Flooding Cause and Effect

Flooding that occurs OUTSIDE the property

Red = Outside property owner’s control  |  Green = Within property owners control

Location
Street Flooding

floodedcorner2

Effect

Water damage to vehicles
Limited access for people and vehicles
Flooded yards and garages
Wake against homes due to vehicles passing through flood waters

Cause

Extreme rain events
Melting snow
Saturated/frozen ground
Stormwater or river/stream flooding
Blocked culverts
Stormsewer backup
Clogged inlet

Location
Property Flooding

john-bemmerts-flooded-yard

Effect

Temporary ponding
Window well backup
Yard flooding
Garage or shed flooding
Seepage of water into the building
Damage to lawn and landscaping

Cause

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
Landscaping (obstructs stormwater)
Built features (obstructs stormwater)
Impervious surfaces
Unmaintained pervious pavement
Improper grading
Stormsewer backup
Stormwater discharge from adjacent properties

Flooding that occurs INSIDE the property

Red = Outside property owner’s control  |  Green = Within property owners control

Location
Stormwater Surcharge

sump-pump-470-0209-mdn

Effect

Backup through/on...

Sump pump pit
Streets and properties
Basement window wells, drains

Cause

Inflow/infiltration due to cracks/broken pipes during extreme rain events
Downspouts drain directly to sewer
Exceeded sewer capacity
Illegal connection to sewer

Location
Sanitary Sewer Surcharge

index

Effect

Backup through…
Drains and toilet fixtures
Ejector pump pit

Cause

Inflow/infiltration due to cracks or broken pipes during extreme rain events
Downspouts incorrectly drain to sanitary sewer rather than stormsewer
Exceeded sewer capacity

Location
Pump Failure

Pumping-out-flooded-basement-e1383925668851

Effect

Overflow and flooding via..
Sump pump pit
Ejector pump pit

Cause

Loss of power
Lack of pump maintenance
Absence of battery backup
Absence of back flow prevention
Insufficient capacity

Location
Seepage

RoofLeak

Effect

Seepage through/over…
Basement floors, walls, roof
Crawl space
Door, window frames
Broken window
Foundation wall
Doorway threshold
Street/property flooding (overland flow)

Cause

Extreme rain events
Cracks/holes/joints in elements through which water seeps in
Inadequate flood proofing
Improper grading
Low opening into building (door, window)

 

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