FDC Homework #6

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University of South Florida *

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Geography

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Dec 6, 2023

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docx

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Environmental Hydrology Homework: #6 Flow Duration Curves Points: 80 PART I: You will use the USGS data you downloaded. 1. Create individual flow duration curves for the sites you downloaded in Homework 3 using the method described in the PowerPoint slides ( 20 points ). done 2. Were there any data you had to screen? How did you screen the data and why? ( 20 points ) Yes, in Worthington springs we observed a discharge with a measurement of 0 cfs a handful of times and in order to compute this data correctly, those values had to be screened and omitted as being outliers. 3. Plot up the flow duration curves on the same graph in Excel for comparison (Pro-tip: use scatter plot and create a line) ( 20 points ) Copy and paste your graph below 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 10000 100000 FLOW DURATION Worthington Ft White Hildreth Probability of exceedance (%) Q (cfs) 4. From the flow duration curves, which site do you think has more groundwater contribution? Why do you think that is? ( 20 points ) As discussed in the PowerPoint, when graphing FDC’s a line observed with a shallower slope has more groundwater present when compared to its competitors. In our case, when considering the data from our three locations, it would appear that Hildreth has more ground water contribution with its shallower slope. The shallower slope means Hildreth has a consistent
amount of discharge with a relatively high probability of exceedance making its flow duration one of the highest observed. 5. What impact do you think increased groundwater has on flow dynamics in a river? To be more specific, what do you think causes the behavior observed in the FDC when groundwater is more influential on the system? (+20 bonus ). Groundwater tables release water into rivers and streams as they rise in the winter and spring, either directly through the riverbeds and banks or inadvertently through springs. As for when the graph in the fdc almost plateaus when there is more groundwater present, this follows suit. More groundwater in a system keeps the discharge level at a more constant rate much like the probability of exceedance because there is more available groundwater to be able to contribute to enter the riverways and continuously influence the flow dynamics seen there. (More water available to enter the river and it does, keeping the q and p measurements at a more constant rate instead of a decline like we see in Worthington).
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