What's impervious cover?

Impervious cover is any type of human-made surface that doesn’t absorb (is impervious to) rainfall. The category includes things like rooftops, patios, driveways, sidewalks, roads, and parking lots. 

Some uses - like uncovered wooden decks and unpaved portions of driveways - count as 50% impervious cover, because they allow some rainfall to be absorbed.

Want to learn more? 

Visit this page of City code to explore the issue and learn how calculations are made. 

Fast facts on the new code and

Environment & Flooding

An updated code will allow for appropriate density - building up, not out - and establish strict guidelines for new construction, preventing flooding and keeping our city green. 

FACT: The new code requires developers to do a much better job of handling run-off from big storms than is required under our current, outdated laws.