Is this level dangerous to the fish population

Reference no: EM13540138

A lake has a volume of 750,000 m3 (dimensions 15 m deep, 100 m wide, and 500 m long) and behaves as two completly mixed cells. Cell 1 makes up 40% of the lake ( dimensions 15 m deep, 100 m wide, and 200 m long) cell 2 makes up 60% of the lake (dimensions 15 m deep, 100 m wide, and 300 m long). the flow into the lake is from is from a stream is 300 m3/d andthe flow into the lake from runoff averages 20 m3/d. The lake is used for fishing by the local residents but the pesticides from local farms may damage the fish population. the stream and runoffboth carry pesticides from the local farms. Assume the runoff enters the lake uniformly around the edges. The stream has a concentration of 0.2 g/m3 and the run off has a concentration of 0.5 g/m3. the pesticide decays at a rate of 0.0001/d and is known to be toxic to fish at a concentration of 0.05 g/m3. Neglecting the the width of the streams, the lake has a permieter of 1200 m (500 m + 500 m +100 m + 100 m). So the lake recieves 20 m3/day over 1200 m perimeter. Now compute the percentages of the total runoff going into cell 1 and cell 2 based on the percentages of the perimeter each recieves runoff from.

Using the completly mixed model, estimate the pesticide concetration in the lake. Is this level dangerous to the fish population?

Reference no: EM13540138

Questions Cloud

Find the stress in the cable when the truck comes : A tow truck is using a cable to pull a car up a 15 degree hill. If the car weighs 4000 lbs and the cable has a diameter of .75 inches, find the stress in the cable when the truck comes to a stop while on the hill. Ignore friction between the car and ..

Will the pesticides threaten the fish population during the : In the summer, the density at the top of the lake is 997 kg/m3, and at the bottom is 1000 kg/m3. Would you predict stratification to be present, and if so assume an epilimnion depth of 4m. Will the pesticides threaten the fish population during the s..

How fast will the sleeve slide down the rod : A sleeve 30 cm long encases a vertical rod 2.5 cm in diameter with uniform radial clearance of 0.005 cm. when the sleeve and the rod are immersed in a pool of oil with dynamic viscosity

Select the required commercial size of the rod required to : Two forces are applied as shown to hook support. Knowing that the magnitude of P is 35 N, determine by trigonometry (a) the required angle a if the resultant R of the two forces applied to the support is to be horizontal, (b) the corresponding magnit..

Is this level dangerous to the fish population : A lake has a volume of 750,000 m3 (dimensions 15 m deep, 100 m wide, and 500 m long) and behaves as two completly mixed cells. Cell 1 makes up 40% of the lake ( dimensions 15 m deep, 100 m wide, and 200 m long) cell 2 makes up 60% of the lake (dimens..

Computer the percent voids in total mix : An aggregate blend is composed of 53% coarse aggregate by weight (sp. gr. 2.702), 43% fine aggregate (sp. gr. 2.621), and 4% filler (sp. gr. 2.779)/ The compacted specimen contains 6% asphalt binder (sp. gr. 1.052) by weight of total mix, and has a b..

What are the normal stresses in the bars afterward : Two aluminium bars (E = 70 GPa) are attached to regid support at the left and a cross-bar at the end. An iron bar (E = 200 GPa) is at attached to the rigid support at the left and there is a gap b = 0.6 mm between the right end of the iron bar and cr..

If the bearing stress on the concrete pedestal must not : If the allowable stress in the cylinder is 55 MPa, what is the maximum internal diameter (nearest integer, such as 10, 11, 12, …., in units of millimetres) of the cylinder?

Describe how you analysed and defined a problem : Describe how you analysed and defined a problem and identified the engineering knowledge and skills required for solving the problem?

User Account

All Pages