Grounderwater Resources Evaluation And Sustainable Utilization In Dawenhe Basin

Water is an indispensable and irreplaceable resource for life and production. The ground water resources are its important portion. The per capita water resources in our country is less than one fourth of the global average, and in Shandong province only one sixth for the per capita and one fifth for the per area.The Dawen River located in the downstream of the Yellow River has a drainage area approximately 9069 km2, where 6387.11 km2 are within Taian county. The multi-year mean of annual precipitation is 649 mm, and annual amount of streamflow and ground water resources are 1.74431 and 1.23758 billion m3, respectively. The total water resources amount is 23.4524 billion m3 after excluding their duplicate. The per capita and per area values are only 1/7 of the average value in our country. An increasing requirement in water resources has resulted in the conflicts due to water shortage with the rapid development of society and economy. To alleviate water shortage, people there overexploited groundwater without carefully scheming pumping wells, resulting in concussive decrease in groundwater level, ground surface crack, land subsidence. Therefore, Extreme shortage of water resources has become a key factor limiting social and economic development in the Dawenhe basin.Recharge and discharge amount of groundwater and its available for utilization in the Taian county and the groundwater source areas within the Dawenhe basin were estimated by using observation data from the year 1956 to 1993. An numerical groundwater modeling system was established on the basis of analysis of groundwater system in the Dawenhe basin. The hydrogeological parameters were then estimated through modeling calibration and validation. A reasonable groundwater table that preventing from environmental deterioration was determined on the basis of analysis of groundwater variations and their influences. An indicator system for evaluating a supporting capacity of groundwater resources was developed in order to evaluate the potential capacity of groundwater resources. This study will be very useful for planning groundwater utilization in the Dawenhe basin.