There are several ways to fix drainage issues in your backyard. Here are some general steps you can follow:

1. Identify the problem: The first step is to identify the exact location and cause of the drainage issue. Look for areas where water is collecting or not draining properly.
2. Check for blockages: Check for any blockages in the drainage system, such as clogged gutters, downspouts, or drainage pipes. Clear any debris or blockages you find.
3. Grade the yard: Ensure that your yard is properly graded so that water can flow away from the house. If necessary, you may need to re-grade the yard or add soil to create a slope away from the house.
4. Create a drainage system: You can also create a drainage system to redirect water away from problem areas. This can include French drains, swales, or catch basins.
5. Install a dry well: If water is collecting in a particular area, you can install a dry well to collect and disperse the water.
6. Add plants: Planting trees, shrubs, and other vegetation can also help absorb excess water in your yard.
7. Consult with a professional: If you are unsure of how to address your drainage issue or if it is a more complicated problem, it may be best to consult with a professional landscaper or drainage contractor.

By following these steps, you can effectively fix drainage issues in your backyard and prevent future water damage.