After removing a very old above ground pool we designed and installed this Tri Level garden with stone staircase and lower patio with gas fir pit, waterfall and 3 ponds. Landscape Lighting at night created a warm feeling in this Colorado backyard setting. Main Design Challenges: 1. Accommodating for large water run off under lower patio area with 24" of drainage stone. 2. Erosion control of a 22 vertical feet. Installing 84 Stone of large boulders that locking with drainage behind allowed water to move freely and holds back moving soils.