Transcription of Basic Hydrology Time of Concentration Methodology
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Basic Hydrology time of Concentration MethodologyBy: Paul Schiariti, , CPESCM ercer County Soil Conservation DistrictWhat is the time of Concentration ?The time it takes for runoff to travel from the most hydraulically distant point in the watershed to a point of is the most Hydraulically Distant Point in the watershed?Is it a hydraulic distance or a hydraulic time ?Is there a difference?Hydraulically Most Distant Point?Path A is 1000 ft. long with a time of Concentration = HoursPath B is 750 ft. long with a time of Concentration = HoursWhere is the Correct TC Flow Path?What is the difference in TCfor both Flow Paths?Path B TC= Hours, Path A TC= HoursWhat is the difference in QPEAKfor the two Flow Paths & which is correct?Approximately 9 Acres of the 10 Acres flows similar to Path B , therefore this path is representative of 90% of the drainage area, and realistically better represents the watershedThe use of TCFlow Path B represents an under-estimation of QPEAKby 19 to 20%.
What is the Time of Concentration? The time it takes for runoff to travel from the most hydraulically distant point in the watershed to a point of interest.
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