Inserted on the bottom of the assembled Flo-Well® Dry Well Side Panels, the bottom panel prevents soil erosion under the dry well and provides a solid, stable base when adding a pump into the tank to send collected water to another location. No gravel is needed beneath the Flo-Well Dry Well Tank when using the bottom panel. Works in all soil conditions. The Flo-Well Dry Well System is used to detain and slowly release collected stormwater runoff. With the Bottom Panel, it can also work as a reservoir. Flo-Well Dry Wells can be stacked for additional capacity. Secure a bottom panel on the lowest Flo-Well tank to prevent erosion of the soil beneath the entire system.