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CITY of ORONO <br /> Post Office Box 66•Crystal Bay,Minnesota 55323•Municipal Offices <br /> • <br /> e e •. On the North Shore of Lake Minnetonka <br /> INSTRUCTIONS FOR COMPLETING HARDCOVER CALCULATION WORKSHEET <br /> 1. Circle which setback zone (0-751, 75-2501, etc.) the calculation is <br /> for. <br /> 2. For each item of hardcover within that zone, enter the length and <br /> width, and multiply to get square footage (s.f.). <br /> 3. Add up all the square footages to get total square footage of <br /> hardcover. <br /> 4. Divide by the total area of property within the zone and multiply by <br /> 100 to get percentage of hardcover in the zone. <br /> 5. If changes in hardcover are proposed, you should do a "before" <br /> worksheet and and "after" worksheet. If either results in percentages <br /> greater than those allowed, contact City staff before proceeding with <br /> your project planning! <br /> HARDCOVER ORDINANCE - In 1975, the Orono City Council adopted an <br /> ordinance limiting the percentage of lot area that can be covered with <br /> impervious surfaces ("hardcover") such as roofs, driveways, sidewalks, <br /> etc. on properties located within 1,000 feet of a lake. Studies have <br /> shown that sediments, oils, and debris carried into the lake from <br /> highly urbanized areas have a detrimental impact on the quality of <br /> water in the lake. The intent of Orono's ordinance is to ensure that <br /> rainfall run-off will be cleansed by filtering through grassed or <br /> vegetated yard areas before entering the lake. <br /> Hardcover Zones - Allowed Percentages: <br /> 0-75' 0% <br /> 75-250 ' 25% <br /> 250-500' 30% <br /> 500-1000 ' 35% <br /> Hardcover includes: <br /> - Roofs <br /> - Sidewalks <br /> - Paved or gravel driveways <br /> - Patios & decks (includes slatted decks) <br /> - Tops of retaining walls & rock walls <br /> - Decorative landscape areas underlain by plastic sheeting or fabric <br /> - Any other surface that does not allow direct absorption of rainfall <br /> into the ground <br /> BUILDING&ZONING—473-7357 • ADMINISTRATION&FINANCE—473-7358 • PUBLIC WORKS—473-7359 <br /> ASSESSING <br /> 17 <br />