An open rectangular tank 2m by 2m and 3.5m high contains 3 layers of liquids with specific gravities of 1.3, 1.0, and 0.9, and heights of 1.0m, 1.5m, and 0.5m respectively. An opening with an area of 25 cm2 and coefficient of discharge of 0.711 is situated at the bottom of the tank. 1. How long will it take to discharge the bottom layer of the liquids? in seconds 2. What is the total time to discharge the bottom and the middle layers of the liquids? in seconds 3. What would be the total time to discharge all the liquids? in seconds

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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.