The design value of maximum wind speed and maximum snow cover depth are calculated,these are very important to the railway project design and the railway running.

Based on both the law that wind varied with the height and the distributive function of Extrem type-I,ten minute average and instantaneous maximum wind speeds at both 10 meters and 15 meters were calculated at different return peringods and then the design wind speed which a building can be.

The results show that maximum wind speeds at most mete.

Determination of design wind speed of sprinkler irrigation projects by means of marginal analysis theory;

According to the wind speed distribution function of exponent rule,the accurate wind power produced by two different math treatment ways which passes through the rotor on swept area in two reference frame is compared with the wind power produced by taking wind speed at the rotor centre as the design wind speed.

The authors,pointing on the features of 1 000 kV AC EHV and ±800 kV DC EHV transmission lines,compared them with the international IEC standards and inquired into the rational values for design wind speed and its basic height.