RCC(Reinforced cement concrete) structure have a higher cost, and basements are constructed in RCC structures. Financially it is out of budget for most of us to afford basements. However it has many benefits e.g. extra living space, controlled temperatures in summers and winters both, safe from outside pollutions such as noise and dust etc. Basements can be designed for complete and partial accommodations. A complete accommodation includes master bedrooms with washrooms along with other divisions such as living area, store, servant room etc., whereas partial accommodation only includes later divisions. Partial accommodations are recommended more since it does not have wet areas such as washrooms & kitchens hence not requiring installation and maintenance of septic/liquid waste disposal systems. However if washrooms and kitchens are required in basements then there is a need of complete sewerage disposal system that should be made keeping certain technicalities in mind to avoid inconvenience in future in form of unpleasant smell, blockage, leakage or over flowing.
Like normal septic tanks, basement septic tank are also constructed in complete RCC structures. As we have already explained in one of our articles and a video about the basement’s RCC bed construction, it should be made sure that septic tank’s concrete is poured along with the RCC bed to avoid any joint in concrete. If by any means both can not be poured together, then water stopper should be used at joint of concretes poured separately. Another main technical point that should be kept in mind is the placement of uPVC drain/sewer pipes as shown in picture above. These pipes can either be placed right after the excavation and before bed PCC or after reinforcement(steel bars fixing) and before pouring concrete(as shown in picture above). uPVC should be used of best available quality/grade as recommended by the respective brand/company.
Once structure of septic tank is complete, next step is to place outlet pipes. Pipes shown in picture above are the inlet pipes that will carry waste water from washrooms/kitchens or other areas to septic system. Septic tanks of standard houses without basements are connected directly to public/society manholes where water automatically flows because of minor level difference (septic tank of house slightly higher in level as compare to society manhole). However in basement’s case, septic tank is at a too lower level from society manhole, hence electric pumping is required to carry waste water from basement’s septic tank to society’s manhole. For this purpose outlet pipe is placed that should be a minimum 2″ in diameter in uPVC. Electric point is also required and it should be placed nearest to septic tank for providing electricity to electric pump.
Electric pumps are available in manual and automatic both operations however automatic pumps are more recommended. Pumps should be of best available quality to avoid regular malfunctions that mostly occur in case of low cost and cheap pumps.