This website uses cookies to ensure you have the best experience. Learn more

Lake Sediment Essay

1121 words - 5 pages

Practical 5
Lake Sediments


Three lakes in the University of Waikato act as stormwater detention systems. Stormwater from various sources in the campus is directed into the Knighton Lake, Oranga Lake and Chapel Lake. As part of the detention system, the lakes are expected to allow some contaminants to be deposited into the sediments.

For each of the three lakes, sediment samples are taken from ten different locations within each of the lakes. The sediment samples are examined for five particular metals. These are Nickel (Ni), Copper (Cu), Zinc (Zn), Arsenic (As) and Lead (Pb).

The purpose of this report is to find out what the level of each metal contaminant in ...view middle of the document...

27 | 25.35 | 249.13 | 4.21 | 24.67 |
| | | | | |

The Oranga Lake results when compared against the guidelines showed that nickel and lead levels are below the trigger value and the arsenic, copper and zinc are above the trigger value. Zinc level is found to be at extremely high levels, it is 1,092 ppm higher on average in comparison to the ISQG-High value.

Table 3. Metals concentration in sediments from Chapel Lake,
University of Waikato, 2000
| Ni | Cu | Zn | As | Pb |
minimum (ppm) | 5 | 15 | 52 | 5 | 78 |
Maximum (ppm) | 8 | 26 | 247 | 9 | 177 |
Mean (ppm) | 6 | 20 | 106 | 7 | 137 |
standard Deviation | 0.92 | 4.17 | 60.06 | 1.37 | 35.11 |
| | | | | |

The Chapel Lake results when compared against the guidelines showed that nickel, copper, zinc and arsenic are below the ISQG-Low value. The level of lead in the sediment is found to be at a high level, below the ISQG-High value but is above the trigger value of 50 ppm.


In each of the three lakes, nickel is the only metal contaminant in the sediments that is below the levels recommended in the ANZECC, 2000 guidelines. Meaning that little or no further nickel metals are entering the lakes, we could conclude that nickel found in the lake is naturally forming. Zinc levels for both the Knighton and Oranga Lakes are very high. From the stormwater map the lakes that have high levels of zinc and arsenic has a lot of stormwater directed to it and has minimal amount of vegetation.

The zinc level in the two lakes is at a high level and I consider it to be a problem. One major effect of increased zinc level in the lakes is that the acidity level will increase. Another is that some fish can accumulate zinc in their bodies. A possible source for the amount of zinc in the lakes is the use of zinc as coating on steel to avoid corrosion. Many building in the campus have a corrugated roof coated with zinc to avoid rusting.

The Chapel Lake showed the least amount of contamination in all five metals tested, the only metal above the trigger level is the lead concentration (Table 3). Based on this, we can assume that the Chapel Lake is healthier than the other two lakes. This could be due to the smaller size and more vegetation...

Other Essays Like Lake Sediment

Project 2 Aquatic Micro Essay

2439 words - 10 pages zone is the floor covered with sediment that settles. Populations of microbiota in bodies of fresh water are very dependent upon the availability of assessable light and oxygen. Light is the more important resource due to photosynthesis in algae being the main source or organic matter and therefore energy of the lake. Photosynthetic algae are the primary producers of a lake in that they support the population of bacteria, protozoa, fish, and

Oceanography Essay

4196 words - 17 pages large fan-shaped deposit commonly found on the continental rise seaward of such sediment-laden rivers such as the Amazon, Indus, or Ganges-Brahmaputra | Pelagic | Any water in a sea or lake that is neither close to the bottom nor near the shore | Manganese nodules | A concretionary lump containing oxides of manganese, iron, copper, cobalt, and nickel found scattered over the ocean floor | Hydrothermal vents | Ocean water that percolates down

Geography Water Cycle

4277 words - 18 pages Density of of soil / rock / overgrazing Over-tapping of ground water ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( )Fluvial depositionIt takes place when river has insufficient energy to transport its load.Factors leading to fluvial depositionin river velocitywhen there is a in gradient of a riverwhen river enters a lake / calm seaX Y X Y Outer side bend - active fluvial erosion Inner side bend - active depositionat the inner side of

Big Bang Theory

1572 words - 7 pages by primary consumers that are either attached to or crawl along the sediments at the bottom of the lake. Such bottom-dwelling animals are called the benthos. The sediments underlying the profundal zone also support a large population of bacteria and fungi. These decomposers break down the organic matter reaching them, releasing inorganic nutrients for recycling. Fall overturn Where there is a pronounced change of seasons, the warming of the


