MICHAEL KILGOUR STEWART Figure 1. Schematic map of the Takaka Valley - PowerPoint PPT Presentation

EVIDENCE OF MICHAEL KILGOUR STEWART

Figure 1. Schematic map of the Takaka Valley Golden Bay TWS Main Spring Takaka Valley granite gra vel d diorite marble marble Karst Karst Uplands Uplands granite Valley Takaka Rainfall River

Figure 2. Te Waikoropupu Springs complex

Table 1. Chemical compositions of samples Solutes shaded green are nutrients, those in yellow are from carbonate rock and those in blue are affected by input of sea water. Feature NO 3 -N DRP T Alk Ca Cl SO 4 Na K Mg TWS - Main Spring 0.43 0.004 203 64.0 111 19 65.0 4.9 9.2 TWS - Bubbling Sands 0.53 0.004 158 58.7 70 13.1 40.0 3.9 6.7 TWS - Fish Creek Spring 0.44 0.004 143 52.3 32 7.8 21.0 2.5 4.4 Takaka R, Lindsays Bridge 0.11 0.001 40 13.2 2.5 2.0 2.3 0.3 2.3

Table 2. Recharge and discharge flows in L/s to the Arthur Marble aquifer, and remainders attributed to submarine springs. Mueller Edgar (1998) Stewart & Thomas Source of recharge (1992) (min.) (2008) Karst Uplands 10,200 4,500 9,200 Takaka River 11,000 8,000 8,350 Valley Rainfall 2,200 2,200 2,200 14,700 – 20,000 Total recharge 23,400 19,750 Total discharge 15,000 13,300 13,300 1,400 – 6,700 Remainder 8,400 6,450

Table 4: Improved model of water flows within the Arthur Marble Aquifer .

Figure 4. Conceptual model of flows in the AMA

Figure 5. Deep and shallow AMA flow systems