pour, splash, water, sprinkle, violent, malignant
潑 centers on liquid moving forcefully: pouring, splashing, or sprinkling water. The extended senses of violent or malignant describe the aggressive, uncontrolled nature of such splashing.
潑 combines 氵 (water) with 發, which likely contributes the sound and the idea of releasing or sending out, together suggesting water being thrown or splashed.
Water 氵 is being released 發, like a bucket of water thrown out: it pours, splashes, and sprinkles everywhere.
For ハツ, imagine a splash so violent it sounds like a hat being slapped onto water: hat -> ハツ, and the water splashes up.