Drainage waterproofing can be a highly effective method for preventing water infiltration in your basement or crawlspace, especially in cases where poor drainage is contributing to the problem. Here are some steps to follow to install a drainage system:

Determine the type of drainage system: There are different types of drainage systems available, such as French drains like the trench and the pit, interior drain systems, and exterior drain systems. A professional can help determine which type of system is best for your specific situation.

Excavate the area: In order to install the drainage system, the area around the foundation will need to be excavated. This may involve removing landscaping, concrete, or other materials.

Install the drainage system: Once the area is excavated, the drainage system can be installed. This typically involves installing a perforated pipe surrounded by gravel (drainage stone) or other aggregate material, which is then covered with filter fabric to prevent clogging.

Connect the drainage system: The drainage system will need to be connected to a sump pump or other type of drainage outlet (example: french drain pit) to remove the water from the area.

Backfill the area: Once the drainage system is installed and connected, the area can be backfilled with drainage stone separated by filter cloth and a layer of soil on the very top and landscaping or other materials can be replaced. 

It's important to note that installing a drainage system can be a complex process and is best done by a professional. A qualified contractor can assess your specific situation and recommend the best course of action to prevent water infiltration and protect your home from damage.