Afilterunithassurfaceareaof6mwideand10mlong.Afterfiltering12900m3for 40 hr, the filter is backwashed at a rate of 0.5 m/min for 15 min.Find; a)the average filtrationrate. (b)the quantity of washwater (c)percentage of wash water to treatedwater

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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.