Andhra Pradesh Chief Minister N Chandrababu Naidu Monday ruled out supplying water by gravity this year from the partially complete Polavaram project. Also, he has revised the project completion deadline to June 2020 against December 2019 as was promised earlier. "Unless there is a massive flood (in river Godavari) of 15-16 lakh cusecs, we cannot supply water by gravity. However, we will be able to store some 23 tmc ft of water at the project and utilise it downstream," the Chief Minister told reporters at the project site.