Does a Wild Surge effect replace the effect of the spell cast triggering it or both effect happens?

@Plaguescarred @JeremyECrawfordDoes a Wild Surge effect replace the effect of the spell cast triggering it or both effect happens? Tx both spells trigger. That's how we played at #GenCon

— OregonPinkRose (@OregonPinkRose) August 30, 2014

@Plaguescarred @OregonPinkRoseMe too but i don’t know if intended like previous ed that’s why i asked Jeremy to have the devs opinion…. A Wild Surge effect is meant to be in addition to a spell's effect.

— Jeremy Crawford (@JeremyECrawford) August 30, 2014