My friend went down into his water well. It is about 25-feet deep, with 36-inch in diameter concrete curbs. After pumping the water out, he started pulling out the droped in objects. At the botom of the concrete curbs, upright boards were side by side going down into the sandy bottom. He now wants to get a laborer to dig down further to increase his water depth. The water is comming in above the bottom. Anybody know why the wood boards would be put at the bottom of the concrete curbs?