From section 1 at p₁-750 kPa, water flows through a galvanized iron pipe of 50 mm inside diameter and 40 m length to section 2, which is 40 m lower than section 1. a. If the flow rate was Q-0.015 m³/s and the pipe surface roughness € = 0.15 mm, calculate the pressure at section 2. b. After years, the pipe corrodes, and the inner surface becomes rough. An engineer measured the flow rate and found Q=0.015 m³/s and p₁= 750 kPa as before, but the pressure at Section 2 becomes p₂-250 kPa. Estimate the roughness height.

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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.