68 Fresh-water Biology 



Study 2 

 THE LOCAL WATER SUPPLY 



Work Program: 



1. A study of local weather records of rainfall and temperature (Summaries supplied 



by the U. S. Weather Bureau). 



2. An inspection of a local water purification plant. (The courteous cooperation of 



the manager of the plant will be necessary.) 



3. Reading in text Life of Inland Waters, pp. 25 to 42 and in Ward and Whipple's 



Fresh Water Biology, Chapter XXXI. 



For record include: 



1. Plotted curve of mean annual precipitation by months. 



2. The same, for temperature. 



3. A brief statement of the source of the local supply of public drinking water (with 



sketch map, if not already shown on the maps of Study I); nature of supply; 

 catchment area; principal sources of pollution therein; location of filter plant; 

 place of storage after filtration, etc. 



4. A simple diagram to explain treatment of the water as it passes through the filter 



plant. Show where (1) coagulation, (2) sedimentation, (3) filtration and (4) ster- 

 ilization successively occur and tell means whereby accomplished. 



Study 3 

 A POND 



Work Program: 



1. An examination of the physical features of a small pond. 



2. Reading in Life of Lnland Waters, pp. 59 to 76. 



For Record include: 



1. A sketch map of the pond (showing bottom contours, if soundings have been 



made). 



2. Vertical section of same, with longitudinal and vertical scale selected to fit size 



of note book used. 



3. A description of the pond with notes arranged under the following principal head- 



ings: 



A. Name: kind of pond (mill-dam, natural pond, etc.) 



B. Water: its color, transparency, temperature, etc. 



C. Banks: elevation, percentage of area, overhung, vertical, sloping, flat, etc. 



D. Bed: 



(a) Percentage of its area covered with mud, sand, gravel, boulder, flat 



rock, hard clay, etc. 



(b) Percentage of its area covered with emergent and floating plants, with 



submerged weed beds. 



E. Miscellaneous: Pollution, sources, nature, and other artificial alterations; 



constructions, plantings, etc. 



