Definition of dry weather flow (DWF) and storm water flow. The book details (Biochemical Oxygen Demand – 5 days at 20°C) and COD (Chemical Oxygen Demand), explaining the ratio (BOD/COD > 0.5 indicates biodegradability).
India’s water supply and sanitation crisis in the 1960s and 70s was staggering. Most cities had intermittent supply, open drains, and manual scavenging. Rangwala’s book arrived as a . It gave the average junior engineer in a district municipality the ability to: water supply and sanitary engineering rangwala