 In part, this was due to a cyclical change in rainfall, reducing the amount of water fed into the reservoir and increasing the impact of evaporation in the hot, dry climate.In part it was due to growth of the city and growing per-capita demand for water as the population became more affluent, using water for purposes such as filling swimming pools and washing cars.By the end of 2002 the reservoir was 79% full, and by the start of 2004 it was 54% full.