You can put in an underground French Drain using gravel and a perforated and corregated pipe similar to that used for septic systems. Another option is to put a piece of 4" PVC under the existing sidewalk to allow the water to drain under it. Speak to a plumbing department person at your local Home Depot about these products and how to unstall them. Also ask about any drainage boxes with slitted tops to keep out debris.
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