Four rain-gauges are located in an area. The rain gauges are numbered 1,2,3 and 4 respectively. Rain guage 1 has a Thiessen polygon weight of 0.4 and rain recording of 25 cm. Rain guage 2 has a Thiessen polygon weight of 0.2 and rain recording of 15 cm. Rain guage 3 has a Thiessen polygon weight of 0.3 and rain recording of 20 cm. Rain guage 4 has a Thiessen polygon weight of 0.1 and rain recording of 22 cm. Calculate the average rainfall in the area.

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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.