Here sump tank construction details including A sump collects water that is building up underground so that it can be pumped away from a construction site or finished building. The source of water for a sump is normally groundwater, but waste water generated from appliances can also be routed to a sump. A sump can also be an infiltration basin used to manage surface runoff water and recharge underground aquifers. dump to be decide on site 230mm brick wall ,50mm thk lean concrete grade 15, concrete slab drain cover to details A sump pit holds water that's leaked into the basement due to rain or ground water that's risen into the basement so the sump pump can remove it. Over time, a sump pit will accumulate dirt and other debris. It's a good idea to periodically clean your sump pit. for more details download this file