 During this period, some of the municipalities that have had the most floods have been Ecatepec (8.68%), Iztapalapa (7.93%) and Chalco (6.44%), although Tultitlan and Chimalhuacan have been the most affected in terms of Urban growth reduces the permeability of the soil in groundwater recharge areas and increases the risk of flooding.people (36.09% and 32.7%, respectively).In low-lying neighborhoods such as Iztapalapa, residents are so accustomed to seeing a fetid sea of sewage rise in the streets that they have built miniature dikes in front of their homes.