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Z 2135.6 L811g Spring 1993 c.l OKLAHOMA LOCAL GOVERNMENT NEWS PUBLISHED QUARTERLY BY THE CENTER FOR LOCAL GOVERNMENT TECHNOLOGY, OKLAHOMA STATE UNIVERSITY, SPONSORED JOINTLY BY THE FEDERAL HIGHWAY ADMINISTRATION, THE OKLAHOMA DEPARTMENT OF TRANSPORTATION AND THE OKLAHOMA COMMISSION ON COUNTY GOVERNMENT PERSONNEL, EDUCATION AND TRAINING. 308 CITD Stillwater, OK 74078 405-744-6049 Spring 1993 edited by Douglas Wright TEN COMMANDMENTS OF A GOOD ROAD Here are ten basic tips to help maintain and keep your roads in good condition. I. Get water away from the road Drainage cannot be overemphasized in road construction and maintenance. Water affects the entire serviceability of a road. Too much water in the base material weakens the road. Water allowed to remain on top of a gravel or blacktopped road weakens the surface, and, combined with traffic, causes potholes and cracking. If improperly channeled, water causes soil erosion and a breakdown of pavement edges. Whether it is mud in the spring or frost heaves in the winter, the presence of water in roads is nothing but trouble. A good surface drainage system is the best way to lessen water damage on a road. Proper surface drainage prevents water from infiltrating the pavement surface and removes water from driving lanes in a constant thin sheet to the side ditches, which carry the water away from the roadway. A surface drainage system has four main components: road crown, shoulders, ditches and culverts. The road crown, or super-elevation of the road surface, allows water to run off to the side ditches. Shoulders are an extension of the road surface and allow for the continued flow of water to the ditches. Ditches are used to carry water away from the roadway. They need to be kept clean and protected from erosion. Water left in the ditch can sometimes leak back into the base. Water collected and carried in the ditch has to be directed away from the roadway at frequent intervals, sometimes using culvert pipe. Culverts usually channel water from one side of the road to the other, helping to control the flow of water and slowing it down to reduce erosion. Road managers are guided by the principles that water runs downhill, that water needs outlets at the bottom of all grades and that puddles mean problems. Except for some water needed for soil compaction, dust control and vegetation, water is the roadway manager's worst enemy. II. Build on a firm foundation A highway wears out from the top, but it falls apart from the bottom. This is another way of saying that the road base determines the service-life of a road. The base supports everything above it, including traffic. Without adequate support, the road will deteriorate rapidly. A good road requires a suitable foundation composed of stable material. A road material is stable if (continued on page 2)
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Title | Page 01 |
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Full text | Z 2135.6 L811g Spring 1993 c.l OKLAHOMA LOCAL GOVERNMENT NEWS PUBLISHED QUARTERLY BY THE CENTER FOR LOCAL GOVERNMENT TECHNOLOGY, OKLAHOMA STATE UNIVERSITY, SPONSORED JOINTLY BY THE FEDERAL HIGHWAY ADMINISTRATION, THE OKLAHOMA DEPARTMENT OF TRANSPORTATION AND THE OKLAHOMA COMMISSION ON COUNTY GOVERNMENT PERSONNEL, EDUCATION AND TRAINING. 308 CITD Stillwater, OK 74078 405-744-6049 Spring 1993 edited by Douglas Wright TEN COMMANDMENTS OF A GOOD ROAD Here are ten basic tips to help maintain and keep your roads in good condition. I. Get water away from the road Drainage cannot be overemphasized in road construction and maintenance. Water affects the entire serviceability of a road. Too much water in the base material weakens the road. Water allowed to remain on top of a gravel or blacktopped road weakens the surface, and, combined with traffic, causes potholes and cracking. If improperly channeled, water causes soil erosion and a breakdown of pavement edges. Whether it is mud in the spring or frost heaves in the winter, the presence of water in roads is nothing but trouble. A good surface drainage system is the best way to lessen water damage on a road. Proper surface drainage prevents water from infiltrating the pavement surface and removes water from driving lanes in a constant thin sheet to the side ditches, which carry the water away from the roadway. A surface drainage system has four main components: road crown, shoulders, ditches and culverts. The road crown, or super-elevation of the road surface, allows water to run off to the side ditches. Shoulders are an extension of the road surface and allow for the continued flow of water to the ditches. Ditches are used to carry water away from the roadway. They need to be kept clean and protected from erosion. Water left in the ditch can sometimes leak back into the base. Water collected and carried in the ditch has to be directed away from the roadway at frequent intervals, sometimes using culvert pipe. Culverts usually channel water from one side of the road to the other, helping to control the flow of water and slowing it down to reduce erosion. Road managers are guided by the principles that water runs downhill, that water needs outlets at the bottom of all grades and that puddles mean problems. Except for some water needed for soil compaction, dust control and vegetation, water is the roadway manager's worst enemy. II. Build on a firm foundation A highway wears out from the top, but it falls apart from the bottom. This is another way of saying that the road base determines the service-life of a road. The base supports everything above it, including traffic. Without adequate support, the road will deteriorate rapidly. A good road requires a suitable foundation composed of stable material. A road material is stable if (continued on page 2) |
Date created | 2013-03-11 |
Date modified | 2013-03-11 |