ESM 321 HW #2 Please complete the following problems (engineering paper is recom

Question

ESM 321 HW #2 Please complete the following problems (engineering paper is recommended, although not required) You may submit a print-out from Excel that clearly shows all the work and is properly annotated with comments describing your process. IfI can't easily trace your steps, I won't be able to assign partial credit. Date due: Tues, Feb 27, 2018 in class. No submissions by email. (60 pts available) Concepts to consider: Mass-concentration x volume Net flux inputs-outputs Wet vs dry deposition Calculate volume of rain given rainfall depth and area of watershed ·Residence time into or out of pool . New growth-flux into pool of live Use metric units standing stock / flux Molar masses of P vs. PO are different Average flux = (Total inputs + Total outputs)/2 biomass ·Mg = 10° g Questions 1-3 relate to onc cosystem, and questions 4-5 relate to another one. You may find it helpfal 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 (PO4) concentration in the streamflow was found to average 0.165 mg/L throughout the year, estima streamflow from the Saltzmann Creek watershed in Forest Park. If phosphate (in L) and (b) the total mass of streamwater-exported PO (in kg of PO) leaving the watershed in an average year Month Mean OIcfs Month Mean QIcfsl Oct Nov Dec Jan2.631 Feb Mar 0.493 1.669 2.348 May Jun Jul Au Sep 2.486 1.358 0.500 0,333 2.014

Explanation / Answer

a) First let us change the units of Q from cfs to m3/s, and then calculate Total volume by multiplying Q for each month with number of seconds in a month i.e. 2629743.83 seconds:

Taking the sum of all volumes, we get V for whole year = 1233823.16 m3 =1,233,823,160 L

b) Concentration given = 0.165 mg/L

So, mass = Volume * concentration

= 1,233,823,160 * 0.165

= 203,580,821 mg

= 203,581 kg

Month Mean Q [m3/s] Total Volume (m3) Oct 0.01396 36711.22 Nov 0.04726 124281.69 Dec 0.06648 174825.37 Jan 0.07450 195915.91 Feb 0.06651 174904.26 Mar 0.05703 149974.29 Apr 0.07039 185107.66 May 0.03845 101113.65 Jun 0.01415 37210.87 Jul 0.00942 24772.18 Aug 0.00563 14805.45 Sep 0.00540 14200.61

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