TR-55 Curve Number Tables - Washington State Department of ...

APPENDIX 4B

TR-55 Curve Number Tables

Appendix 4B

List of Tables

Table 4B-1 Hydrologic soil series for selected soils in Washington State. ................. 4B-1

Table 4B-2 Runoff curve numbers for selected agricultural, suburban, and rural areas

(western Washington). ............................................................................. 4B-4

Table 4B-3 Runoff curve numbers for selected agricultural, suburban, and rural areas

(eastern Washington). .............................................................................. 4B-5

Table 4B-4 Curve number conversions for different antecedent moisture conditions

(case Ia = 0.2 S). ........................................................................................ 4B-6

Table 4B-5 ¡°n¡± and ¡°k¡± values used in time calculations for hydrographs. ................ 4B-7

Table 4B-6 Values of the roughness coefficient, ¡°n.¡± ................................................. 4B-8

WSDOT Highway Runoff Manual M 31-16.04

April 2014

Page 4B-i

List of Tables

Page 4B-ii

Appendix 4B

WSDOT Highway Runoff Manual M 31-16.04

April 2014

Appendix 4B

Table 4B-1

TR-55 Curve Number Tables

Hydrologic soil series for selected soils in Washington State.

Soil Type

Agnew

Ahl

Aits

Alderwood

Arents, Alderwood

Arents, Everett

Ashoe

Athena

Baldhill

Barneston

Baumgard

Beausite

Belfast

Bellingham

Bellingham variant

Bernhill

Boistfort

Bong

Bonner

Bow

Brickel

Bridgeson

Briscot

Buckley

Bunker

Cagey

Caldwell

Carlsborg

Casey

Cassolary

Cathcart

Cedonia

Centralia

Chehalis

Cheney

Chesaw

Cinebar

Clallam

Clayton

Coastal beaches

Cocolalla

Colter

Custer

Custer, Drained

Dabob

Dearyton

Delphi

Dick

Larkin

Latah

Lates

Hydrologic Soil Group

C

B

C

C

B

B

B

B

B

C

B

B

C

D

C

B

B

A

B

D

C

D

D

C

B

C

C

A

D

C

B

B

B

B

B

A

B

C

B

variable

D

C

D

C

C

C

D

A

B

D

C

WSDOT Highway Runoff Manual M 31-16.04

April 2014

Soil Type

Dimal

Dragoon

Dupont

Earlmont

Edgewick

Eld

Eloika

Elwell

Emdent

Esquatzel

Everett

Everson

Freeman

Galvin

Garfield

Garrison

Getchell

Giles

Glenrose

Godfrey

Green Bluff

Greenwater

Grove

Hagen

Hardesty

Harstine

Hartnit

Hesseltine

Hoh

Hoko

Hoodsport

Hoogdal

Hoypus

Huel

Indianola

Jonas

Jumpe

Kalaloch

Kapowsin

Katula

Kilchis

Kitsap

Klaus

Klone

Konner

Lakesol

Laketon

Lance

Poulsbo

Prather

Puget

Hydrologic Soil Group

D

C

D

C

C

B

B

B

D

B

A

D

C

D

C

B

A

B

B

D

B

A

C

B

B

C

C

B

B

C

C

C

A

A

A

B

B

C

C/D

C

C

C

C

B

D

B

C

B

C

C

D

Page 4B-1

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