A river, flowing at 1.5 m3/s, is polluted with the pesticide permethrin and flows into a lake (100 m x 100 m 2.5 m). The steady state concentration of permethrin leaving the lake is 1.4 ppm and the average cross-sectional area of the river is 2.7 m2. The half-life of permethrin in this environment is 19 hrs.What is the concentration of permethrin entering the lake? What distance downstream of the outlet would the concentration be less than 1 ppm?

Answered: A river, flowing at 1.5 m3/s, is…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A river, flowing at 1.5 m³/s, is polluted with the pesticide permethrin and flows into a lake (100 m x 100 m 2.5 m). The steady state concentration of permethrin leaving the lake is 1.4 ppm and the average cross-sectional area of the river is 2.7 m². The half-life of permethrin in this environment is 19 hrs.

What is the concentration of permethrin entering the lake?

What distance downstream of the outlet would the concentration be less than 1 ppm?

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