Figure 5 shows a map of part of the Styx River catchment. The catchment has a...

   

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Figure 5 shows a map of part of the Styx River catchment. The catchment has a paper pulp factory discharging polluted effluent into Lake A. As a consulting hydrogeologist you are commissioned to determine groundwater contaminant pathways from Lake A towards the Styx River and Lake B. The unconfined aquifer has an average saturated thickness of 40 m; an average hydraulic conductivity of 2.10-4 m/s and an effective porosity of 0.3. (a) Draw water-level contours at 5 m water intervals on the map (Figure 5) (b) Draw flow-path arrows based on the contours and answer the following questions: Indicate the main recharge area on the map. (c) (d) Is the Styx River gaining or losing? (e) (f) (g) Assuming uniform hydraulic conductivity, what proportion of ground-water recharge from Lake A reached the Styx River and what proportion reaches Lake B? Calculate the volumetric flux of water from Lake A to Lake B and the Styx River, respectively. Please state all your assumptions. How quick will contaminated water from Lake A reach Lake B and the Styx River, respectively. Please ignore the effects of dispersion and potential retardation. Styx River The Styx River Catchment 01535.6 01528 001532.5 1548.8 O 1534.2 1536.9 O 1000 O 1553.0 Scale 01550.4 1549.6 01552.0 1538.7 O 1541.5 01542.7 1558.1 01560.8 O 1567.0 O 1551.1 01539.8 1537.0 2000 m 01555.8 01540,8 Lake B 1537.0m 1566.2 01564.7 01561.3 01566.6 015487 1546.1 O1565.0 O 1535.8 15531567.2 01575.9 1579.8 O 1573.1 01550.9 1583.4 1580 m 01555.0 Lake A 01539.201551.7 01549.5 O 1586.3 01576.1 1548.8 01586.7 01575.4 01565.0 01593.9 01579.2 1578.7 1586.3 01576.7 1580.0 1555.6 01590.5 01587.5 01581.101586.9 01597.4 1576.4 01585.2 01584.4 0 1596.5 01592.3 01596.6 01587.8 01555.6 01587.8 01581.2 1583.3 01588.9 Lake 01579.1 O 1586.3 1581 m 1586.0 ←z Legend Groundwater monitoring bore, water level in m Streams and rivers Paper pulp mill Figure 5 shows a map of part of the Styx River catchment. The catchment has a paper pulp factory discharging polluted effluent into Lake A. As a consulting hydrogeologist you are commissioned to determine groundwater contaminant pathways from Lake A towards the Styx River and Lake B. The unconfined aquifer has an average saturated thickness of 40 m; an average hydraulic conductivity of 2.10-4 m/s and an effective porosity of 0.3. (a) Draw water-level contours at 5 m water intervals on the map (Figure 5) (b) Draw flow-path arrows based on the contours and answer the following questions: Indicate the main recharge area on the map. (c) (d) Is the Styx River gaining or losing? (e) (f) (g) Assuming uniform hydraulic conductivity, what proportion of ground-water recharge from Lake A reached the Styx River and what proportion reaches Lake B? Calculate the volumetric flux of water from Lake A to Lake B and the Styx River, respectively. Please state all your assumptions. How quick will contaminated water from Lake A reach Lake B and the Styx River, respectively. Please ignore the effects of dispersion and potential retardation. Styx River The Styx River Catchment 01535.6 01528 001532.5 1548.8 O 1534.2 1536.9 O 1000 O 1553.0 Scale 01550.4 1549.6 01552.0 1538.7 O 1541.5 01542.7 1558.1 01560.8 O 1567.0 O 1551.1 01539.8 1537.0 2000 m 01555.8 01540,8 Lake B 1537.0m 1566.2 01564.7 01561.3 01566.6 015487 1546.1 O1565.0 O 1535.8 15531567.2 01575.9 1579.8 O 1573.1 01550.9 1583.4 1580 m 01555.0 Lake A 01539.201551.7 01549.5 O 1586.3 01576.1 1548.8 01586.7 01575.4 01565.0 01593.9 01579.2 1578.7 1586.3 01576.7 1580.0 1555.6 01590.5 01587.5 01581.101586.9 01597.4 1576.4 01585.2 01584.4 0 1596.5 01592.3 01596.6 01587.8 01555.6 01587.8 01581.2 1583.3 01588.9 Lake 01579.1 O 1586.3 1581 m 1586.0 ←z Legend Groundwater monitoring bore, water level in m Streams and rivers Paper pulp mill