Learn how to design a soak pit and a septic tank for 10 residential buildings with 6 persons per family. Follow the step-by-step procedure with formulas, diagrams, and video. A soak pit, also known as a soakaway or leach pit, is a covered, porous-walled chamber that allows water to slowly soak into the ground. Pre-settled effluent from a collection and storage/treatment or (semi-) centralized treatment technology is discharged to the underground chamber from which it infiltrates into the surrounding soil. A soak pit is a technique for discharging wastewater underground after partial treatment in a septic tank or a latrine. Learn about the needs, design, functions, types, and advantages and disadvantages of soak pits. Soak pit design and why you need it.. (Full Details HERE) | HPD Consult. Majorly for disposal of water generated from kitchen and bathrooms