As Kestral stu said, its about minimum climb gradients you MUST acheive in certain segments of the takeoff, particularly in the event of an engine failure. And the Chevin is right slap bang in the middle of one of those segments. Hence Rwy 32 becomes restrictive.
Aircraft Performance is a science and to explain it to a layperson, (forgive the term) would take more than a couple of paragraphs.