Harappan Drainage System and Town Planning
The drainage system in the Harappan cities is a clear indicator of town planning due to the following reasons:

Sophisticated Engineering
- The drainage system in Harappan cities was advanced for its time, consisting of covered drains, manholes, and soak pits.
- The fact that the drains were covered indicates a conscious effort towards maintaining cleanliness and hygiene in the cities.

Prevention of Waterlogging
- The well-planned and interconnected drainage system helped prevent waterlogging, which could have led to the spread of diseases and deterioration of infrastructure.
- The layout of the drains suggests a systematic approach to managing wastewater and rainwater runoff.

Urban Planning
- The presence of well-laid-out streets, organized residential areas, and public structures in Harappan cities suggests a high level of urban planning.
- The inclusion of an efficient drainage system as part of this planning further highlights the importance given to sanitation and public health.

Hygienic Living Conditions
- The presence of a sophisticated drainage system indicates that the Harappan people valued cleanliness and hygiene in their living spaces.
- This focus on sanitation points towards a well-developed understanding of public health and urban living.
In conclusion, the drainage system in Harappan cities is a significant aspect of town planning, showcasing the advanced engineering skills and urban planning practices of the Harappan civilization. The presence of such a well-organized system indicates a conscious effort towards creating clean, healthy, and sustainable urban environments.