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.


Pipes


Sub-surface Drainage

  • French Mattress (297 KB): French mattresses allow water to pass under a road through coarse stone. (2/13)

  • Underdrains (97 KB): General information on underdrain and where and why to use it. (4/06)

  • Constructed Stone Underdrains (146 KB): Walkthrough of creating your own underdrain with of perforated pipe, clean stone, and fabric. (4/06)


Streams

  • Corman Clearwater Crossing (208 KB): Better stream crossings by draining water away from the stream. (3/06)

  • High-Water Bypass (468 KB): Hardened overflow area where water can safely flow over road during extreme events. (3/06)


Driving Surface Aggregate

  • 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.

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


Surface Drainage

  • Crown and Cross-Slope (138 KB): Different types of crown and proper cross-slope for unpaved roads. (4/04)

  • Grade Breaks (210 KB): Grade breaks are surface drainage features that stop concentrated flow and road erosion. (3/04)

  • Broad-Based Dips (1.6 MB): Surface dips that transport water across the surface of a low volume road. (9/08)

  • Conveyor Belt Diversion (260 KB): Used conveyor belts embedded in the road to prevent water from flowing down the road. (9/09)

  • Surface Maintenance (171 KB): General information on maintaining unpaved road surfaces. (4/7/04)

  • The Road Profile (106 KB): The importance of the road elevation relative to the surrounding terrain. (7/04)

  • Raising the Road Profile (121 KB): Raising the elevation of the road to achieve better drainage. (7/04)

  • Tire Bales as Road Fill (152 KB): Use of baled waste tires to fill entrenched roads and restore natureal drainage. (4/07)


Road Surface Maintenance


Road Banks

  • Bank Benches (83 KB): Steps created in a road bank to slow and control the flow of water over the bank.

  • "Through-the-bank" Pipes (128 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)