California water agencies that spent more than $350 million in the last two years of drought to pay property owners to rip out water-slurping lawns are now trying to answer whether the nation’s biggest lawn removal experiment was all worth the cost. Around the state, water experts and water-district employees are employing satellite images, infrared aerial photos, neighborhood drive-bys and complex algorithms to gauge just how much grassy turf was removed. They also want to know whether the fortune in rebates helped turn California tastes lastingly away from emerald-green turf.