Ok guys, need alittle help. We are getting prices for a new inground pool. The first problem I noticed while in the back yard was that there is a nice slope coming across the yard and I think I might have to have a small retaining wall at one end of the pool. I will take some pics and take some measurements and check elevation. Could yall tell me what program yall use to "draw" on a pic so that I can diagram where everything is going??? Thanks alot.