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31 of 40 <br />Background <br />•Constructed in 1960s <br />–Funded by property owners through <br />General Improvement District <br />–Average lifespan of reinforced <br />concrete is 50-100 years <br />•Limited capacity <br />–Channels designed for lower flows <br />than we see today <br />–Increased runoff from development <br />–Larger, more frequent rain <br />events anticipated