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Title: REPORT ON HIGHWAY GRADING AND DRAINAGE
Accession Number: 00205047
Record Type: Component
Abstract: IN CONTRAST TO THE OLD IDEA OF CONCENTRATING RUNOFF IN DITCHES AND TRYING TO GET THE WATER OFF THE RIGHT- OF-WAY AS FAST AS POSSIBLE, TODAY'S CONCEPT OF DRAINAGE IS RECOGNITION OF THE NEED FOR DOING EVERYTHING POSSIBLE TO KEEP THE WATER DISPERSED AND TO REDUCE EROSION BY SLOWING DOWN THE MOVEMENT OF WATER TO A VELOCITY THAT CAN BE HANDLED. MACHINE METHODS OF FLATTENING, ROUNDING, AND MULCHING OF EARTH SLOPES ARE NOW USED AS BASIC OPERATIONS IN A LARGE NUMBER OF STATES. THESE AND OTHER RELATED CONSERVATION AND CONSTRUCTION MEASURES ARE BEING APPLIED BY HIGHWAY ENGINEERS FACED WITH SUCH PROBLEMS AS PUMPING OF PAVEMENTS, LANDSLIDES, SNOWDRIFTING, AND RELATED MATTERS IN THE ECONOMY OF HIGHWAY OPERATIONS AND MAINTENANCE. TWO THINGS CONTROL THE AMOUNT OF EROSION IN CHANNELS: (1) THE DEPTH OF THE WATER; AND (2) THE SLOPE OR PROFILE AT WHICH THE CHANNEL IS PLACED. IF THE SLOPE IS FIXED, IT IS THE DEPTH OF THE WATER THAT CAUSES THE SOIL PARTICLES TO MOVE. ANYTHING THAT SPREADS THE WATER OUT AND MAKES THE GUTTER SHALLOWER WILL REDUCE EROSION. /AUTHOR/
Supplemental Notes: No 222, pp 12-14. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
Authors: Simonson, W HPublication Date: 1952
Serial:
Highway Research Board Roadside Development Committee Reports
Publisher: Highway Research Board Media Type: Digital/other
TRT Terms: Old TRIS Terms: Subject Areas: Design; Environment; Highways; Hydraulics and Hydrology
Files: TRIS, TRB
Created Date: Nov 15 1971 12:00AM
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