A flexible erosion control barrier for an outdoor equipment support pad generally comprises a geosynthetic soil retention barrier with a reinforced attachment area along a side configured to facilitate its attachment about a perimeter of the support pad. The soil retention barrier has an opposing, unjoined portion that extends outward from the side walls of the support pad, such that the soil retention barrier can fold up or down outside the perimeter of the support pad. Flexibility of the geosynthetic material allows a full or partially surrounding skirt to be configured to overlay the ground to re-direct drainage or to form an erosion-resisting corner fold in the ground around the soil under a side corner of the support pad. A strip of material that is more durable than the soil retention barrier material may protect the attachment area from damage after installation.