What are the disadvantages of Rainwater Harvesting ?

Rainwater harvesting can be a great way of avoiding rising water costs and utilizing the resources we have all around us. However, there are some disadvantages associated with it.

Disadvantages of Rainwater Harvesting

1. Unpredictable Rainfall: All places do not receive the same amount of rainfall. It is also difficult to predict rainfall. Therefore it is not advisable to depend on rainwater alone for all your water needs in areas where there is limited rainfall. Depending on rainwater harvesting alone, is suitable in those areas that receive plenty of rainfall.
2. Initial High Cost: It is not possible to predict the cost recovery period of a rainwater harvesting system. Also the initial installation cost for the same may increase depending on the system’s size and technology level.
3. Regular Maintenance: Rainwater harvesting systems are prone to rodents, mosquitoes, algae growth, insects and lizards which contaminate the harvested rainwater. They can become as breeding grounds for many animals if they are not properly maintained.
4. Certain Roof Types may Seep Chemicals or Animal Droppings: Certain types of roofs may seep chemicals, insects, dirt or animals droppings that can harm plants if it is used for watering the plants.
5. Storage Limits: One of the biggest disadvantage of rainwater harvesting is the storage facility. It is restricted not only by the size but also by time.