Right side
发 supplies the sound (fā → pō, a shift but the labial stays). Faintly semantic too:
发 means 'to send out, emit', and
泼 is water sent out forcefully. Same phonetic family includes
拨 (bō, push aside) and
钵 (bō, alms-bowl). Simplified
发 replaces the traditional
發 phonetic in
潑.