When the Old Well on CalGiant’s Rosemary Ranch in Santa Maria went down, it was time to rehabilitate. The 16” diameter, 430’ deep well had gone online in 2013, producing 500 gpm. It was now producing less than 100 gpm of output, with a static water level of 181’, and a specific capacity of just 0.42. Worse yet, it was breaking suction. Key before and after performance metrics consisted of:
• Output Before Rehab: breaking suction @ 100 gpm, Output After Rehab: 500 gpm -> (Increase: 500%)
• Drawdown Before Rehab: 240’, Drawdown After Rehab: 114’
-> (Improvement: 47.5%)
• Specific Capacity Before Rehab: breaking suction @ 0.42, Specific Capacity After Rehab: 4.4 -> (Increase: 1,044%)
The Rosemary Old Well is now performing as it did when first online.