In this paper the water balance method is used to analyse groundwater resources and allowable exploitation quantity of karst fissure water in the Mishian basin.

Based on interference pumping-out test data of selecting water source of Yumenzhen,using hydrodecreasing method,calculated gang of wells′interference inflow of water and falling of groundwater level,in term of exploitation unchanged in exploitation period,evaluated it′s allowable exploitation according to evaluated resuls.

In view of this situation, based on generalizing of the complicated geological and hydrogeologic conditions in Fuzhou, a quasi-three-dimensional finite element numerical simulation of the geothermal water system is made in the paper, The allowable exploitation is also assessed and predicted.

The quantity of exploitation nowadays is 1446.66×104m3/a, the potential of development is bigger, incremental allowable exploitation quantity is 2463.75×104m3/a.

Secondly the dissertation calculates the amount of recharge, the storage capacity and the allowable exploitation by set-up the groundwater management information systems to combine the GIS and RS with the evaluation of

By far, water-supply source mainly depends on external surface water from the Yellow River and groundwater. By the latest calculation of groundwater balance, the amount of allowable exploitation of water resource from the shallow groundwater is 37.03 billion cubic meters, and that from deep groundwater is 2.62 billion cubic meters.

In Gangjingzi district, the typical area, the calculation model of allowable groundwater exploitation is built by the method of artificial neural network.

In this paper the water balance method is used to analyse groundwater resources and allowable exploitation quantity of karst fissure water in the Mishian basin. The long - term groundwater observation data and hydrogeological data are used in the calculation of hydrogeological parameters. The mathematical model of karst fissure water is established on this basis, and further evaluation of groundwater resources is made by using finite element method. The result is satisfactory.

On the basis of qualitatively analyzing the recharge, run-off and discharge conditions of ground water in Gaoqing Plain, authors propose that it should be regarded as a principle of ground water resource evaluation to transform useless evaporation of phreatic water into avail-able water resource. Then the mathematical model describing two-dimensional unsteady subsur-face flow in the heterogeneous aquifer was established in accordance with the hydrogeological conditions. Also rational parameters were selected...

On the basis of qualitatively analyzing the recharge, run-off and discharge conditions of ground water in Gaoqing Plain, authors propose that it should be regarded as a principle of ground water resource evaluation to transform useless evaporation of phreatic water into avail-able water resource. Then the mathematical model describing two-dimensional unsteady subsur-face flow in the heterogeneous aquifer was established in accordance with the hydrogeological conditions. Also rational parameters were selected in the light of a vast amount of actual materi-als. Meanwhile finite element method was employed to quantitatively predict the water table and buried depth after different exploitation schemes.On the premise of guaranteeing the water quantity balance and by comparing the different water table depths after all plans, the conclusions how to rather rationally extract water re-sources were reached based on the two different hypothetic precipitation series: (1) the precipi-tation series from 1975 to 1989; and (2) the average precipitation series coming from several decades.Subject to the hypothesis (1), the allowable exploitation in the phreatic aquifer is about 142. 5 millions cubic meters per year in case that the Yellow River keep flowing and can be chan-neled from it for irrigation, while 128. 0 millions cubic meters per year in case that the Yellow River dry up. Similarly, subject to the hypothesis (2), the allowable exploitation is about 168- 4 millions cubic meters per year in case the Yellow River keeps flowing, while 140. 0 millions cu-bic meters in case the Yellow River dries up.The research results manifest that the ground water is rather abundant and the extraction in current situation accounts for about one forth of the allowable exploitation of the phreatic wa-ter. As a result the phreatic aquifer has great potentialities for exploitation. At the same time, the water table would become lower and the evaporation discharge become smaller with the ex-ploitation of ground water, which would be bound to produce positive environmental effects.

Shulehe River basin is an important area of immigrant settlement and agriculture development, and is also the largest area with the potential water resources for carring out the strategy of "Reconstructing Hexi" in Gansu Province. It is extremely urgent to improve the study level on water resources and its circulation and transformation relations, meantime to try to find and solve the existing problems in exploitation and utilization of water resources. All kinds of water resources in the river basin are calculated...

Shulehe River basin is an important area of immigrant settlement and agriculture development, and is also the largest area with the potential water resources for carring out the strategy of "Reconstructing Hexi" in Gansu Province. It is extremely urgent to improve the study level on water resources and its circulation and transformation relations, meantime to try to find and solve the existing problems in exploitation and utilization of water resources. All kinds of water resources in the river basin are calculated and evaluated, such as precipitation, glaciers, surface water, groundwater (including its recharge, allowable exploitation and storage ) and total water resources, based on collecting a lot of data about hydrology, hydrogeology, water conservancy projects, and so on. The characteristics of water resources can be concluded as follows: all water resources is from precipitation, glacial melt is an important part, surface water at the debouchure is consisted of precipitation, glacial melt and mountainous groundwater, groundwater in the cooridor plain is transfored from the surface water, is mostly recharged by the infiltration of stream water including that from irrigation ditches and farmland in the middle reaches, which occupies 79.29%～92.74% of the total; it is mainly recharged by the infiltration of spring water is the lower reaches, which occupies 58.81%～75.04% of the total. The total volume of water resources is about 18.62×10 8m 3·a -1 . It is very rich in groundwater resources in the middle and lower reaches because of the accumulation and storage of groundwater here, and it has 14.38×10 8m 3·a -1 recharge resources, 5.75×10 8m 3·a -1 exploitable resources and 7384×10 8m 3 storage resources, but the current volume of exploited groundwater only occupies 28.17% of the exploitable resources and 11.27% of total recharge. Therefore, there are the great potentialities to exploit groundwater, and some existing problems,such as the domination of surface water, inefficient utilization of water resources, and low exploiting level of groundwater, should be solved.