CIVE 486 - Final Exam Sample Problems

CIVE 486 - Final Exam Sample Problems - Exampleproblems...

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CivE 486 Final Exam Prep Example problems 1. (a) Given the following watershed isochrone map and IDF curve, estimate the proper rainfall intensity to be used in the design of a causeway at the outlet of the watershed, given that the causeway should have a probability of failure of less than 20% over its 10 year life span. (b) Given the rainfall intensity and duration from part (a), use the NRCS method to estimate the corresponding total direct runoff from the watershed, in mm, which has a curve number of 50. You may use any justifiable approach for estimating initial abstraction (provided you can justify it). (c) If the hydrograph at right represents the outflow from a 2.5 hour storm with an intensity of 1 mm/hr (with baseflow removed), draw on the same plot what you expect the outflow hydrograph to look like for your design direct runoff calculated in part b (explain your drawing). From this information alone, what do you expect the magnitude of the design flow under the causeway to be? (d) What is your best guess of the size of the watershed, in km 2 ? Show all calculations and defend all assumptions.
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CivE 486 Final Exam Prep 2. (a) A 10cm ripe snowpack at zero degrees Celsius sits atop a silty sand with a saturated hydraulic conductivity of 0.072 m/d, porosity of 0.4, initial saturation of 80%, and estimated wetting front suction of 20 cm. If the clouds break for a 4 hour stint in the afternoon, heating the snowpack at a rate of 50 MJ/m2/d, determine the amount of snowmelt released from snowpack. State any required assumptions for your analysis.
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CIVE 486 - Final Exam Sample Problems - Exampleproblems...

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