Stormwater Exam 1- - EXAM STUDY GUIDE
2026/2027 COMPLETE QUESTIONS WITH VERIFIED
CORRECT ANSWERS || 100% GUARANTEED PASS |
NEWEST VERSION
What process in the water cycle produces precipitation?
Condensation
Which process moves the moisture upward in the water cycle?
transpiration
What drives the design of urban storm drainage structures?
Rain
What is precipitation?
any product of the condensation of atmospheric water vapor that falls under gravitational pull
from
What are forms of precipitation?
-drizzle
-snow
-rain
Which one is the main difference between drizzle and rain?
Droplet size
What are the measurable parameters of rainfall?
Depth, intensity, duration
What are the two types of hyetographs?
-incremental
-cumulative
What do we use incremental hyetographs for?
,to find the time of the peak
What do we use cumulative hyetographs for?
Used to find the total rainfall
*steep slopes indicate peak rainfall intensity
What does a hyetograph show you?
Shows rainfall intensity (variability) over time
What does a hydrograph show you?
Shows discharge over time
What is a random event?
-something that has NOT happened yet, future event
-unpredictable, do not have the results
What can a time series plot tell us? What can we not directly read from time-series plots?
-shows variability of rainfall depth over time
-shows minimum and maximum rainfall depth
-cannot get the average rainfall depth
How many years of data did Hattori have?
20
What is used to determine the exceedance probability of an event and get the Cumulative
Distribution Function (CDF) for a set of samples?
Plotting Position Formulas
What is the basis for choosing a Theoretical Probability Distribution?
Goodness-of-Fit to the samples
IDF curves are developed based on ...
Historical Rainfall Data
In the "Continuous simulation" approach, the frequency analysis is done on what?
Runoff data, concerned about flood risk
What is the runoff equal to?
, Runoff = Total Rainfall Depth - Abstractions
Which items can be included in the "abstractions" category?
-Interception
-Transpiration
-Infiltration
-Evaporation
When does interception usually occur?
earliest portion of the storm, leaves reach their max holding capacity quickly
What is the summation of the total energy head?
-elevation head
-pressure head
-velocity head
What is elevation head (z)?
The height of the channel bottom to the datum
What is hydraulic head?
elevation head + pressure head
What does velocity head represent?
The energy from the water's speed
What does a Cumulative Distribution Function (CDF) show us?
shows the relationship between the magnitude of an event (like rainfall or flood) and its
likelihood of occurrence (exceedance probability)
What must be true for the probability of exceedance?
-value between 0 and 1
-obtained via frequency analysis
-very low probability of exceedance = very rare event
What is a return period?
-calculated as 1/ P
**P is the Probability of Exceedance
What is hydrologic risk?
2026/2027 COMPLETE QUESTIONS WITH VERIFIED
CORRECT ANSWERS || 100% GUARANTEED PASS |
NEWEST VERSION
What process in the water cycle produces precipitation?
Condensation
Which process moves the moisture upward in the water cycle?
transpiration
What drives the design of urban storm drainage structures?
Rain
What is precipitation?
any product of the condensation of atmospheric water vapor that falls under gravitational pull
from
What are forms of precipitation?
-drizzle
-snow
-rain
Which one is the main difference between drizzle and rain?
Droplet size
What are the measurable parameters of rainfall?
Depth, intensity, duration
What are the two types of hyetographs?
-incremental
-cumulative
What do we use incremental hyetographs for?
,to find the time of the peak
What do we use cumulative hyetographs for?
Used to find the total rainfall
*steep slopes indicate peak rainfall intensity
What does a hyetograph show you?
Shows rainfall intensity (variability) over time
What does a hydrograph show you?
Shows discharge over time
What is a random event?
-something that has NOT happened yet, future event
-unpredictable, do not have the results
What can a time series plot tell us? What can we not directly read from time-series plots?
-shows variability of rainfall depth over time
-shows minimum and maximum rainfall depth
-cannot get the average rainfall depth
How many years of data did Hattori have?
20
What is used to determine the exceedance probability of an event and get the Cumulative
Distribution Function (CDF) for a set of samples?
Plotting Position Formulas
What is the basis for choosing a Theoretical Probability Distribution?
Goodness-of-Fit to the samples
IDF curves are developed based on ...
Historical Rainfall Data
In the "Continuous simulation" approach, the frequency analysis is done on what?
Runoff data, concerned about flood risk
What is the runoff equal to?
, Runoff = Total Rainfall Depth - Abstractions
Which items can be included in the "abstractions" category?
-Interception
-Transpiration
-Infiltration
-Evaporation
When does interception usually occur?
earliest portion of the storm, leaves reach their max holding capacity quickly
What is the summation of the total energy head?
-elevation head
-pressure head
-velocity head
What is elevation head (z)?
The height of the channel bottom to the datum
What is hydraulic head?
elevation head + pressure head
What does velocity head represent?
The energy from the water's speed
What does a Cumulative Distribution Function (CDF) show us?
shows the relationship between the magnitude of an event (like rainfall or flood) and its
likelihood of occurrence (exceedance probability)
What must be true for the probability of exceedance?
-value between 0 and 1
-obtained via frequency analysis
-very low probability of exceedance = very rare event
What is a return period?
-calculated as 1/ P
**P is the Probability of Exceedance
What is hydrologic risk?
