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

EVIDENCE OF MICHAEL KILGOUR STEWART

Karst Uplands

d

TWS Main Spring

granite granite diorite marble marble Karst Uplands Takaka Valley Valley Rainfall Takaka River Golden Bay gra vel

Figure 1. Schematic map of the Takaka Valley

Figure 2. Te Waikoropupu Springs complex

Feature NO3-N DRP T Alk Ca Cl SO4 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 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.

Source of recharge Mueller (1992) Edgar (1998) (min.) Stewart & Thomas (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 Total recharge 23,400 14,700 – 20,000 19,750 Total discharge 15,000 13,300 13,300 Remainder 8,400 1,400 – 6,700 6,450

Table 2. Recharge and discharge flows

in L/s to the Arthur Marble aquifer, and remainders attributed to submarine springs.

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