YLN-SMT-HART/SDI12 is mainly used for the inputting type water level transmitter hydrological observation wells or inconvenience built costly.

SDI12投入式液位变送器主要用于水文站水位观测点不便建井或建井费用昂贵的地区。

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Useing of Dongting Lake hydrological observation stations, environmental monitoring data and on-the-spot investigation, Analysising of the Dongting Lake wetland on the N, P pollution-purification.

利用洞庭湖水文观测站、环境监测站和实地考察资料，分析了洞庭湖湿地对氮（N）、磷（P）污染的净化功能。

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And the height of water flowing fractured zone in overburden strata is calculated by the empirical formula and is measured with a simple hydrological observation method according to drilling on spot.

用经验公式对覆岩导水裂隙带高度进行了计算，采用简易水文观测法对覆岩导水裂隙带高度进行了测定。

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Inadequate hydrological and meteorological observation networks hamper response to extreme events.

UNESCO: MEDIA SERVICES