How Ancient Terraces Were Constructed
Natural stepped-limestone (1) forms the foundation of the terraces. On the front edge of the horizontal surface of the limestone terrace a stone retaining wall (2) was constructed behind which are alternating layers of gravel and soil fill (3). Gradually, on top of this porous bed, silt and organic matter (4) accumulated to make a thin layer of rich soil where plants can grow. This type of terrace construction minimized hillside erosion caused by heavy rains. Rainwater is absorbed by the porous soil-gravel bed; surplus water flows slowly over the bedrock to the terrace below.