This case stems from a drainage dispute between neighbors in California. The plaintiff claimed that the neighbor’s poor property drainage caused water intrusion that led to flooding in the plaintiff’s basement. In the year leading up to the complaint, there were record rainfalls in the parties’ county of residence. Because the events correlated with significant rain events in the area, the defendant neighbor argued that her house was not built to sustain that much rainfall and that the damage was not due to how her property drained off. A hydrology expert was sought to access and aggregate rainfall data to demonstrate how much rainfall there occurred in the area during the particular dates in question.