How might you be contributing directly or indirectlyto the annual dead zone that forms in the Gulf ofMexico (Core Case Study)? What are three things youcould do to reduce your impact?

A city’s sewage outfall flows 40 ft3/s of sewage with a BOD concentration of 30 mg/L anda DO of 1.5 mg / L into a small river that has a flow rate of 280 ft3/s and a velocity of 1.1 ft /s.The river has a natural BOD of 3.5 mg/L and at this time of year the DO level is 7 mg/L. Giventhe water temperature this time of year the DO saturation is 8.5 mg / L. Given a deoxygenationcoefficient of 0.59 day-1 and a rearation coefficient of 0.70 day-1, answer the following:a. what is the basic assumption we make regarded the mixing of waste into the river?b. calculate Do amd Lo just downstream from the outfallc. calculate the tiem and distance when DO is a minimumd. calculate the minimum DOe. Find the DO 10 miles downstream.

What if we were able to restore some critical salmon habitat, like the forests surrounding the spawning streams? To test this restoration, increase K to 40,000 fish. What would that do to the MSY value? [ Select ] Does this mean you would be able to harvest more or less fish? [ Select ]

answer number 10 please