Permeable All the Way Through: Permeability Below the Pavement

A truly permeable ground section. The surface layer consists of graded crushed stone, permeable concrete, or grass pavers, beneath which is a forty-centimeter thick graded crushed stone retention layer, and further down is the original soil, without any impermeable垫层 or base plate. After rain, no standing water is visible on the pavement, nor are there any drainage ditches or catch basins. The edges of the pathway have no raised curbs, allowing water to spread naturally into the adjacent grassy areas. Avoid: placing a concrete垫层 beneath permeable pavement, adding side ditches and catch basins to collect water, using raised granite curbs to block runoff, limiting permeable pavement only to parking spaces or other localized areas.

Translated from Chinese by AI.

一段真正會滲水的地面。表層是級配碎石、透水混凝土或草溝磚,下面是厚達四十公分的級配碎石貯留層,再往下直接是原土,沒有任何不透水的墊層與底板;雨落下之後在鋪面上看不到積水也看不到排水溝與集水井。步道的邊緣沒有立起的緣石,水可以往兩側的草地漫流。避免:在透水鋪面下方做混凝土墊層、加設側溝與集水井把水收走、使用立起的花崗石緣石阻斷漫流、把透水鋪面只做在停車格等局部。