Flooding Cause and Effect

Where does it happen?

What are the effects?

What causes it to happen?

Street Flooding

(Outside)

  • Water damage to vehicles
  • Limited access for people and vehicles
  • Flooded yards and garages
  • Wake against homes due to vehicles passing through flood waters
  • Extreme rain events
  • Melting snow
  • Saturated/frozen ground
  • Stormwater or river/stream flooding
  • Blocked culverts
  • Stormsewer backup
  • Clogged inlet
Property Flooding

(Outside)

  • Temporary ponding
  • Window well backup
  • Yard flooding
  • Garage or shed flooding
  • Seepage of water into the building
  • Damage to lawn and landscaping
  • Extreme rain events
  • Melting snow
  • Saturated/frozen ground
  • Stormwater or river/stream flooding
  • Blocked culverts
  • Stormsewer backup
  • Clogged inlet
  • Sump pump discharge
  • Down spout discharge
  • Clogged gutters
  • Alleys graded higher than yards
  • Landscape features that obstruct the flow of stormwater
  • Built features that obstruct the flow of stormwater
  • Impervious surfaces
  • Unmaintained pervious pavement
  • Improper grading
  • Stormsewer backup
  • Stormwater discharge from adjacent properties

Where does it happen?

What are the effects?

What causes it to happen?

Stormwater Surcharge
(Inside)
  • Backup through the sump pump pit
  • Backup on streets and properties
  • Backup through basement window wells and drains
  • Inflow/infiltration due to cracks/broken pipes during extreme rain events
  • Downspouts that drain directly to the sewer
  • Exceeded sewer capacity
  • Illegal connection to sewer
Sanitary Sewer Surcharge(Inside)
  • Backup through floor drains, shower drains and toilet fixtures
  • Backup through the ejector pump pit
  • Inflow/infiltration due to cracks or broken pipes during extreme rain events
  • Downspouts that incorrectly drain to sanitary sewer rather than stormsewer
  • Exceeded sewer capacity
Pump Failure
  • Sump pump pit overflow causing basement flooding
  • Ejector pump pit overflow causing basement flooding
!    Loss of power
G    Lack of pump maintenance
G    Absence of battery backup
G    Absence of back flow prevention
G    Insufficient capacity
Seepage
  • Seepage through the basement floor and walls, roof
  • Seepage through the crawl space
  • Seepage around door and window frames
  • Flow over a doorway threshold
  • Flow through a broken window
  • Seepage over the top of a foundation wall
!    Street/property flooding (overland flow)
!    Extreme rain events
G    Cracks, holes or joints in elements through which water seeps in
G    Inadequate flood proofing
G    Improper grading
G    Low opening into building (door, window)

 

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