Figure 7 shows a map of part of the Styx River catchment. The catchment has a...

  

Transcribed Image Text:

Figure 7 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 50 m; an average hydraulic conductivity of 10-5m/s and an effective porosity of 0.25. (a) Draw water-level contours at 5 m water intervals on the map (Figure 7) (b) Draw flow-path arrows based on the contours and answer the following questions: (c) Indicate the main recharge area on the map. (d) Is the Styx river gaining or losing? (e) Assuming uniform hydraulic conductivity what proportion of ground-water recharge from Lake A reached the Styx River and what proportion reaches Lake B? (f) Calculate the volumetric flux of water from Lake A to Lake B and the Styx River, respectively. Please state all your assumptions. (g) How quick will contaminated water from Lake A reach Lake B and the Styx River, respectively. Please ignore the effects of dispersion and retardation. Please state all your assumptions Styx River The Styx River Catchment 01535.6 0152 001532.5 01550.4 01548.8 01552.0 1536.9 O o 1534.2 O 1549.6 1538.7 O 1553.0 01560.8 01558.1 O 1541.5 01542.7 O 1567.0 01551.1 01539.8 01537.0 2000 m 01555.8 01566.2 01540,8.. 01564.7 Lake B 1537.0m 01546.1 01561.3 01566.6 01545 O 1565.0 O 1535.8 61553 9 ³81567.2 01575.9 o 1550.9 0₁583 1579.6 O O 1573.1 1580 m 07565.0 01539.201551.7 Lake A 01549.5 1000 Scale Figure 7: Map of the Styx River Catchment 01589.3 O 1548.8 01576.1 01586.7 01565.0 01593.9 01575.4 01579.2 1578. 1586.3 01580.0 01576.7 01587.5 015811586.9 01555.6 01590.5 0 1576.4 01597.4 01555.2 01584.4 0 1596.5 01596.6 01592.3 01587.8 01555.6 01587.8 1583.3 01588.9 01581.2 01579.1 1586.3 1586.0 Legend Groundwater monitoring bore, water level in m Streams and rivers Lake Paper pulp mill Figure 7 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 50 m; an average hydraulic conductivity of 10-5m/s and an effective porosity of 0.25. (a) Draw water-level contours at 5 m water intervals on the map (Figure 7) (b) Draw flow-path arrows based on the contours and answer the following questions: (c) Indicate the main recharge area on the map. (d) Is the Styx river gaining or losing? (e) Assuming uniform hydraulic conductivity what proportion of ground-water recharge from Lake A reached the Styx River and what proportion reaches Lake B? (f) Calculate the volumetric flux of water from Lake A to Lake B and the Styx River, respectively. Please state all your assumptions. (g) How quick will contaminated water from Lake A reach Lake B and the Styx River, respectively. Please ignore the effects of dispersion and retardation. Please state all your assumptions Figure 7 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 50 m; an average hydraulic conductivity of 10-5m/s and an effective porosity of 0.25. (a) Draw water-level contours at 5 m water intervals on the map (Figure 7) (b) Draw flow-path arrows based on the contours and answer the following questions: (c) Indicate the main recharge area on the map. (d) Is the Styx river gaining or losing? (e) Assuming uniform hydraulic conductivity what proportion of ground-water recharge from Lake A reached the Styx River and what proportion reaches Lake B? (f) Calculate the volumetric flux of water from Lake A to Lake B and the Styx River, respectively. Please state all your assumptions. (g) How quick will contaminated water from Lake A reach Lake B and the Styx River, respectively. Please ignore the effects of dispersion and retardation. Please state all your assumptions Styx River The Styx River Catchment 01535.6 0152 001532.5 01550.4 01548.8 01552.0 1536.9 O o 1534.2 O 1549.6 1538.7 O 1553.0 01560.8 01558.1 O 1541.5 01542.7 O 1567.0 01551.1 01539.8 01537.0 2000 m 01555.8 01566.2 01540,8.. 01564.7 Lake B 1537.0m 01546.1 01561.3 01566.6 01545 O 1565.0 O 1535.8 61553 9 ³81567.2 01575.9 o 1550.9 0₁583 1579.6 O O 1573.1 1580 m 07565.0 01539.201551.7 Lake A 01549.5 1000 Scale Figure 7: Map of the Styx River Catchment 01589.3 O 1548.8 01576.1 01586.7 01565.0 01593.9 01575.4 01579.2 1578. 1586.3 01580.0 01576.7 01587.5 015811586.9 01555.6 01590.5 0 1576.4 01597.4 01555.2 01584.4 0 1596.5 01596.6 01592.3 01587.8 01555.6 01587.8 1583.3 01588.9 01581.2 01579.1 1586.3 1586.0 Legend Groundwater monitoring bore, water level in m Streams and rivers Lake Paper pulp mill Styx River The Styx River Catchment 01535.6 0152 001532.5 01550.4 01548.8 01552.0 1536.9 O o 1534.2 O 1549.6 1538.7 O 1553.0 01560.8 01558.1 O 1541.5 01542.7 O 1567.0 01551.1 01539.8 01537.0 2000 m 01555.8 01566.2 01540,8.. 01564.7 Lake B 1537.0m 01546.1 01561.3 01566.6 01545 O 1565.0 O 1535.8 61553 9 ³81567.2 01575.9 o 1550.9 0₁583 1579.6 O O 1573.1 1580 m 07565.0 01539.201551.7 Lake A 01549.5 1000 Scale Figure 7: Map of the Styx River Catchment 01589.3 O 1548.8 01576.1 01586.7 01565.0 01593.9 01575.4 01579.2 1578. 1586.3 01580.0 01576.7 01587.5 015811586.9 01555.6 01590.5 0 1576.4 01597.4 01555.2 01584.4 0 1596.5 01596.6 01592.3 01587.8 01555.6 01587.8 1583.3 01588.9 01581.2 01579.1 1586.3 1586.0 Legend Groundwater monitoring bore, water level in m Streams and rivers Lake Paper pulp mill