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Raised beds are a popular way to grow vegetables, and there are all kinds of styles. This raised bed is really done nicely. It can be covered as seasons change by spreading bird netting or greenhouse plastic over the pvc arches, plus tall plants can be grown on the trelises. Click on the link and take the time to read the comments. (No plans given, but the picture seems easy to figure out.)
Raised beds, collecting rainwater as well. - perhaps tiered beds can have a French drain at the end that catches excess water run off from the rain. It would be a larger area to collect rain water and would only be extra If the other plants were all watered.