Lake Westley is a 15,000 m³ lake, fed by Buttercup River and drained by a number of small tributary streams. Lake Westley also receives runoff from nearby agricultural fields. Buttercup River has flow rate of 3.5 m³/s and a P concentration of 1.7 mg/L. Direct run off from adjacent fields adds an additional 45 kg/d. If the settling rate constant in the lake is 1.1/day, determine the steady-state P concentration (in mg/L) in the tributary streams that drain the lake. You may assume steady-state water flow into and out of Lake Westley, and that evapotranspiration and runoff balance.
Lake Westley is a 15,000 m³ lake, fed by Buttercup River and drained by a number of small tributary streams. Lake Westley also receives runoff from nearby agricultural fields. Buttercup River has flow rate of 3.5 m³/s and a P concentration of 1.7 mg/L. Direct run off from adjacent fields adds an additional 45 kg/d. If the settling rate constant in the lake is 1.1/day, determine the steady-state P concentration (in mg/L) in the tributary streams that drain the lake. You may assume steady-state water flow into and out of Lake Westley, and that evapotranspiration and runoff balance.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Lake Westley is a 15,000 m³ lake, fed by Buttercup River and drained by a number of small tributary streams. Lake Westley also receives runoff from nearby agricultural fields. Buttercup River has flow rate of 3.5 m³/s and a P concentration of 1.7 mg/L. Direct run off from adjacent fields adds an additional 45 kg/d. If the settling rate constant in the lake is 1.1/day, determine the steady-state P concentration (in mg/L) in the tributary streams that drain the lake. You may assume steady-state water flow into and out of Lake Westley, and that evapotranspiration and runoff balance.
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