Unit Hydrograph Theory - Part 2

[@rezamaharlooei2400]

Really enjoyed your explanations on UH. In vibration theory we also have unit impulse which uses the same approach to verify it and then use it to find the response of a system (PDE) to this unit impulse.

[@simulationnation3105]

I’m really new to hydrology and I wanna learn this. How did you come up with the ordinates of the 1 unit hydrograph. You already have them tabulated but was not explained where they came from. Thanks

[@grinfacelaxu]

Nice!!

[@maryn392]

thank you so much. what happens if the duration changes? like we have the unit hydro for 20 min, what happens if the Q for 30min or 40 min is asked?

[@HydroMohsen]

I'll record a video on that!

[@inazerega]

What about an example using the superposition postulate for a different duration rainfall?

[@brandonloucks5702]

Delta t looked to be 30 minutes. But you are saying it us 20 minutes? I feel like Im missing something....

[@simulationnation3105]

I was confused with this one too….

[@asotayousafzai]

Delta t is the duration of rainfall that generates surface runoff (you can think of it as time in phi index, where rainfall intensity is greater than infiltration capacity), so this particular Unit Hydrograph represents the response of a watershed with a rainstorm event which was effective for 20 minutes duration only in generating runoff. The time difference of 30 minutes between different observation points for the unit hydrograph is not delta t and has no relationship with the duration of the rainstorm event.

[@dandabear118]

It's not a unit hydrograph. 2 km^2 is two thousand meters squared. You wrote 2x10^6, which is two MILLION.

[@HydroMohsen]

Do the math again! ;) tinyurl.com/kj28hbn9