Reservoir Blocks simplify building basins for disappearing pondless waterfalls and fountain basins. Using Reservoir Blocks allow you to make your catch basin smaller because when you fill the basin with rock you have to make the hole bigger because the rock displaces so much water. The use of Reservoir Blocks will save you both time & money. Using Reservoir Blocks will allow you to dig less, move less rock, use less liner, increase your water storage capacity by 50%, and complete your water feature smarter and faster. We offer both Economy and Professional Reservoir Blocks help you match the budget of your project. Reservoir Blocks are stackable to maximize the footprint of your basin.