Artesian aquifer in the context of "Heretaunga Plains"

Hydraulic head or piezometric head is a measurement related to liquid pressure (normalized by specific weight) and the liquid elevation above a vertical datum.It is usually measured as an equivalent liquid surface elevation, expressed in units of length, at the entrance (or bottom) of a piezometer. In an aquifer, it can be calculated from the depth to water in a piezometric well (a specialized water well), and given information of the piezometer's elevation and screen depth. Hydraulic head can similarly be measured in a column of water using a standpipe piezometer by measuring the height of the water surface in the tube relative to a common datum. The hydraulic head can be used to determine a hydraulic gradient between two or more points.

Jinan is the capital of the province of Shandong in East China. With a population of 9.2 million, it is one of the largest cities in Shandong in terms of population. The area of present-day Jinan has played an important role in the history of the region from the earliest beginnings of civilization and has evolved into a major national administrative, economic, and transportation hub. The city has held sub-provincial administrative status since 1994. Jinan is often called the "City of Springs" for its famous 72 artesian springs.

Jinan is listed as the # 27 city in the world for scientific research as tracked by the Nature Index according to the Nature Index 2025 Science Cities. The city is home to several major universities, including Shandong, Shandong Normal, Shandong Jianzhu, University of Jinan, Qilu University of Technology, Shandong University of Traditional Chinese Medicine and Shandong University of Finance and Economics. Notably, Shandong University is one of China's most prestigious universities as a member of the Double First-Class Construction. The city is rated Beta- (Global second-tier city) by the biannual GAWC ratings in 2020.