细化搜索
结果 91-100 的 207
Research on the physical aspects of thermal pollution
1971
Sundaram, Thirukurungudi Rangasamy
Instrumental analysis for water pollution control
1971
Mancy, Khalil Hasny
Urban storm runoff and combined sewer overflow pollution, Sacramento, California
1971
King, R. W. | Grimm, A.
Necessary data are not available in most areas to determine or predict distributions of storm water runoff and combined sewage flows and pollutant concentrations. To alleviate this problem, a procedure was developed to permit rapid, economical, and accurate assessments of system performance based on 3 different and important water quality criteria. The first criterion establishes an absolute maximum pollutant concentration which cannot be exceeded. The second criterion establishes an acceptable distribution of pollutant concentration by specifying the greatest frequency of occurrence for a particular concentration value. The third criterion establishes the maximum acceptable excession frequency for a particular pollutant frequency. A computer model was then used with a modified rational runoff method to perform preliminary design tasks and weigh alternatives to the designs. Then the least costly system developed for the Sacramento, California area as an example.
显示更多 [+] 显示较少 [-]Agricultural pollution of the Great Lakes Basin
1971
The report concerns pollution abatement in the Great Lakes Basin, specifically influenced by agricultural and related sources, including runoff and release of nutrients, pesticides, herbicides, and degradation by-products as affected by agricultural chemicals, runoff from animal and poultry production, and sedimentation. Current planning, advisory and regulatory functions of the two Governments is discussed. Some basic research of the joint study-group is summarized. Improper manure spreading or storing, and runoff from livestock feeding areas have the greatest potential impact on water quality. Pesticide contribution to environmental contamination is receiving closer scrutiny. The erosion problem is measured in sediment load in streams and deposition rate in reservoirs. High chloride levels, measured in tributary waters, seem related to road salt application. The adequacy of current legislation is discussed.
显示更多 [+] 显示较少 [-]Environmental pollution by chemicals
1971
Walker, C. H. (Colin Harold)
