Blue regions (less than 0.5% slope) are so flat that extra steps might need to be taken to prevent ponding of water after storm events.
Green regions are ideal, with a slight slope that will allow for water runoff with minimal erosion.
Yellow and red regions have up to 5% slope, which might require some remediation for building to exist.
Black regions have over 5% slope. These areas would be less ideal for development because of the costs associated with managing erosion and providing road access.
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