(plaintiffs own wells used to pump ground water for irrigating crops via pipeline across defendants’ property; defendants objected to pipeline and sued for removal after digging it up and disabling it; plaintiffs received preliminary injunction allowing repair and use of pipeline to prevent crop failure; plaintiffs then sought easement across plaintiffs’ property via eminent domain; trial court granted summary judgment for irrigators to use pipeline in conjunction with canal owned by irrigation district; on appeal, judgment affirmed except that trial court, on remand, to consider plaintiffs’ trespass claim).