Pit latrine has a depth of ____ feet

Dug well latrine or pit latrine is an improvement over borehole latrine. A circular pit of 75 cm in diameter and 3-3.5 m (10-12 ft) deep is dug to the ground for the reception of the night soil. The pit may be lined by pottery rings. Merits are: easy to construct, has a longer life than borehole latrine. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 821