drainage

WA-RD 422.1
Authors: 
C. Michael Miner.
Originator: 
Washington (State). Dept. of Transportation. Materials Laboratory.
Publication Date: 
Thursday, August 1, 1996
WA-RD 344.1
Authors: 
Keith W. Anderson.
Originator: 
Washington (State). Dept. of Transportation. Materials Laboratory.
Publication Date: 
Friday, April 1, 1994
WA-RD 280.1
Authors: 
Robert D. Holtz, Martin W. Page.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Sunday, March 31, 1991
WA-RD 272.1
Authors: 
Keith Anderson, Robert Murray.
Originator: 
Washington (State). Dept. of Transportation.
Publication Date: 
Thursday, April 30, 1992
WA-RD 144.1
Authors: 
Robert D. Strombom.
Originator: 
Fujiki and Associates, Inc.
Publication Date: 
Monday, June 1, 1987
M 23-03
Originator: 
Design Office, Engineering and Regional Operations Division
Publication Date: 
Wednesday, March 1, 2006