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It would be necessary to  check for  available data such as baseline information when the project was commenced and then identify the possible variables that could have been affected with these activities. Identification of possible contaminants that can be discharged from the boats e.g diesel,petrol,oils, waste. There is also need to ascertain the levels  at which these parameters become a cause of concern and whether the required detection limits can then be reached during laboratory testing.

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I suggest that we rather review data on water quality of the existing lake (if any). Review maps of the area regarding land use and conduct interviews with citizens (people) living in the area and along the catchment.

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In this scenario, I will firstly suggest that we review available data on the existing lake (if any). Consult land-use maps to ascertain information on the sought of activities being carried out in the area around the lake; conduct interview with citizens (people) living around the lake for any relevant information. These will provide clues for further investigation.

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Objective: To determine whether recreational use, such as swimming and boating, in a small lake, presents a risk to the health of the users.

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Objective: To determine whether recreational use, such as swimming and boating, in a small lake, presents a risk to the health of the users.

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My preliminary survey will include water quality data analysis / review, to see how safe the water is for recreational use (e.g. presence of Cr 6+ wouldn’t be good for humans as it is toxic and causes skin rash) and if there are any human activities around passing contaminants into the lake. Water quality data review would be the first thing, because if the water is contaminated, it means water cannot be used for recreational purposes. If water is good, second thing is data review of hydro-logical
measurement (Flow rate and depth) to see if boating and swimming is possible. Influence of meteorological conditions on the lake would be part of field survey as winds may cause waves which makes it hard for swimming and canoeing / boating making the lake a hazard to human health.

Data review of water quality test results > hydrology review > field survey of meteorological conditions’ influence to lake.

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I would suggest carrying out a desk study on already existing literature about the lake. This provides information on the water quality, impact of human activity at the catchment and hydrology. To me this is decisive on what the monitoring programme would generate data on, given that the intended use of the water is known.

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Determine if there is any  Water Quality Data on the lake.Determine if there are point sources or non-point sources affecting the water quality of the lakes.Determine the variables that would indictate poor water quality of recreational water.

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I would do a Field survey to identify the accessibility of the small lake and also to determine whether the Lake stratifies with depth to assist in deciding the number of samples to be collected.
Field survey  would help me to check that the selected sampling points are appropriate for the program objectives.

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To determine the health risk of the lake.

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To determine the health risk of the lake.

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You have to undertake a water quality survey of the lake.

·         Gather and synthesize historical and available data and information on water quality of the lake.

·         Assess the land uses and the geology of the lake catchment to determine the possible adverse impacts on the water quality of the lake, specifically upstream of the catchment and around the lake. Is there any anthropogenic activity upstream of the lake that releases toxicants or any pollutant that might be washed into the lake through run off event?

·         On the premise of the above assessment and water quality standards for recreation choose the variables to be measured

·         Take water quality samples at different strategic points and in different depth in the lake for analysis

·         Analyze the data generated against the water quality standards for recreation to determine the risk to health.

Ntiea Letsapo

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I would commence with a collection and review of the existing information and data (#1 in the Components of a Preliminary Survey), specifically the study of the topographical and land use maps. This would give me a greater understanding of the general area surrounding the lake and the impact of human and agricultural practices surrounding the lake. Consequently, I would have gathered much information as to the kind of discharge made into the lake (this will assist in my further Field Evaluation of the water quality of the lake).

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Identification of sampling points,sampling requirements,sampling times to determine if water quality can be estimated at a single point or the lake is made up different water bodies with varying quality characteristics .
Also, consider water quality variations at different depths to determine if sampling from a single depth or a composite sample from two depths taking into account stratification is required.

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Collection of maps for the watershed, for example geology, topography, land use and land development plans.  To determine the possible natural water quality, pathways of water entering and leaving the lake, and possible source and future sources of water pollution.

(sorry about the other post, I just figure out how to log-in with my google account)

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