How to calculate Time of Concentration Tc in HEC HMS
Автор: BharatHydro
Загружено: 2025-04-05
Просмотров: 1037
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🌧️💡 How to Calculate Time of Concentration (Tc) in HEC-HMS 💡🌧️
In hydrologic modeling, Time of Concentration (Tc) is a crucial parameter that defines how quickly runoff travels from the most distant point in a watershed to the outlet. Accurately estimating Tc helps in simulating realistic peak flows and hydrographs in HEC-HMS.
🔍 In this post/video, I walk through:
✅ What Time of Concentration (Tc) is
✅ Different empirical methods (Kirpich, NRCS TR-55, etc.)
✅ Which parameters are needed
✅ How to use the Expression Calculator in HEC-HMS to compute Tc
✅ Best practices for selecting slope and flow path length
💡 For example, using the Kirpich method:
📐 Tip: Use the Longest Flowpath Slope, not basin slope, when applying this method.
🎯 Whether you're modeling urban drainage or natural watersheds, knowing how to correctly estimate Tc can greatly improve your simulation accuracy.
🔗 Check out the tutorial and drop your questions or thoughts below!
#HECHMS #Hydrology #WaterResources #TimeOfConcentration #ClarkUnitHydrograph #HydrologicModeling #CivilEngineering #WatershedManagement #KirpichMethod #TR55 #Stormwater
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