pooling and ponding
英文解释：Ponding means the excessive accumulation of water at low-lying areas that remains after 48 hours after the end of rainfall ; pooling is grouping together of various items or resources (sand, dirt and the list is much longer).
Ponding and pooling are no strangers to Ottawa streets during snowmelts. But during the spring, summer and fall, it’s just as normal to see them reappear on our streetscapes after major rain events and thunderstorms.
storm water or stormwater
英文解释：surface water in abnormal quantity resulting from heavy falls of rain or snow；storm water is water that comes from precipitation and ice/snow melt
Some areas of the city are more vulnerable to significant rain events due to geographical features in those areas. As a result, some catch basins in those areas are equipped with inlet control devices (ICDs), or commonly known as restrictors.
ICDs help manage stormwater when the storm sewer is beyond capacity. They help prevent stormwater pipes from surcharging and backing up into people’s basements. Water is contained on the surface where it will pond but gradually recede as the rainfall stops