Plant advice for sloping yard

Hi Everyone, I'm looking for suggestions on plantings for a new old garden bed. Here's the issue: we live in NW Illinois, zone 5, heavy clay, full sun, cold winters. Our backyard was basically a sloping meadow that now has grass and a planting bed I dug in two years ago. The water seems to run off the top of the meadow straight into the bed washing away the soil and mulch I've put around bushes & perennials. So far I've lost three weigelas, an elderberry and various grasses and coneflowers. Any suggestions on plants and/or ways to absorb the water (it gushes because the soil is such heavy clay it justs runs across the top). Oh, and if the water or weather doesn't kill the plant the deer &rabbits might munch it so keep that in mind.
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