If you are a programmer setup your folder structure like this
├───game
│   ├───mapbase_episodic
│   ├───mapbase_hl2
│   ├───mapbase_shared
│   └───joesewage
└───src

The svn folder must be called game because the vpcs are set up to compile into there.

To launch the mod go to Source SDK Base 2013 Singleplayer in Steam and set the launch options

-game "C:\path\to\joesewage"