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ESTIMATION OF IMPERVIOUS CURVE NUMBERS
| 题名： | ESTIMATION OF IMPERVIOUS CURVE NUMBERS |
| 作者： | Ashok Pandit, Ph.D., P.E. Howell H. Heck, Ph.D., P.E. Marwan E. Jubran |
| 关键词： | perv；numb；matio；stim；mber；distribution；collection；measurement；presence；change |
| 摘要： | A water supply and water distribution system were designed and constructed to simulate rainfall on 50 ft by 20 ft asphalt and concrete pavements. A water collection system was also designed and constructed to collect the runoff from the pavements. The entire system was designed in a manner so that it can be mounted on a truck and ported to other locations. A total of 64 experiments, many of which were duplicated, were conducted on the pavements and the data were analyzed to determine the curve number for asphalt and concrete. The effects of pavement slope, rainfall intensity, and rainfall duration on the curve number value were also examined. It was determined that the curve number for concrete is essentially 100 and its value for asphalt ranges from 97 to 100. However, it was found that 1) cracks in concrete can lower the curve number values, and 2) the presence of just a small '"porous" area in the asphalt can considerably reduce the curve number. The two above-mentioned phenomena are even more likely at relatively low rainfall intensities. Thus, curve number measurements under "field conditions" may provide significant lower values. Changes in rainfall intensity, from 0.25in/hr to 4.00in/hr, and changes in duration, from 0.25hr to 4.00hr, did not change the curve number value. Also, changes in pavement slopes from approximately 2% to 5%, did not change the curve number value. |
| 报告类型： | 科技报告 |
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