Design leach pits for an offset pit pour $-$ flush latrine for two families $($each family has $7$members$)$ for a design period of$3$ years. The X$-$section of the pits has to be circle. The average waste water flow rate is $20$ liters per person per day. The soil is sandy loam with long$-$term infiltration rate of $22$ liters$/2/$day$.$ GWT is $3$m below the surface. In sketch, show the designed latrine and pit arrangement.