After many years of flooding Columbia University new campus, the NYC planners ha

Question

After many years of flooding Columbia University new campus, the NYC planners have decided it is time to construct a unit hydrograph that represents the rate of discharge at the new campus per Icm of runoff generated over the Hudson river The data below shows the flow at the new campus generated by runoff produced by the Hudson River Basin (A 50km2) for a storm last vear Time (hr) Flow (m/s) 14.16 33.98 63.71 82.68 75.61 58.55 40.49 31.15 25.77 22.09 19.26 16.99 15.29 14.44 14.16 12 15 18 21 24 30 36 39 42 . a) Plot the hydrograph of the storm above. b) Calculate the total volume of overland runoff produced by the storm above by assuming a baseflow of 14.16 m . . e) What is the depth of runoff for this storm? d) Construct and plot a Unit Hydrograph for the Hudson River Basin Now using the amount of runoff calculated from problem 2, and assuming an instantaneous pulse of rainfall falling at 6am on both days: e) Plot the hydrograph for Saturday's storm f) Plot the hydrograph for Sunday's storm g) Plot the total hydrograph h) In calculating the runoff in problem 2 we assumed that all of the Hudson River Basin has the same soil and infiltration characteristics. Is this a valid assumption? Do you think we have under-estimated/over-estimated runoff? How could be adjust our calculations to take this into account? (No numbers, just a brief paragraph)

Explanation / Answer

ANSWER:

A river basin is the land that water flows across or under on its way to a river. Just as a bathtub catches all of the water that falls within its sides, a river basin sends all of the water falling within it to a central river and out to an estuary or to the ocean.

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