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FLOOD09481
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1/26/2010 10:09:22 AM
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10/5/2006 4:22:50 AM
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Title
Practices in Detention of Urban Stormwater Runoff
Date
1/1/1974
Prepared For
American Public Works Association
Prepared By
American Public Works Association
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />implementation of major stormwater <br />detention facilities should seek the advice and <br />assistance of a competent attorney qualified <br />in urban drainage law prior to construction of <br />such facilities. Officials of public agencies <br />having responsibility for local drainage should <br />review their authority for requiring detention <br />of stormwater runoff and consider the <br />adoption of needed legislation pertaining to <br />detention storage of runoff. <br /> <br />Operation and Maintenance <br />The operation and maintenance of <br />storm water detention facilities is an <br />important factor in determining the <br />effectiveness of the facility and its <br />acceptability to the public. Poor operation <br />and maintenance not only reduces the <br />usefulness of detention storage, but can cause <br />the facility to become an eyesore, nuisance or <br />health hazard. When storm water detention is <br />weighed against other methods of runoff <br />control, maintenance and operation is usually <br />viewed as the most difficult problem and the <br />factor most often mentioned against the use <br />of this method. This was revealed by the <br />surveys made in this study the results of <br />which are discussed below. <br />Survey Results: The results of surveys <br />made of both public agencies and engineering <br />firms clearly underline the importance of <br />operation and maintenance difficulties. In <br />each of these surveys, a question was asked to <br />solicit the respondent's evaluation of each of <br />various possible factors that might be <br />considered to constitute a problem or an <br />adverse condition that would be viewed as a <br />disadvantage of stormwater detention. Table 4, <br />Apparent Adverse Factors, includes <br />tabulations of the responses of representatives <br />of the public agencies and engineering firms <br />which responded to this question. <br />From Table 4a it is noted that 54 <br />percent of the public agency respondents feel <br />that operation difficulties exist in connection <br />with on-site detention of runoff. About <br />two-thirds of these respondents consider that <br />significant problems would be encountered <br />wi th aesthetics, mosquito breeding, algal <br />growth, and safety hazards. Table 4b shows <br />that most design engineers feel that significant <br />problems would be encountered with general <br /> <br />TABLE 4 <br />Apparent Adverse Factors of On-Site DetentiOJl <br />(a) As Seen by Public Agencies <br /> <br />Factor <br /> <br />No. of Agencies Reporting <br />Yes No <br /> <br />Aesthetics of empty ponds <br />is poor 101 61 <br />Mosquito breeding would <br />increase 107 56 <br />Algal growth would occur in <br />shallow ponds 108 48 <br />Operation difficulties exist 81 69 <br />Ponds are a safety hazard <br />to children 92 54 <br />Other adverse effects <br />are foreseen 18 5 <br /> <br />(b) As seen by Engineering Firms <br /> <br />Factor <br /> <br />No. of Firms Responding <br /> <br />Yes No <br /> <br />General maintenance <br />and operation 31 2 <br />Sedimentation 26 7 <br />Safety of children 23 8 <br />Safety and/or property <br />loss from dam failure 21 10 <br />Mosquito breeding 16 15 <br />Aquatic vegetation 14 16 <br />Other 9 3 <br />Source: 1972 Survey by APWA <br /> <br />maintenance and operation, particularly in <br />the areas of safety of children, property loss <br />from failure of dams, and sedimentation. <br />About one-half of the engineers are concerned <br />about mosquito breeding and growth of <br />aquatic vegetation. <br />These tables show the concern of public <br />officials and design engineers for problems of <br />maintenance and operation, but they give no <br />indication of the seriousness of the problems. <br />Although the responses concerning the <br />adverse effects of detention might indicate <br />that these disadvantages could make <br />storm water detention an unworkable method, <br />the successful use of detention storage shows <br />that these problems are not sufficient in <br />themselves to eliminate the method as a <br /> <br />19 <br />
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