Deriving Unit Hydrograph

Unit hydrograph is an effective hydrograph that tells us how a catchment would respond to a unit rainfall excess under a storm with duration of d-hour. When deriving unit hydrograph, we may use hydrographs from a few isolated storms with approximately the same duration, preferably from 0.9d to 1.1d. In our worked example, we have two hydrographs obtained from storm with duration of 6.5 and 6 hours. The catchment area is 378km2. First, we implement straight line method to conduct base flow separation. Then, we produce direct runoff hydrograph by isolating the hydrograph from base flow we determined earlier. Afterwards, we need to find the effective rainfall depth. This value can help us to scale down the hydrograph to unit hydrograph at their own timeframe. To produce the final unit hydrograph for storm duration of 6 hours, we can take the average of the ordinates of the unit hydrograph we developed from the input hydrograph. If you find this video helpful, please like this video and share it to your friend. Subscribe to our channel for more insightful sharing in civil engineering. ********** Reach us on various platforms: Website: http://www.yfilios-solution.com/ Patreon: https://www.patreon.com/yfilios Social Media: https://linktr.ee/yfilios ********** Yfilios Solution has published several books that may be useful to you, so make sure you check them out here! Blank Manual Calculation Sheet (50 pages): https://www.amazon.com/dp/B09RG1NHRB Blank Manual Calculation Sheet (100 pages): https://www.amazon.com/dp/B09RNWBBPL Blank Manual Calculation Sheet (200 pages): https://www.amazon.com/dp/B09RP2NBRB Beam Formula Calculation Sheet (100 pages): https://www.amazon.com/dp/B0BVCWTFW3 Beam Formula Calculation Sheet (200 pages): https://www.amazon.com/dp/B0BW2ZSL3M Analysis of Statically Indeterminate Structures - Worked Examples: http://www.yfilios-solution.com/p/analysis-of-statically-indeterminate.html Reinforced Concrete Design Workflow to Eurocode 2: http://www.yfilios-solution.com/p/reinforced-concrete-design-workflow-to.html Design Data to Malaysian Standards for Civil Engineers: http://www.yfilios-solution.com/p/design-data-to-malaysian-standards-for.html Formulation and Design Data for Civil Engineering: http://www.yfilios-solution.com/p/formulation-and-design-data-for-civil.html Circular Column Design Charts to Eurocode 2: http://www.yfilios-solution.com/p/circular-column-design-charts-to.html ********** Music Credit: 1. Nine Lives - Unicorn Heads (https://www.youtube.com/channel/UCbDplVvtIq05AdyYKjVSUIw) ********** References: 1. Subramanya, K. (2013). Engineering Hydrology (4th ed). McGraw Hill Education (India). New Delhi.