1377 words - 6 pages different plant species: a) Open water algae (phytoplankton) b) Attached algae (periphyton) c) Higher plants (macrophytes) Above all, these organisms encourage the growth of algae, which absorb dissolved oxygen in the water essential for the survival of fish populations. Occasionally, the decomposition of newly-submerged biomass and sediment further reduce the water's oxygen content. Water sources can literally choke to death as a

Discussions on Environmental Ethical Issues

853 words - 4 pages the Great Lakes Legacy and Brownsfield Legislation. The Great Lake Legacy authorized the federal government to begin clean up regarding pollution and contaminated sediment in the great lakes. The Brownsfield Legislation was to accelerate the cleanup of abandoned industrial sites or brownfields to better protect public health, create jobs and revitalize the communities. The environmental agency issued a Climate Action Report in 2002 stating that

Water Pollution

2781 words - 12 pages of assessed lake acres, and 32 percent of assessed bays and estuarine square miles were classified as polluted.[6] Water is typically referred to as polluted when it is impaired by anthropogenic contaminants and either does not support a human use, such as drinking water, and/or undergoes a marked shift in its ability to support its constituent biotic communities, such as fish. Natural phenomena such as volcanoes, algae blooms, storms, and

The Grand Canyon

1554 words - 7 pages , near the northern boundary of Arizona, to Grand Wash Cliffs, near the Nevada line, a distance of about 277 miles (446 km). The canyon includes many tributary side canyons and surrounding plateaus. The deepest and most impressively beautiful section, 56 miles (90 km) long, is within Grand Canyon National Park, which encompasses the river's length from Lake Powell to Lake Mead. In its general colour, the canyon is red, but each stratum or group of

Genetic Basis of Parental Care in Cichlid Fish

3711 words - 15 pages of sediment, inside shells on the sandy bottom of the lake, or in a small alcove or cave. The eggs then remain in this location, where they are protected by the parents (Sefc 2). In mouth-brooding, the eggs are taken up into one or another parent’s mouth and incubated for some period of time, typically in the range of two to three weeks. In biparental mouth-brooders, the eggs are periodically transferred between the male and female parents

Water Pollution

2903 words - 12 pages most recent national report onwater quality in the United States, 45 percent of assessed stream miles, 47 percent of assessed lake acres, and 32 percent of assessed bay and estuarine square miles were classified as polluted.[6] Water is typically referred to as polluted when it is impaired by anthropogenic contaminants and either does not support a human use, like serving as drinking water, and/or undergoes a marked shift in its ability to

Soundtrack to a Schizophrenic Mind

3182 words - 13 pages grew up, but somewhere in this process I disconnected from the positive energy that was individual and beautiful. Regret. That's the sediment of feeling disturbing my mental solution, visible only once the solute of pride and perfectionism boils away. Had I been able to accept my mistakes in school and in love, forgive myself and step foreword, with pure heart, with lovingkindness, with the sanskrit metta, free of it would all be

Related Papers

Lake Tana Seismic Essay

1042 words - 5 pages Seismic data from Lake Tana, Ethiopia, has been analysed and the key reflection events have been picked. These have then been dated using an age depth model from previously obtained cores from Lake Tana. The airgun data from Lake Tana aided the identification of the bedrock below the accumulated sediment in the Lake Tana basin. The bedrock was dated to 410 k yr BP ± 22 k yr BP, and this indicates that there is a possible 410 k yr

It's Time To Drain Lake Powell

900 words - 4 pages fact “that sediment accumulation would force decommissioning of the dam within two hundred years of its completion” (Living Rivers: What about the sediment?). That means that the dam has been temporary from the beginning. The sediment that is accumulating below ‘Lake’ Powell contains, in large amounts, heavy metals and toxins leaking from watercraft, farms and uranium tailings. This is yet another reason that the reservoir should be drained now

Tamu Geol 101 Final Study Guide

4880 words - 20 pages deposit sediment when discharge decreases, water depth decreases, slope decreases, and velocity decreases o Alluvial fans- fan shaped masses of alluvium formed when streams flowing through narrow bedrock channels in a mt range enter a broad valley where there are no walls to confine flow o Delta- landform produced by deposition of sediment where a stream enters a lake, reservoir, or sea ▪ Distributary channels- bars and

Eruption Of Mt. Saint Helens In 1980

500 words - 2 pages erupted on May 18th and an earthquake of magnitude 5 on the Richter scale had occurred. The earthquake had shaken the bulge that was formed in early May. The released material caused a landslide containing rock, glacier ice and soil. This landside filled Spirit Lake, and displaced the water. The exposed magma exploded sideways sending out blast waves of volcanic gas, steam and dust which are called nuee ardente.As people didn't expect Mt. St