The paper has analyzed on the grain size,total organic carbon(TOC) content,Hg and CaCO_(3) content of 105 samples from Weihe river deposits in Xi an suburb,and hereby has studied the flood changes indicated by the deposit sequence over the past 120 years based on the chronology data recorded by historical books.

Recent flood changes of Weihe River in Xianyang;

Study on flood resources utilization by Zipingpu key water-control project;

Under the condition of arid and flood coexistence and the water resources shortage,the flood resources utilization has became more and more important.

This paper demonstrated theoretical base of flood resources utilization,and explained the conception of flood resources utilization in detail.

Based on the concept of "flood resource utilization" and influencing factors of adjusting the limited level of reservoirs during the flood season,an indices-evaluating system and estimating method about risk and performance related to the adjustment of limited level was set up,and the risk management countermeasure of the water level adjustment was discussed.

Channeling flood water from rivers to realize flood resource utilization, the water head of inside and outside of channel head is one of keys to flood quantity.

Someproblems about flood resource utilization are invest.

Evaluation of potential of floodwater utilization in the middle and lower reaches of the Weihe River;

With the rapid development of social economy and water requirements,water resource shortage problem is deteriorated and the function of reservoir in terms of floodwater utilization becomes more and more important nowadays in China.

In the increasingly serious contradiction between the water resource supply and demand in China, especially in North China, several key factors of floodwater utilization such as necessity and feasibility, theory and technology of reservoir optimization dispatching and risk rate calculation are analyzed.

It deems that it can solve not only the issues of depletion,water shortage and sedimentation of the middle and lower Yellow River,but also alleviate the water pollution and environment deterioration by the ways of "flood storage","sediment regulation","washout pollution","bed-building" and "flood diversion" through the study on flood resources implementation of the Yellow River.

Flood resources utilization is an important measure to exert flood resources characteristic,lessen water resources shortage,reduce waterlog and drought losses,and actualize continuable development of water resources.