Proposed in this paper is a method of model selection based on kernel alignment for support vector machines-OMSA (optimal model selection algorithm) by means of learning on kernel matrix.

0 based on support vector regression is put forward, the method can select kernel function using kernel alignment, can select keen correlative features repeatedly and update model dynamically.

Aimed at the status that there is no uniform standard for calibration of water distribution network model,the calibration standards for hydraulic model of water distribution network at home and abroad are reviewed,and the calibration precision indexes and the recommendation values of water quality models including residual chlorine decay model and THM formation model are presented.

For the need of the development of the Qinhuangdao Port, based on the observed tidal data of many years at the port, the design water level and the check water level are calculated in this paper.

According to "Standard for Classification and Flood Control of Water Resources and Hydroelectric Projects"(SL252-2000) and "Classification & Design Safety Standard of Hydropower Projects"(DL5180-2003), the standard of Spillway Design Flood for first chop large scale earth and rockfill dam must be Probable Maximum Flood, or recurrence interval of ten thousand years.