Fences and/or walls within the conservation zone shall conform to the following requirements:
      1.   Section 12.0 except that in front yards class 2 or 3 fences may be erected up to maximum height of sixty (60) inches.
      2.   Side and rear yard, class 1, 2, 3, 4, 5, 6, or 7 fences and/or walls may be erected up to a maximum height of ninety six (96) inches.
      3.   Class 8 walls shall be permitted but shall conform to requirements of the Corps of Engineers and/or City engineer, whichever is applicable.