If overland flow distance is 13.58 km with a 10 m elevation drop to the drain mouth, what is the calculated inlet time___________________?
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Answer: D. 8 hours
Explanation
The standard inlet time formula calculates overland flow duration using length and elevation. Inserting thirteen point five eight kilometers and ten meters drop results in eight hours. This confirms the correct option is exactly eight hours as derived mathematically. Inlet time represents the time required for rainwater to flow across the ground surface. Hydrologists use empirical equations to estimate overland flow travel times in urban basins. Key variables include catchment length surface roughness slope and total elevation drop.
Civil engineers apply inlet time calculations when designing stormwater drainage and sewer networks. Accurate estimates prevent urban flooding by sizing retention structures and conduits properly. Understanding surface flow dynamics helps manage runoff peaks in rapidly developing municipalities. Option A suggests two hours which severely underestimates the long overland travel distance. Option B proposes four hours which fails to account for the gentle slope gradient. Option C gives six hours which still falls short of the true calculated duration.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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