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We are building very similar DWSS right now here in Nepal (Gorkha district). Trenching of HDPE pipes is highly recommended, but due to climate and habits no need to bury it 1m deep (which would be indeed an issue I guess).

The usual pipe trenches are maybe 30-40cm deep, which are later simply backfilled with the earth taken out. In most of the hilly region freezing of pipes (the main reason why you would want to dig deeper) is not really an issue, and higher up communities are very used to keep water flowing during cold spells to avoid pipes freezing shut and bursting.

We usually ask the community to contribute the digging and they seem to have no problem with that. In our internal calculations the community contributions for free labour are usually around 20-30%.

We are building very similar DWSS right now here in Nepal (Gorkha district). Trenching of HDPE pipes is highly recommended, but due to climate and habits no need to bury it 1m deep (which would be indeed an issue I guess). guess). Estimates for how long it takes to dig are hard to do, as community labour availability is highly seasonal. So sometimes it takes several weeks and sometimes it is done in a few days...

The usual pipe trenches are maybe 30-40cm deep, which are later simply backfilled with the earth taken out. In most of the hilly region freezing of pipes (the main reason why you would want to dig deeper) is not really an issue, and higher up communities are very used to keep water flowing during cold spells to avoid pipes freezing shut and bursting.

We usually ask the community to contribute the digging and they seem to have no problem with that. In our internal calculations the community contributions for free labour are usually around 20-30%.