Rainwater Harvesting Systems collect and store precious rainwater, while adding the beauty of a water feature. The Aquascape Harvesting System adds the beauty of a water feature to a rainwater collection system for capturing, filtering. and reusing our most precious resource – water! Whether you choose a Pondless® Waterfall or bubbling urn for your landscape, you’ll be happy knowing your rainwater harvesting system not only looks great but is beneficial for the environment, too. The Aquascape Rainwater Harvesting Pondless Waterfall Add-On Kit makes it easy to add a stunning waterfall or stream to Aquascape Rainwater Harvesting Systems. The water will flow over the included EPDM liner and disappear gracefully into gravel. Water is then directed back into the sub-surface reservoir and recirculated. A successful rainwater harvesting project relies on properly pre-filtering the rainwater before it enters the storage reservoir. Harvesting.