**Spatiotemporal Analysis of Groundwater Recharge Trends and Variability in Northern Taiwan**

Hsin‐Fu Yeh, Chen‐Feng Yeh, Jhe‐Wei Lee and Cheng‐Haw Lee

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/63508

#### **Abstract**

[31] Ahmad Z, Ashraf M and Siddiqui RF. Groundwater computer modeling of the National Park area in the vicinity of Rawal Lake, Islamabad, Journal of Drainage and Water

[32] Elci A, Molz FJ and Waldrop WR. Implications of observed and simulated ambient flow

[33] Ghulam M and Ahmad Z. Management of groundwater resources in Punjab, Pakistan, using a groundwater flow model, Journal of Environmental Hydrology. 2007; 15: 1–14.

[34] WAPDA, Lower Indus Report. Physical Resources, groundwater, supl.6.1.6, Tubewells

[35] WAPDA, Regional groundwater investigations in Islamabad and Rawalpindi areas,

[36] Ahmad K. Pakistan: Lei Nullah basin flood problem Islamabad-Rawalpindi cities, WMO/GWP Associated programme on flood management. www.apfm.info/publica‐

[37] Ahmad Z, Kausar R and Ahmad I. Implications of depletion of groundwater levels in three layered aquifers and its management to optimize the supply demand in the urban settlement near Kahota Industrial Triangle area, Islamabad, Pakistan, Environmental

[38] Ahmad Z, Kausar R and Ahmad I. Highlighting the implications of selenium dispersion from disposal of Kahota industrial triangle area, Islamabad, Pakistan using threedimension solute transport model, Environmental Monitoring and Assessment. 2010c;

[39] Poeter EP and Hill MC. UCODE, a computer code for universal inverse modelling,

[40] Gale I, et al. The effectiveness of artificial recharge of groundwater: a review, British

in monitoring wells, Ground Water. 2001; 39(6): 853–862.

supl.12. Ground water studies. Lahore, Pakistan. 1980.

Monitoring and Assessment. 2010b; 166(1–4): 41–55.

Computers and Geosciences. 1999; 25: 457–462.

Geological Survey, Commercial Report CR/02/108N. 2002.

Management. 1997; 1: 8–21.

26 Groundwater - Contaminant and Resource Management

and Boreholes. Lahore, Pakistan. 1965.

tions/casestudies (Accessed on May 5, 2016)

167(1–4): 565–579.

In this study, the base flow estimation method was used to assess long‐term changes of groundwaterrecharge in Northern Taiwan. The Mann‐Kendall test was used to examine the characteristics of the trends. This was followed by trend slope calculation and change‐point analysis. The annual groundwater recharge was found to exhibit a significant upward trend for the Fushan and Hengxi stations (Tamsui river basin). On the other hand, the Ximen Bridge station (Lanyang river basin) recorded a significant downward trend. Calculations showed that the rate of change for the Fengshan and Touqian river basins was small (less than 10%). However, that for the following stations was greater than 30%: Fushan, Hengxi, Ximen Bridge, and Niudou (also in the Lanyang river basin). The results of the change‐point analysis further indicated a significant change‐point for the annual recharge at Fushan, Hengxi, and Ximen Bridge stations in 1999, 1983, and 2001, respectively. The findings can be used for regional hydrological studies and as reference for water resource planning.

**Keywords:** groundwater recharge, base flow, Mann‐Kendall test, Northern Taiwan
