ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02869.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

ABSTRACTHydrologic response, defined as the ratio annual direct runoff divided by the annual precipitation, was calculated from 178 years of record on 55 watersheds less than 200 mi2in the State of Georgia. Direct runoff was determined from Geological Survey records by a universal method of hydrograph separation. Regression analysis showed that the effect of area and the deviation of actual from normal annual precipitation can be removed from the response ratio, revealing the average capacity of watershed source areas for releasing or detaining potential flood waters. A map of Georgia reveals a four‐fold range in the response ratio between major provinces, and another map of a small mountain watershed shows an eight‐fold range over a distance of three miles. The response ratio is proposed as a new mapping unit and its use in watershed planning and education is discus

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02870.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02871.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02872.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

ABSTRACTThe extensive use of synthetic organic pesticides in this country during the past twenty‐five years has resulted in widespread pollution of our water resources. An obvious detrimental effect of such pollution has been observed in the numerous fish kills that have occurred. The most widely used pesticides, and the ones that have been implicated in the vast majority of the pollutional episodes, are the chlorinated hydrocarbon insecticides. These compounds, generally speaking, have almost no solubility in water, are subject to very slow microbial degradation if any at all, and are so resistent to natural degradation forces they can persist almost indefinitely in aqueous environments; characteristics that are all detrimental from a stream pollution standpoint. In addition, studies have shown that, as a group, the chlorinated hydrocarbons are more toxic to higher forms of aquatic life than other chemicals widely used for pest control. Because of these undesirable characteristics, present trends are to discontinue using these highly toxic, persistent compounds for pest control in outdoor areas. Legislation banning the sale of DDT has been introduced. Similar legislation controlling the use of several of the chlorinated hydrocarbon pesticides is probably the most effective way to reduce pollutio

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02873.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02874.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02875.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02876.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02877.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1967.tb02878.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY