How were Harappan cities maintained?

Harappan cities were meticulously planned and maintained with advanced urban infrastructure. The cities had a well-organized layout with straight streets, carefully arranged houses, and public buildings. Drainage systems were sophisticated, with covered drains running along the streets, ensuring cleanliness. The cities also had granaries for storing surplus food, and large structures, like the Great Bath at Mohenjo-daro, suggest an emphasis on public hygiene. This careful planning indicates that the Harappans had a well-developed system of administration to maintain the cities’ order and functioning.

This question related to Chapter 6 Social Science Class 6th NCERT.
From the Chapter 6. The Beginnings of Indian Civilisation.
Give answer according to your understanding.