APPENDIX 6-A
Table 6A.1 HYDROLOGIC SOIL SERIES FOR SELECTED SOILS IN WASHINGTON STATE
Soil Type
Agnew
Ahl
Aits
Alderwood
Arents, Alderwood
Arents, Everett
Ashoe
Baldhill
Barneston
Baumgard
Beausite
Belfast
Bellingham
Bellingham variant
Boistfort
Bow
Briscot
Buckley
Bunker
Cagey
Carlsborg
Casey
Cassolary
Cathcart
Centralia
Chehalis
Chesaw
Cinebar
Clallam
Clayton
Coastal beaches
Colter
Custer
Custer, Drained
Dabob
Delphi
Dick
Dimal
Dupont
Earlmont
Edgewick
Eld
Elwell
Esquatzel
Everett
Everson
Galvin
Getchell
Giles
Godfrey
Greenwater
Grove
Harstine
Hartnit
Hoh
Puget
Puyallup
Queets
Quilcene
Hydrologic Soil Group
C
B
C
C
B
B
B
B
C
B
B
C
D
C
B
D
D
C
B
C
A
D
C
B
B
B
A
B
C
B
variable
C
D
C
C
D
A
D
D
C
C
B
B
B
A
D
D
A
B
D
A
C
C
C
B
D
B
B
C
6A-1
Soil Type
Hoko
Hoodsport
Hoogdal
Hoypus
Huel
Indianola
Jonas
Jumpe
Kalaloch
Kapowsin
Katula
Kilchis
Kitsap
Klaus
Klone
Lates
Lebam
Lummi
Lynnwood
Lystair
Mal
Manley
Mashel
Maytown
McKenna
McMurray
Melbourne
Menzel
Mixed Alluvial
Molson
Mukilteo
Naff
Nargar
National
Neilton
Newberg
Nisqually
Nooksack
Norma
Ogarty
Olete
Olomount
Olympic
Orcas
Oridia
Orting
Oso
Ovall
Pastik
Pheeney
Phelan
Pilchuck
Potchub
Poulsbo
Prather
Solleks
Spana
Spanaway
Springdale
Hydrologic Soil Group
C
C
C
A
A
A
B
B
C
C/D
C
C
C
C
B
C
B
D
A
B
C
B
B
C
D
D
B
B
variable
B
C/D
B
A
B
A
B
B
C
C/D
C
C
C
B
D
D
D
C
C
C
C
D
C
C
C
C
C
D
A/B
B
APPENDIX 6-A
Table 6A.1 HYDROLOGIC SOIL SERIES FOR SELECTED SOILS IN WASHINGTON STATE
Soil Type
Ragnar
Rainier
Raught
Reed
Reed, Drained or Protected
Renton
Republic
Riverwash
Rober
Salal
Salkum
Sammamish
San Juan
Scamman
Schneider
Seattle
Sekiu
Semiahmoo
Shalcar
Shano
Shelton
Si
Sinclair
Skipopa
Skykomish
Snahopish
Snohomish
Solduc
Hydrologic Soil Group
B
C
B
D
C
D
B
variable
C
C
B
D
A
D
B
D
D
D
D
B
C
C
C
D
B
B
D
B
Soil Type
Sulsavar
Sultan
Sultan variant
Sumas
Swantown
Tacoma
Tanwax
Tanwax, Drained
Tealwhit
Tenino
Tisch
Tokul
Townsend
Triton
Tukwila
Tukey
Urbana
Vailton
Verlot
Wapato
Warden
Whidbey
Wilkeson
Winston
Woodinville
Yelm
Zynbar
Hydrologic Soil Group
B
C
B
C
D
D
D
C
D
C
D
C
C
D
D
C
C
B
C
D
B
C
B
A
B
C
B
Hydrologic Soil Group Classifications, as Defined by the Soil Conservation Service:
A = (Low runoff potential) Soils having low runoff potential and high infiltration rates, even when thoroughly wetted. They
consist chiefly of deep, well to excessively drained sands or gravels and have a high rate of water transmission (greater than
0.30 in/hr.).
B = (Moderately low runoff potential). Soils having moderate infiltration rates when thoroughly wetted and consist chiefly of
moderately deep to deep, moderately well to well drained soils with moderately fine to moderately coarse textures. These
soils have a moderate rate of water transmission (0.15-0.3 in/hr.).
C = (Moderately high runoff potential). Soils having low infiltration rates when thoroughly wetted and consist chiefly of soils
with a layer that impedes downward movement of water and soils with moderately fine to fine textures. These soils have a
low rate of water transmission (0.05-0.15 in/hr.).
D = (High runoff potential). Soils having high runoff potential. They have very low infiltration rates when thoroughly wetted
and consist chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils with a hardpan
or clay layer at or near the surface, and shallow soils over nearly impervious material. These soils have a very low rate of
water transmission (0-0.05 in/hr.).
* = From SCS, TR-55, Second Edition, June 1986, Exhibit A-1. Revisions made from SCS, Soil Interpretation Record, Form #5,
September 1988 and various county soil surveys.
6A-2