Flood risk from storm water is particularly high in areas where storm-water infrastructure has not been adapted to elevated runoff in creeks coming from mountains, as in Santiago (Ebert, A. and J. McPhee [2009]). Urban expansion in the eastern part of Santiago towards the Andean piedmont has also increased the amount of impervious surfaces, contributing to increased risks from flood hazards (Romero, 2012). To reduce the risk of flooding and to increase absorption of storm water, between 2006-2010, the city of Chicago replaced the pavement in more than 100 alleys in the city with more permeable surfaces and plantings (OECD, 2012c, City of Chicago, 2010). Since 1997, storm-water infrastructure has been the responsibility of MOP and the Ministry of Housing and Urbanism (Ministerio de Vivienda y Desarrollo Urbano/MINVU).