usually these kinds of initiatives also involve planting local plants, and specifically not manicured lawns for this purpose. Lawn grass isn't even native to No

usually these kinds of initiatives also involve planting local plants, and specifically not manicured lawns for this purpose. Lawn grass isn't even native to North America, and a lot of the examples are North American. This is usually meant to retain enough water to prevent building lots of grey infrastructure. The Thames Tideway tunnel to lower the amount of sewage outflow in London is 4.3B pounds. In that context, building a lot of mini-retention ponds for tens of thousands of pounds is a lot cheaper. and this isn't the only strategy; a lot of modern parks, for example, are built with facilities like courts for sports below the ground level of the park, so that during flood times they turn into bathtub holding ponds as well. https://en.wikipedia.org/wiki/Thames_Tideway_Tunnel https://en.wikipedia.org/wiki/Thames_Tideway_Tunnel