Through studying the hydrogeological and hydrochemical character, of mineral water and using the new theory of environmental isotope hydrogeology and a new method of the WATCH water/rock balance comput-er program, one may date the water and deduce its recharge and run—off condition.

Application of Excel s VBA for the water balance;

Soil water distribution characteristics and water balance in winter wheat field under sprinkler irrigation;

Forestland evapotranspiration and water balance of Pinus tabulaeformis and Quercus variabilis mixed stand;

Measures are proposed for modifications of the design of the water quantity balance, water quality stabilization, process flow as well as energy saving of laminar cooling water treatment system through studying, comparing and analyzing the laminar cooling water treatment systems in hot-rolled band steel plants at home and abroad and based on our own design experience.

According to the water quantity balance equation,the rainfall and evaporation from the surface of the lake is analyzed,seepage quantity from vertical and horizontal sides of the lake is calculated with Darcy s Law,and the rain runoff discharging into Mengze Lake from the surrounding area is calculated also.

In order to satisfy function requirement, it s especially important to keep the landscape water quantity balance.

Based on analyses of water quantity and water quality balance for Baiyangdian Lake,a water quality model was established for the computation of water environmental carrying capacity.