The recently cleared Mass Rapid Transit System-Ring Rail merger for Delhi may come a cropper as both the Centre and the Delhi government are clueless over the daily requirement of over 12,000 tons of water to complete the project. The Delhi Metro Rail Corporation (DMRC), a joint undertaking of Delhi government and the centre, claims that water requirement will be met through groundwater extraction, but has failed to comprehend the already plunging water level in Delhi.