STEP I	Choose road-type, vacant lots, and flooding to be my major data bases.
STEP II	Use map calculation to image the situation when vacant lots and flooding overlap together and get some spots which are heavy flooded lots.
STEP III	Locate water watchtowers on those spots and draw paths among golf courses along main raods. Locate hint corners to give people some hints which indicate where they should look toward and follow it to go to towers.
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