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HARDCOVER ORDINANCE n 1975, the Orono City Council ad :ed an ordinance limiting the <br />percentage of lot area that can be covered with impervious surface ("hardcover") such as roofs, <br />driveways, sidewalks, etc. on properties located within 1,000 feet of a lake. Studies have shown that <br />sediments, oils, and debris carried into the lake from highly urbanized areas have a detrimental <br />impact on the quality of water in the lake. The intent of Orono's ordinance is to ensure that rainfall <br />run-off will be cleansed by filtering through grassed or vegetated yard areas before entering the lake. <br />Hardcover Zones -Hardcover includes: <br />Allowed <br />Percentages: <br />0-75 0% ✓ Roofs, <br />75-250' 25% ✓ Sidewalks, <br />2~~30% ✓ Paved or gravel driveway_s, <br />~s>~ ✓ Patios & decks (includes slatted decks), <br />✓ Tops of retaining walls & rock walls, <br />✓ Decorative landscape areas underlain by plastic sheeting or <br />fabric, or <br />✓ Any other surface that does not allow direct absorption of rainfall <br />into the ground. ..... <br />INSTRUCTIONS FOR COMPLETING HARDCOVER CALCULATION WORKSHEET <br />1. Circle which setback zone (0-75', 75-250', etc.) the calculation is for. <br />2. For each item of hardcover within that zone, enter the length and width, and multiply to get <br />square footage (s.f.). · <br />3. Add up all the square footages to get total square footage of hardcover. <br />4. Divide by the total area of property within the zone and multiply by 100 to get percentage of <br />hardcover in the zone. <br />5. If changes in hardcover are proposed, you should do a "before" worksheet and "after <br />worksheet. If either results in percentages greater than those allowed, contact City staff before <br />proceeding with your project planning! <br />;,;, <br />ef~~\~~~ <br />~~~m