this is a brutal question. i am struggling to understand the topography, but it appears they are on slope, it appears they are scraped bedrock surfaced, and may be some kind of engineering/drainage control between the house lot and what appears to be a knoll or low ridge to the west/northwest separating the pond from the house property. in summary, they may serve to direct the groundwater table and surface run-off in southwest direction away from the house lot.
