Questions 1-3 relate to one ccosystem, and questions 4-5 relate to another onc.
ID: 287893 • Letter: Q
Question
Questions 1-3 relate to one ccosystem, and questions 4-5 relate to another onc. You may find it helpful to start out by drawing a box model that shows inputs, outputs, and storage in each system, to help you conceptualize cach system. 1. (10 points) Below you are given the average monthly streamflow from the Saltzmann Creck watershed in Forest Park. If phosphat (PO) concentration in the streamflow was found to average 0.165 mg/L throughout the year, estimate (a) the total volume of water (in L) and (b) the total mass of streamwater-exported PO (in kg of PO) leaving the watershed in an average ycar Month Mean QIcfs Month Mean Qlcfsl Oct Nov Dec Jan Feb Mar 0.493 1.669 2.348 2.631 2.349 2.014 Apr May Jun Jul Aug Sep 2.486 1.358 0.500 0.333 0.199 0.191Explanation / Answer
First step is to find the year-average. For that add each month's value and divide by 12:
Therefore, the mean streamflow for the given year from the Saltzmann Creek watershed is:
a) Q = 1.381 cfs
WKT, 1 cfs = 28.317 L/s
Therefore, Q = 1.381 * 28.317 = 39.106 L/s
So, on an average if the streamflow is 39.106 L per second then the yearly total flow in L would be this value multiplied by 86400s in a day and 365 days a year:
V = Q * time = 39.106 * 86400 * 365 = 1233246816 L = 1.23 billion L
b) If average phosphate concentration is 0.165 mg/L, then total mass of streamwater exported PO43-,
Total mass of phosphate = Concentration * volume = 0.165 * 1233246816 = 203485724.64 mg = 203.5 kg
Month Mean Q (cfs) Oct 0.493 Nov 1.669 Dec 2.348 Jan 2.631 Feb 2.349 Mar 2.014 Apr 2.486 May 1.358 Jun 0.5 Jul 0.333 Aug 0.199 Sep 0.191 Average 1.381Related Questions
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