Civil Engineering PE All-in-One Exam Guide by Indranil Goswami

Civil Engineering PE All-in-One Exam Guide by Indranil Goswami

Author:Indranil Goswami
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2020-03-15T00:00:00+00:00


The intensity (typical units inches/per hour) may be estimated from historical data presented in the form of intensity-duration-frequency curves. The rational coefficient C is a single number representing land use and land cover for the watershed. Table 304.10 shows typical values of the runoff coefficient.

Table 304.10 Values of Runoff Coefficient C, for Use in the Rational Method

Example 304.5

Land use classification for a watershed in the western United States is summarized in the table below. The longest flow path in the watershed to the storm sewer is 337 yd and the average slope is 1.3%. What is the flow to the storm sewer resulting from a 10-year storm?



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