AHMEDABAD: How efficient is water supply in some of the cities in state? A recent Asian Development Bank (ADB) data book of water utilities for 2007- 08 in 20 cities in country says that Ahmedabad has one of lowest water revenue collection ratios and a poor coverage of water supply network. On the other hand, though Rajkot supplies water for the least amount of time in country, it boasts of second largest coverage in terms of piped water supply network in the country. The study covers 15 municipal corporations and two city boards and also examines cities across the country on various parameters like water supply coverage, per capita consumption, production per population, unaccounted water connections, average tariff, unit production cost, operating ratio, revenue collection efficiency, accounts received and water supply staff per 1,000 connections. According to ADB, Ahmedabad Municipal Corporation (AMC) provides a two-hour supply with each consumer getting 171 litres of water per day. The network covers just 74.5 per cent of connections, out of which only 3 per cent are metered. The difficulty for AMC in revenue collection can be seen from the fact that if there are 14.5 lakh registered commercial and residential units, only 6.62 lakh units have legal water connections. Besides, AMC charges just Rs 100 from every consumer for capital costs per connection, which is lowest in the country. This charge only makes for maintenance and operation costs of water supply department. AMC also has the second lowest revenue collection, with just 67 per cent. Of the total water supplied, 98 per cent of water goes for domestic purposes. The civic body has no mechanism to measure unaccounted water supply. ADB