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Water Engineering and Development Centre
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Below are the graphics for WEDC Graphics: Environmental assessment
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000 Non-compliers to improvers | 004 A pond or lake | 005 Lake environments | ||
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006 The water cycle | 007 Energy cycle | 008 Simplified carbon cycle | ||
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009 The nitrogen cycle | 010 Terrestrial succession | 011 Aquatic succession | ||
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012 A core sample through sediment | 013 'S' and 'J' growth curves | 014 'Prey and predator dynamics | ||
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015 A series of readings | 016 A few readings | 017 An instantaneous reading | ||
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018 A concept sketch of a steady state equilibrium | 019 A concept sketch of a seasonal equilibrium | 020 Concept sketches of dynamic equilibria | ||
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021 A concept sketch of a meta-stable equilibrium | 022 A concept sketch of dynamic meta-stable equilibrium | 023 A concept sketch of negative feedback | ||
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024 A concept sketch postive feedback | 025 Concept sketch of robustness for two ecosystems having the same external adverse impact | 026 Concept sketch of resilience for two ecosystems having the same external adverse impact copy | ||
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027 Concept sketch of recurrence | 028 Thresholds | 029 Altering thresholds | ||
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030 Dynamic equilibrium and thresholds | 031 Linear Variation along a river | 032 Depth Variation in a lake | ||
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033 Depth distance and concentration variation in groundwater | 034 Immediate | 035 Delayed | ||
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036 Continuous | 037 Intermittent-recurring | 038 Acute | ||
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039 Chronic | 040 Reversible | 041 Persistent degrading | ||
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042 Independent | 043 Cumulative | 044 Cumulative over time | ||
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045 Synergistic | 046 Source pathway receptor | 047 Attenuation of a plug of pollutant | ||
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048 Driving forces and pressures affecting South Africa's inland water resources | 049 Plans and cross sections of natural and man-made rivers | 050 Plans and cross sections of the river Thames before and after environmental improvements | ||
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051 Saline intrusion | 052 Saline soils | 053 Stages of degradation | ||
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054 Dilution effects of waste water discharges | 055 Schematic representation of the chages in water quality | 056 The growth of bacteria in response to organic debris | ||
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057 BOD demand reaction showing Carbonaceous and Nitrification Demand Curves | 058 The impact of mixing and turbulence on DO levels with depth | 059 The dissolved oxygen sag curve | ||
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060 The effect of parameter chages on DO sag curves | 061 Exceedance of standards | 062 Design criteria for disposal of surface water drains to groundwater | ||
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063 Number of developers | 064 Lightening impact | 065 Map layers | ||
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066 Output of beer | 067 Interpretations of the environment | 068 Taxa | ||
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069 Steady times | 070 Equilibriums | 071 Compact or long perimeter | ||
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072 Diffuse and point sources | 073 Growth of supplies and demands | 074 Indirect or direct | ||
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075 Large or small | 076 Linked or separate | 077 Linked to the surrounding area | ||
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078 One large or several small | 079 Trophic levels | 080 Widespread or localized | ||
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Four components of the decline and recovery of river water quality | How energy and inorganic matter move through an eco-system | Natural processes leading to the purification of discharges in flowing waters |
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