Crusher
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Open sewers are cheaper to construct and easier to maintain, may be that is why they are made in such a way.
Most of the indigenous people in Pakistan used to live in villages just 50 years ago, in villages the sewerage system is interesting one, so every village has one of more "ponds" (called Chappar in punjabi language) near the houses, all the sewer lines used to empty in those chappar ponds. This is the only method people knew for centuries so when they shifted to urban areas they didn't know what to do so many of them still relied on that age old system but just channeled sewer lines to nearby wasteland, water stream or river etc.
It was government's duty to implement modern sewerage system in Pakistan at least in urban areas, but government in the past was always selective as only the planned localities were connected to government sewerage system whereas the mushroom "kach abadis" on the outskirts of the city just utilized their age old chappar sewerage system.
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