Two consecutive wet winters have filled a southern California reservoir for the first time since 1998, ensuring about two decades of water for tens of thousands of people and hundreds of farms north of Los Angeles. Lake Casitas, located in the Ojai Valley, reached its capacity last week, when water began trickling down its spillway, the Ventura County Star reported Saturday. The April 23 event marked only the eighth time the spillway has operated since 1978, according to the Star. The drought-plagued reservoir was less than 30% full two years ago and the Casitas Municipal Water District was co…