Water Supply Standards in Urban Areas in India
According to the standard set by the urban water commission, the supply of water per person in an urban area in India should be about 135 litres per day.
Explanation:
- The urban water commission in India sets standards and guidelines for the supply of water in urban areas.
- One of the key parameters they consider is the water supply per person per day.
- The standard set by the commission is 135 litres per day.
- This standard ensures that each individual in the urban area has access to an adequate supply of water for their daily needs.
- This includes drinking, cooking, bathing, washing, and other domestic purposes.
- The commission takes into account factors such as population density, water availability, and the overall demand for water in the urban area.
- By setting this standard, the commission aims to ensure equitable distribution of water resources and promote sustainable water management practices in urban areas.
- It is important for urban areas to adhere to these standards to meet the water needs of their residents and maintain a healthy and sustainable water supply system.
Therefore, the correct answer is D: 135 litres per day.

Water is a precious resource, and ensuring an adequate supply of water per person is crucial for the well-being of urban areas. In India, the urban water commission has set a standard for the supply of water per person in urban areas. According to this standard, the supply of water per person in an urban area in India should be about 135 litres per day.

The standard set by the urban water commission takes into consideration various factors such as the needs of different individuals, their daily water requirements, and the overall demand for water in urban areas. By setting a standard of 135 litres per day, the commission aims to ensure that each individual in an urban area has access to sufficient water for their daily needs.

Here is a breakdown of the factors considered by the urban water commission in determining the standard supply of water per person:

1. Basic Needs:
- Drinking water: The commission recognizes that each individual needs a certain amount of water for drinking purposes to maintain their health and well-being.
- Cooking: Water is essential for cooking food, and a certain amount is required per person for this purpose.
- Personal hygiene: Water is needed for activities such as bathing, washing hands, and maintaining personal hygiene.

2. Household Requirements:
- Cleaning: Water is required for cleaning purposes, such as washing dishes, clothes, and household surfaces.
- Sanitation: Adequate water is necessary for maintaining cleanliness in toilets and for flushing.

3. General Factors:
- Climate: The standard supply of water per person also takes into account the climatic conditions of the region. Areas with hot and dry climates may require more water for various purposes.
- Population density: The overall demand for water in urban areas depends on the population density. Higher population density generally requires a larger water supply.

Based on these factors, the urban water commission has determined that a supply of 135 litres per day per person is sufficient to meet the basic needs and household requirements of individuals in urban areas in India.

It is important to note that this standard is subject to periodic review and may be revised based on changes in water availability, population growth, and advancements in water management techniques. Additionally, individual states or cities may have their own specific standards based on local conditions and requirements.