A sediment pond has been designed to take flood water from a small river that is high in suspended solids, allow the solids to deposit as sediment, and then return the water to the river when the flood risk has reduced. The pond can hold 1000 m³ of sediment as water-rich sludge. The sludge has a concentration of 100 g SS/L. The pond takes inflow with 50 g SS/m³ and returns the same volume later at 10 g SS/m³. When there is a storm, the flow rate in is 1 m³/sec and lasts for one day. How many of these storm events until the pond fills with sludge?

A sediment pond has been designed to take flood water from a small river that is high in suspended solids, allow the solids to deposit as sediment, and then return the water to the river when the flood risk has reduced. The pond can hold 1000 m³ of sediment as water-rich sludge. The sludge has a concentration of 100 g SS/L. The pond takes inflow with 50 g SS/m³ and returns the same volume later at 10 g SS/m³. When there is a storm, the flow rate in is 1 m³/sec and lasts for one day. How many of these storm events until the pond fills with sludge?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.6P

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

A sediment pond has been designed to take flood water from a
small river that is high in suspended solids, allow the solids to
deposit as sediment, and then return the water to the river
when the flood risk has reduced. The pond can hold 1000 m³ of
sediment as water-rich sludge. The sludge has a concentration
of 100 g SS/L. The pond takes inflow with 50 g SS/m³ and
returns the same volume later at 10 g SS/m³. When there is a
storm, the flow rate in is 1 m³/sec and lasts for one day. How
many of these storm events until the pond fills with sludge?

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