How can I tell whether a French drain is likely to address a water problem?
Observe where water collects, when it appears, and whether it follows rainfall, a leaking downpipe or a persistently wet area. Surface runoff, a blocked drain and groundwater can look similar but require different investigation. Check where existing drains discharge and avoid directing water toward neighbouring property or foundations. The site levels and soil conditions need to be considered before selecting a drainage layout; garden drainage may also be relevant.
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