flood risk from storm water is particularly high in areas where stormwater infrastructure has not been adapted to elevated runoff in creeks coming from mountains as in santiago ebert a and j mcphee 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 to reduce the risk of flooding and to increase absorption of storm water between the city of chicago replaced the pavement in more than alleys in the city with more permeable surfaces and plantings oecd c city of chicago since stormwater infrastructure has been the responsibility of mop and the ministry of housing and urbanism ministerio de vivienda y desarrollo urbanominvu