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I have a downspout that runs directly into the ground. downspoutsmall

My first question is where would a downspout that enters the ground like this lead to/empty out to?

My next problem is that this spout is partially clogged up in the pipe that's under ground level. When there is a heavy downpour, water will shoot out at the connection between the metal downspout and the black, plastic pipe. I've confirmed the clog is in the pipe as I've taken apart the connection and tested both the pipe and the metal downspout with a hose. Water runs through the downspout just fine. But when I put the hose directly into the pipe, water starts to backup. With that said, my second question is does anyone have recommendations for how I could clear the clog in this pipe that's underground?

Lastly, during the last downpour I noticed water bubbling up from the ground from a green, circular plastic cap that's in the yard on a straight line out from downspout. Looking at it further, the cap reads "NDS" and can be pulled up slightly, where I can look inside and see a large amount of "gunk." This seems to be related to the downspout and/or clog but I'm not certain.

Thanks for the help! yardnds

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    The nds thing is s pop up emitter it is attached to the downspout via an underground pipe. thedrainagesource.com/4_NDS_Pop_Up_Emitter_Adapter_Green_p/… – Kris Sep 12 at 21:16
  • 1. a cistern or front street gutter; a smoke bomb will tell for sure. – dandavis Sep 12 at 21:17
  • The turf in your yard may be to high to allow the emitter to function like it is supposed to – Kris Sep 12 at 21:30
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    @Kris Type this up as an answer. You nailed it. – JACK Sep 12 at 21:39
  • @Kris I do leave my turf on the high side so that definitely could be it. – John_Henry Sep 12 at 22:42
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The new house I bought has some of these, so I've done some checking on how they work and how to keep them in repair. The most important things are to keep the vertical part that attaches to the downspout sealed, and clean out the emitter side as necessary or keep the gutter and downspout from getting leaves and seeds that will clog the downspout or tubes.

Mine are made from 4" PVC pipe rather than corrugated drainpipe like yours, so the smooth inside helps push clogs to the emitter end because of the water flow. For water to flow, you need the downspout end higher than the emitter end (which looks like it's the case here). Because of the flow and force, most of the clogs in mine end up right under the emitter, so I can remove the cap and pull a handful of leaves out and replace the cap.

enter image description here Pardon the rough drawing, but this shows how the (potential) water level (orange line) forces water to the other end; the water level wants to even out on both ends so even if your emitter is low in the yard, water should still flow as well as it can. You may have a clog in the line if it hasn't been maintained for a while, but drainage has probably pushed all the clogging leaves to your emitter end so you can clean that out easily. I rarely have to take mine apart (but I keep the PVC unglued so I can check elbows if I need to).

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