Question

compare the drainage system at present with that of Indus valley civilization

Answer 1

Yes we can say that the drainage system and the roads were better during the times of Indus Valley Civilisation as compared to the contemporary India. Though by the use of technology we have very good roads today, but this is limited only to the expressways or the highways or few cities of India. Barring them we have a pathetic condition of roads in our country.
Let us look at some of the facts to support the argument :

The ancient Indus Valley Civilisation was prominent in hydraulic engineering and had many water supply and sanitation devices that were first of its kind.

Among the other things, they contain the world's earliest known flush toilets. These existed in many homes and were connected to a common sewerage pipe.

City walls functioned as barrier against floods.