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PAWTUCKET DOWNTOWN DESIGN PLAN FINAL ... - VHB.com

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Eco-Stone.<br />

The most <strong>com</strong>mon materials for parking lots, concrete and asphalt can be<br />

done with new techniques and types so that they are porous. This does not<br />

affect heat island reduction, but it does help significantly with water run off.<br />

More information can be found at the websites of the National Ready Mixed<br />

Concrete Association and the National Asphalt Pavement Association.<br />

Effectiveness Good option for water-run off, permeability can decrease over<br />

time with sand infiltration; does not help heat reduction<br />

Applications High traffic areas<br />

Durability High<br />

Maintenance Same as a standard lot<br />

Aesthetics<br />

Masonry: high aesthetic value;<br />

Porous concrete or asphalt: looks like a regular parking lot<br />

ANNUAL RAINFALL<br />

55% EVAPO-TRANSPIRATION<br />

SOIL<br />

INFILTRATION<br />

17% RUNOFF<br />

UNDISTURBED CYCLE<br />

28% BASE FLOW<br />

ANNUAL RAINFALL<br />

5% EVAPORATIVE LOSS<br />

REDUCED<br />

INFILTRATION<br />

THROUGH<br />

COMPACTED<br />

SOILS<br />

DISTURBED CYCLE<br />

PDDP <strong>FINAL</strong> REPORT<br />

95% RUNOFF<br />

0% INFILTRATION<br />

83

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