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Here are a few tips:
Excavate a few inches deeper than the finished elevation of the stone bed (ensures you don't hold water back on the neighbors upstream).
Excavate an additional trench at the bottom of the swail to hold a 6" corrugated perforated pipe (capped at both ends). This will hold small amounts of standing water, keeping it from seeing sunlight, which will prevent algae growth.
Line the bottom of the swail with weed fabric (even before you place the pipe), then place the pipe and cover it with another layer of fabric.
Use different sized stones, from 3/4" up to 12-16", placing the largest ones first, then just pouring/dumping the others around them and raking it out. Gives the most natural look, IMHO.
Hope that helps.
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