Debris Flow Nets on San Ysidro Trail

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By Patti

I just hiked up to San Ysidro Falls this foggy Friday morning and saw the Impressive massive NET to hold back any debris flow from any rain. WOW it's impressive for sure! Maybe this can be shared with Edhat for people that can't hike up and see it!

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a-1571068948 Aug 26, 2019 04:30 PM
Debris Flow Nets on San Ysidro Trail

Please forgive me if this is a stupid question. And I do want a real answer, not a snarky one-liner, please. I have seen this debis flow net up close and my hiking friends and I were all wondering what the purpose of the bigger, loose hanging rings is(that's the best description I can come up with). Thank you.

sbmh2015 Aug 26, 2019 06:11 PM
Debris Flow Nets on San Ysidro Trail

Here is a link that might help explain https://partnershipsb.org/net-project. (Sorry couldn't hyperlink to work). The big rings help the nets work when impacted by debris

PitMix Aug 26, 2019 09:11 AM
Debris Flow Nets on San Ysidro Trail

The best outcome is if they never get tested. Hopefully the watersheds will continue to recover before we get another 100-yr short duration rain event like we had that fateful night, the 15 minutes that changed the world.

a-1571068948 Aug 24, 2019 06:48 PM
Debris Flow Nets on San Ysidro Trail

Couple tree trunks and some brush'll fill these nets to bursting in a flash(flood that is). Then you've got an eighteen foot high waterfall over the top of anbulging dam o' debris straining like Dolly Parton's bra. Meanwhile people still think living downstream is a reasonable idea.

tagdes Aug 24, 2019 11:29 AM
Debris Flow Nets on San Ysidro Trail

First of all the large rings are about 2' in diameter and smaller ones are over a foot, so Halibut 52 is correct no birds, even hawks and eagles could get caught up in them and plenty of room, about 2 or more feet underneath them for all the smaller animals, even Pumas to use their normal traverse up and down the creeks. To Thomas John and others, they are not there to stop the earth flow. They are there to stop the boulders and debris so the catch basins down stream can handle the rest. Most importantly they.....will not and are specifically designed not to divert the water into new channels.

Channelfog Aug 24, 2019 11:40 AM
Debris Flow Nets on San Ysidro Trail

Tadges, thank you for your concise description. I now have a much better understanding of the function of these structures.

Lucky 777 Aug 24, 2019 10:42 AM
Debris Flow Nets on San Ysidro Trail

Just asking: When a boulder the size of a Volkswagen bug comes tumbling down the creek will these stop it? What weight and force are they rated to withstand? I have to agree with THOMAS JOHN that it looks as if it does stop rocks they will build up against it and the water will divert around it. Someday we will find out.

a-1571068948 Aug 24, 2019 10:00 AM
Debris Flow Nets on San Ysidro Trail

THOMAS JOHN you are so RIGHT. These things are not going to stop the debris flow. At best they ‘fill up’ and back up to create a new creek bed which the water flow pushes the following debris right over. Need diversionary flow channels going to large holding ponds - several off of each flow paths. Just also sayin’.

Thomas John Aug 23, 2019 08:31 PM
Debris Flow Nets on San Ysidro Trail

Just saying... these nets look totally unable to deal with the volume of earth that came down in the debris flows.

a-1571068948 Aug 23, 2019 05:45 PM
Debris Flow Nets on San Ysidro Trail

Thank you to the Partnership for Resilient Communities for installing these nets. This project took a great deal of effort, commitment, and creativity. These nets will make Montecito safer and could well save lives and mitigate future property damage. Also thank you to Patti for posting these photos.

halibut52 Aug 23, 2019 05:04 PM
Debris Flow Nets on San Ysidro Trail

To 4:21pm: Because Patti wasn't able to include anything in the pics to show scale, it isn't possible to see how large the rings really are. Each of the 3 horizontal sections is nearly 6' tall. No local birds are going to get caught in them. Thanks for the pics Patti!

Flicka Aug 23, 2019 04:41 PM
Debris Flow Nets on San Ysidro Trail

Seems when they were putting these nets in they said there is room at the bottom for animals to go under. I can't imagine why birds would be around them. I've seen birds caught in nets over fruit trees meant to keep birds out with them caught in the net, I'd guess trying to get in at the fruit.

a-1571068948 Aug 23, 2019 04:21 PM
Debris Flow Nets on San Ysidro Trail

Any chance animals, birds in particular, might get stuck in the mesh? It seems that nets, even metal ones, often "incidentally" trap and kill hapless creatures.

oceandrew Aug 23, 2019 06:27 PM
Debris Flow Nets on San Ysidro Trail

You may be surprised to know that wild critters are not as "hapless" as many of us assume. You won't find any coyotes taking selfies at the edge of a mudflow or deer hanging ten on a log flowing downstream.

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