So we are often working in fairly tight sub-division like neighborhoods, where houses are packed in tight very close to one another. Also, in the areas we work in there is often quite a large elevation change even from your front yard to your back yard. But even more elevation change from your property to your neighbors property, in a lot of cases. Sometimes the neighbor's house just 50' behind you can be 10-20' lower in elevation. So a common challenge for us in this situation is; Where do we outlet the drain pipe when we are installing an SRW for the upper property and the person in the lower property doesn't want anything to do with the job? That is, they don't want us to tie into their drainage system. So then the problem is how do I build the SRW when you can't outlet the drain pipe anywhere? I can't dump it onto the neighbor's property and they don't want me tying into their drain system. So how would you build this, then? Normally, I like to include a 3" or 4" drain pipe at the bottom of the gravel drain behind the wall. But in this case, I don't see a purpose for installing the pipe if there's nowhere to outlet it to. Let's keep it simple. Say we're talking about a basic 4' tall SRW with not much of a slope or surcharge above it. (See attached image). Would you just install a nice big gravel drain behind the wall and fore-go the ADS drain pipe? Is a gravel drain behind an SRW by itself enough to keep hydrostatic pressure from building up behind the wall? Keep in mind we have a LOT of rain here in the NW. So hydrostatic pressure is always a big concern when building these.