The urban water cycle is a relatively new concept (Cabrera and Custodio, 2013). Even if all early civilizations had large waterworks in order to secure good access to water for their citizens, the generalized establishment of urban supply did not start worldwide until the middle of the 19th century. Thus, available data and studies are based on recent history. In particular, the introduction of water chlorination by English physician John Snow to control water-borne diseases was a real turning pOint. Although it was not until the early

Table 8.1 Dolo on some of the largest cities in LA

Source: own elaboration.