Technical Feasibility Research On Recharging The Hutuo River Groundwater With Water From Changjiang River

Shijiazhuang is terribly short of water, average water volume is 246m³/a per person ,only one eighth of that of the nation and lower than 500 m³/a which is recognized as the criterion of being extremely short of water in the world. Lack of water has been the bottleneck of Shijiazhuang's sustainable development of social economy. For a long time, 90% of the water needed in Shijiazhuang is supplied by groundwater, groundwater sustains the development of the city. Meanwhile, because of the excessive exploitation of groundwater, its level is descending at a speed of 2m/a in recent years, which has caused a series of social, economic and environmental problems.Recharging Shijiazhuang's Hutuo River groundwater funnel with the water from Changjiang River can relieve the tense situation of water lack and can at some degree solve the problems caused by groundwater level descending.But the technical feasibility of recharging the groundwater with Changjiang River in Hutuo River district needs researching, it includes: 1. Wether the hydrogeological condition in Shijiazhuang Hutuo River district is fit for groundwater recharge; 2. How is the quality of water from Changjiang River, wether it will pollute the groundwater in Hutuo River district if directly recharge it into the groundwater. 3.Wether rapid infiltration system(RI system) can effectively cleanse polluted water from Changjiang River.The article analyses hydrogeological condition of the future recharge field-Hutuo River shoal in detail, does the simulating experiment of managing NH₄⁺ and NO₃^- in the water from Changjiang River by RI system, and demonstrates the feasibility of managing COD and coliform by RI system with existing research production by other scholars. Finally, three conclusions are reached:1. The hydrogeological condition of Shijiazhuang Hutuo River district is fit for groundwater recharge, its volume of groundwater funnel is large enough for water from Changjiang River. 2. In most water from Changjiang River, only coliform'density excesses that of groundwater in Shijiazhuang Hutuo River district, as long as managing the coliform with simple measures, the water can be recharged into groundwater directly. But in a small quantity of water, the density of NH₄⁺, NO₃^-,COD and coliform excesses the local groundwater greatly, the water must be managed before being recharged into groundwater.3. It is convenient and feasible to manage the water from Changjiang River with RI system, and it can eliminate NH₄⁺,NO₃^-,COD and colifrom effectively in the water from Changjiang River.According to above three conclusions, we can prove that it is technically feasible to manage the water from Changjiang River with RI system.After reaching the conclusion of being feasible, on the basis of above research production and combining the sand lithology, existing artificial sand pit on Hutuo River shoal, the article put forward a water recharge project that is economical, feasible and fit for practical condition of Hutuo River shoal, which is of guide significance on theory and practice for the problems of groundwater recharge with surface water.