Line 168:
Line 168:
|-
|-
|Surface covered with turf grass and stone||Surface covered with mulch and dense, deeply rooting vegetation
|Surface covered with turf grass and stone||Surface covered with mulch and dense, deeply rooting vegetation
+
|-
+
|Internal water storage reservoir not included in underdrain design||Internal water storage reservoir included in underdrain design
|}
|}
===Design Variations===
===Design Variations===