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. 

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requires developers to do a much better job of handling run-off from big storms than is required under our current, outdated laws.