For the purpose of this chapter, “impervious surfaces” shall mean any asphalt concrete, cement concrete, compacted rock/gravel or other substance rolled, laid, poured, or otherwise installed to create a layer of material upon the ground which does not absorb water or through which water cannot drain into the underlying ground. [Ord. 4515 § 2, 2021; Ord. 3670 § 3, 2004; Ord. 3316 § 4, 1998; Ord. 2465 § 1, 1983; Code 1970 § 16.05.020.]