Storm Water Management Exam 2
UPDATED ACTUAL Questions and
CORRECT Answers
Two Types of Hydraulic Flow - CORRECT ANSWER -Under Pressure and Open to
Atmosphere
Explain the 4 Flow Types - CORRECT ANSWER -Uniform Steady: Constant with
distance and time.
Uniform Unsteady: Constant with distance, Inconsistent with time.
Nonuniform Steady: Constant with time, Inconsistent with distance.
Nonuniform Unsteady: Inconsistent with distance and time.
Hydraulic Conditions in a Pipe - CORRECT ANSWER -Typically slightly unsteady but
treated as steady in calculations.
What is Viscosity - CORRECT ANSWER -Resistance to Motion
What does Reynolds Number (Re) identify - CORRECT ANSWER -Characteristic of the
flow
Laminar: Re < 2000
Turbulent: Re > 4000
Transitional: 4000 > Re > 2000
Units for Head - CORRECT ANSWER -Energy / Unit Weight
, What makes up head loss? - CORRECT ANSWER -Frictional and Local Losses
Frictional: Forces between liquid and solid barrier.
Local: Disruptions at physical features like bends and size changes.
What is the Energy Grade Line (EGL)? - CORRECT ANSWER -Distance from the
horizontal datum to the total head.
What is the Hydraulic Grade Line (HGL)? - CORRECT ANSWER -Distance from EGL
to vertical head.
What are friction losses dependent on? - CORRECT ANSWER -Reynold's Number
Where do local losses occur? - CORRECT ANSWER -At points where flow is disrupted
within a pipe such as a bend or valve.
What is surcharge? - CORRECT ANSWER -Pipes exceeding their maximum flow.
Two types of surcharge? - CORRECT ANSWER -Manhole Surcharge and Pipe Surcharge
What is the value of a minimum velocity for a sewer pipe? - CORRECT ANSWER -To
establish self cleansing properties.
Conditions dictating max flow? - CORRECT ANSWER -Energy losses at bends
Hydraulic Jumps
Cavitation
Air entrapment
UPDATED ACTUAL Questions and
CORRECT Answers
Two Types of Hydraulic Flow - CORRECT ANSWER -Under Pressure and Open to
Atmosphere
Explain the 4 Flow Types - CORRECT ANSWER -Uniform Steady: Constant with
distance and time.
Uniform Unsteady: Constant with distance, Inconsistent with time.
Nonuniform Steady: Constant with time, Inconsistent with distance.
Nonuniform Unsteady: Inconsistent with distance and time.
Hydraulic Conditions in a Pipe - CORRECT ANSWER -Typically slightly unsteady but
treated as steady in calculations.
What is Viscosity - CORRECT ANSWER -Resistance to Motion
What does Reynolds Number (Re) identify - CORRECT ANSWER -Characteristic of the
flow
Laminar: Re < 2000
Turbulent: Re > 4000
Transitional: 4000 > Re > 2000
Units for Head - CORRECT ANSWER -Energy / Unit Weight
, What makes up head loss? - CORRECT ANSWER -Frictional and Local Losses
Frictional: Forces between liquid and solid barrier.
Local: Disruptions at physical features like bends and size changes.
What is the Energy Grade Line (EGL)? - CORRECT ANSWER -Distance from the
horizontal datum to the total head.
What is the Hydraulic Grade Line (HGL)? - CORRECT ANSWER -Distance from EGL
to vertical head.
What are friction losses dependent on? - CORRECT ANSWER -Reynold's Number
Where do local losses occur? - CORRECT ANSWER -At points where flow is disrupted
within a pipe such as a bend or valve.
What is surcharge? - CORRECT ANSWER -Pipes exceeding their maximum flow.
Two types of surcharge? - CORRECT ANSWER -Manhole Surcharge and Pipe Surcharge
What is the value of a minimum velocity for a sewer pipe? - CORRECT ANSWER -To
establish self cleansing properties.
Conditions dictating max flow? - CORRECT ANSWER -Energy losses at bends
Hydraulic Jumps
Cavitation
Air entrapment
