Terms and thinking about the memo
Here is a first-draft structure for your memo:
Define rain garden briefly, focusing on form and function: (definition paragraph); No citation necessary, as this is common knowledge)
Categorize rain gardens as a kind of low impact development (categorizing paragraph); Citation useful here, use EPA or the Bioretention Manual)
Illustrating paragraph FOR MONDAY. Think of this as extended definition.....
Document the effectiveness of rain gardens (logos-proof paragraph with ethos of citation authority); Citation essential here, based on Allen Davis' work)
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A Gathering of Rain Gardens here.