Based on the systemic planning of water resources of Heshan City

Guangdong Province

and a mass of data about hydrology and ecology collected from field survey

the classification of river eco-environmental water requirement was discussed.The objectives of the research were to realize basic ecological functions of a river and approximately calculate the eco-environmental water requirement of Shaping River using the updated calculation method for eco-environmental water requirement.Classification and computation are performed for making contributions to the harmony of society and economy

sustainable development and realization of optimal eco-environmental development.The results from calculation show that the total eco-environmental water requirement of Shaping River is about 3.18×107 m3

accounting for 38.6% of normal annual runoff.According to the eco-environmental water requirement

the distribution of water resources of the river is optimized

and the optimal projects of water saving and water resource protection are designed by the characteristics of water requirement of the river

The research offers a scientific basis for the rational exploitation

utilization and protection of water resources of the river.