Informational and Technical Bulletins

Library of Center publications detailing specific "Environmentally Sensitive Road Maintenance" Practices. Each bulletin is grouped by topic area and is specific to one practice.


  • Headwalls and Endwalls (423 KB): General information on the benefits of headwalls and endwalls at pipes (6/18)

  • Natural Stone Headwalls (169 KB): Details on how to construct headwalls and endwalls out of native stone (6/04)

  • Pipes: An Overview (70.9 KB): General information on both stream and cross pipes (10/06)

  • Crosspipe Installation (364 KB): Important considerations and a walkthrough of a typical crosspipe installation. (6/18)

  • Shallow Crosspipe Installation (519 KB): Installing pipes based on outlet elevation, not road elevation, to eliminate outlet trenches. (6/18)

Sub-surface Drainage

  • French Mattress (297 KB): French mattresses allow water to pass under a road through coarse stone. (3/13)

  • Underdrains (96 KB): General information on underdrain and where and why to use it. (4/06)

  • Constructed Stone Underdrains (145 KB): Walkthrough of creating your own underdrain with of perforated pipe, clean stone, and fabric. (4/06)


  • Corman Clearwater Crossing (207 KB): Better stream crossings by draining water away from the stream. (3/06)

  • High-Water Bypass (467 KB): Hardened overflow area where water can safely flow over road during extreme events. (3/06)

Driving Surface Aggregate (DSA)

  • DSA (508 KB): A summary of the Center-developed DSA. Includes material specification, sampling and testing, preparation for placement, placement, compaction, maintenance, and other considerations. (7/17)

  • Road Aggregates 101 (401 KB): A summary of size, gradation, and typical use for some of the more common aggregates for road maintenance in Pennsylvania. Includes course aggregates and rip-rap.

  • Trail Surface Aggregate and general Aggregate Information: Visit the DSA information page

Surface Drainage

  • Surface Drainage Practices (338 KB): Road maintenance features designed to shed water from the travelway, including crown and cross-slope, grade breaks, and broad-based dips. (6/18)

  • Crown and Cross-Slope (137 KB): Different types of crown and proper cross-slope for unpaved roads. (1/05)

  • Grade Breaks (209 KB): Grade breaks are surface drainage features that stop concentrated flow and road erosion. (2/04)

  • Broad-Based Dips (1.65 MB): Surface dips that transport water across the surface of a low volume road. (9/08)

  • Conveyor Belt Diversion (255 KB): Used conveyor belts embedded in the road to prevent water from flowing down the road. (9/09)

  • Surface Maintenance (170 KB): General information on maintaining unpaved road surfaces. (1/05)

  • The Road Profile (212 KB): The importance of the road elevation relative to the surrounding terrain. (12/04)

  • Raising the Road Profile (120 KB): Raising the elevation of the road to achieve better drainage. (1/05)

  • Tire Bales as Road Fill (151 KB): Use of baled waste tires to fill entrenched roads and restore natureal drainage. (8/06)

Road Surface Maintenance

Road Banks

  • Bank Benches (224 KB): Steps created in a road bank to slow and control the flow of water over the bank. (6/18)

  • "Through-the-Bank" Pipes (127 KB): A pipe placed through the downhill road bank to get water out of the road profile. (10/06)

Dust Monitoring

  • Real-time Dust Monitoring (615 KB): Informational bulletin about dust monitoring with a vehicle-mounted monitoring system. (2/16)

Photo Tips

  • DGLVR Photo Tips (488 KB): Informational bulletin for taking more effective project photos for use in education and outreach efforts for the Program. (9/17)