Introduction An outside kitchen drain—often a floor drain, sink drain in an outdoor kitchen, or a gully trap connected to the main house drainage—is essential for removing wastewater, rainwater, and cleaning runoff. When blocked, it can cause standing water, foul odors, pest infestations, and even structural damage. Unlike indoor drains, outdoor drains contend with debris, weather, and root intrusion, making blockages more complex. Common Causes of Blockage Understanding the cause is the first step to effective clearance.