high and dry place
塏 centers on a high and dry location, typically elevated ground that stays free of moisture.
塏 combines 土 (earth, ground) with 豈, which likely contributes the sound and may carry a sense of elevation or dryness. The exact historical development is uncertain.
The left side is earth 土, and the right side 豈 looks like a mound with a flat top. Picture a high, dry mound of earth rising above damp ground.
For カイ, imagine a kite flying high above a dry, elevated place: kite -> カイ, and the kite soars over the high ground.