Coastal Property Owner Slope Drainage Checklist

Slope Characteristics

Slope Height:

  • less than 10 feet
  • 10 to 50 feet
  • greater than 50 feet

Slope Angle:

____ degrees (see discussion in Slope Stabilization and Erosion Control)

Slope Vegetation:

  • bare soil areas
  • vegetation cut, removed or cleared
  • mature vegetation (trees, shrubs and ground cover)
  • water loving plants (horsetail, skunk cabbage, willow, salmonberry, etc.)

Slope Geology:

  • sand or sand and gravel
  • glacial till
  • silt/clay
  • rock

Landslide Indicators:

  • recent slide
  • bowl-shaped slope configuration
  • hummocky ground
  • leaning trees or bowed trunks
  • areas of low brush (blackberry)/bare areas

Coastal Zone Atlas:

  • landslide area
  • unstable
  • intermediate stability
  • stable

Beach Access:

  • stairs
  • wide path/road
  • tram
  • narrow path

Site Groundwater

Groundwater Observation:

  • seepage on slope: crest, face, or toe?
  • wet soil zone: crest, face, or toe?
  • vegetation indications of wet soil: crest, face, or toe?

Location of observed groundwater:

  • Near-surface soil seepage 1 to 3 feet below crest of slope
  • Groundwater seepage 5 to 10 feet below crest of slope
  • Groundwater seepage on slope face more than 10 feet below crest or at slope toe

Site Surface Water

Surface Water Features:

  • stream channel
  • ponds/wetlands
    how far from crest of slope?__________
  • flows down/over the slope
  • tightline down slope
  • erosion evidence: rills, gulleys, etc.

Surface Water/Storm Water Flows

  • Sheet flow from:
    • driveway
    • parking area
    • lawn
    • other
  • Roof downspouts empty:
    • onto ground
    • into buried pipe
    • other
  • Outlet for downspout pipe:
    • into soil or on surface of slope
    • tightlined down slope
    • unknown (test with hose)
  • Other pipe/culvert discharges:
    • onto slope
    • tightlined down slope
    • other
  • Areas where surface water disappears into ground?
    • Yes
    • No
  • Seepage/water noticed along beach access path?
    • Yes
    • No

Other Site Features

Location of:

  • Septic system
    • between house and slope
    • behind house
    • N/A
  • Irrigation system
    • any leaks
    • summer use only
    • control valve off and lines drained in winter
  • Downspout infiltration system
    • between house and slope
    • behind house
    • not applicable
  • Landscape yard drains
    • tightline down slope
    • discharge onto slope
    • unknown (test to find out)
  • Landscape pools/ponds/fountains
    • between house and slope
    • behind house
    • not applicable
  • Hot tub(s)/swimming pool(s)
    • between house and slope
    • behind house
    • not applicable
  • Where are tub/pool/pond/fountains drained?
    • Into a tightline drainage system
    • onto slope
    • below slope
    • onto ground
    • unknown (test to find out)

Distance of site features from slope crest:
 



Other resources:
Have you reviewed other information from Ecology in this website series to help you?
(See links section for more information)

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