
• The unsaturated or vadose zone is characterized by which of the following statements?
• What is the primary consequence of choosing a watershed outlet?
• What is the purpose of hydrograph recession analysis?
• In a confined aquifer, storativity is equal to which quantity?
• How do hydrologists minimize the value of the annual ΔS/Δt?
• A structure for stream measuring discharge that constricts flow width within a cross-section is called:
• Which statement correctly describes addressing nonstationarity in flood frequency analysis?
• The hydraulic head h is equal to the sum of which heads?
• Matric potential in the zone above the water table is:
• The vertical velocity profile in channels most often is approximated by which curve?
• When calculating uncertainties for fluxes in a water budget, errors are standardized with an assumed distribution because
• A groundwater discharge area is characterized by which feature?
• In the unsaturated zone above the water table, which statement is correct about pore water pressure and pressure head?
• Which statement about hydraulic head is true?
• When estimating evapotranspiration from the regional water balance equation, which common assumption is made?
• What does a bucket-type soil moisture model use as key parameters?
• Outline a simple soil moisture accounting framework used in rainfall-runoff modeling.
• The specific yield of an unconfined aquifer depends on the aquifer material. Which option states this correctly?
• Time of concentration is defined as the travel time for water from where to the outlet?
• When soils are wetting, which statement is correct?
• Define routing time and its relation to time of concentration.
• Which statement correctly contrasts lumped-parameter and distributed-parameter hydrologic models?
• Saturation-excess overland flow is most likely to occur in which setting?
• The term hysteresis refers to:
• Which statement correctly characterizes the share of freshwater in rivers?
• When Darcy's Law is applied to flow in the unsaturated zone, which statement is true?
• Which factor is NOT thought to influence precipitation measurement?
• The upper boundary of a confined aquifer is formed by what feature?
• The Penman equation estimates evaporation by combining net radiant energy with what other factor?
• Which statement describes infiltration during the early part of wetting when macropores are present?
• How does environmental hydraulics integrate with watershed hydrology for management?
• Which statement is true about the infiltration process during a ponded rainfall event according to the provided concepts?
• Hortonian overland flow is another term for which process?
• Increasing peak flows over time is most likely an indicator of which process?
• Infiltration-excess overland flow is most likely to occur in which setting?
• The convolution of rainfall excess hyetograph with a unit hydrograph yields what?
• Discuss sediment transport concepts and the purpose of sediment rating curves.
• How can regionalization help apply hydrologic models to ungaged basins?
• The variable source area concept for the generation of stormflow within a watershed refers to which concept?
• In the Strahler method, what is the stream order when two streams of order 2 join?
• The recommended approach to estimating the mean vertical velocity of a section of a stream that is greater than 0.75 meters depth is determined:
• Regarding a confined aquifer, the upper boundary is formed by what?