If the blockage is further down the pipe, try a garden hose. Insert the hose as far as it will go and turn the water on to full pressure. The force can often dislodge soft clogs like dirt or sand. For stubborn blocks, a specialized pressure washer attachment known as a "drain jetter" is even more effective. 3. Using a Drain Rod
If you have tried the above and the drain remains blocked: unblock outdoor drain
Here is a step-by-step guide to clearing it safely. If the blockage is further down the pipe, try a garden hose
Keep the area around your drains clear of grass clippings and mulch. unblock outdoor drain