Classification of katrines - strictly from the park textbook spm

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I now have the complete classification. Here is the full Classification of Latrines strictly from Park's Textbook of Preventive and Social Medicine:

Classification of Latrines

(Park's Textbook of Preventive and Social Medicine, p. 859)

I. Unsewered Areas

1. Service Type Latrines (Conservancy System)

Nightsoil is collected from pail or bucket type latrines by human agency, and later disposed of by burying or composting.

2. Non-service Type (Sanitary Latrines)

(a) Bore hole latrine
(b) Dug well or pit latrine
(c) Water-seal type of latrines:
- (i) P.R.A.I. type
- (ii) R.C.A. type
- (iii) Sulabh Shauchalaya
(d) Septic tank
(e) Aqua privy

3. Latrines Suitable for Camps and Temporary Use

(a) Shallow trench latrine
(b) Deep trench latrine
(c) Pit latrine
(d) Bore hole latrine

II. Sewered Areas

1. Water-carriage system and sewage treatment

(a) Primary treatment
- Screening
- Removal of grit
- Plain sedimentation
(b) Secondary treatment
- Trickling filters
- Activated sludge process
(c) Other methods
- (i) Sea outfall
- (ii) River outfall
- (iii) Sewage farming
- (iv) Oxidation ponds

Key note on sanitary latrines: A sanitary latrine must meet four criteria - excreta must not contaminate ground or surface water, not pollute the soil, not be accessible to flies/rodents/animals, and not create nuisance due to odour or appearance.

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