I wish to model my yard. For the most part it is a very basic rectangular lot, but along the back of the lot (50’) there is a very basic sloped hill. It rises 31" from the level part of my property, out 221" from the rear lot line.

What is the best approach to model this terrain, considering I wish to add a retaining wall into the hill, and model the structures that sit in my lot (on the level portion). How about simply stretching a triangle along the back of my property 31" high, with a 221" base running the 50’ length? This would provide unrealistically sharp edges.