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<br />2 <br /> <br />TECHNICAL MANUAL <br /> <br />LIMITATIONS OF METHODS <br /> <br />The following I imitations need to be observed when usin!) the methods <br />presented in this manual. <br /> <br />1. They are not applicable to urban areas unless the effects of urbani- <br />zation on flood characteristics are insignificant, An example of this condi- <br />tion would be a large stream flowing through an urban area~ <br /> <br />2. They are not appl icable to streams where manmade works, such as im- <br />proved channels, flood-detention structures, storage reservoirs, and major <br />diversion structures, have a significant effect on flood discharges or depths. <br />For those conditions, open-channel hydraulic studies or stream-system studies <br />will be required to evaluate flood characteristics, <br /> <br />3. Esti~ating techniques are least reI iable for sites on streams ;n <br />mixed-population flood areas, Flood-estimating techniques for these streams <br />need to be studied in more detai I, but an interim estimating technique is <br />presented. <br /> <br />4. The applicabil ity of regression equations for computing flood charac- <br />teristics at ungaged sites having basin and climatic parameters outside of the <br />ranges 1 isted in the tables at the back of the report, is untested and, there- <br />fore, unkno'dn. <br /> <br />5. The flood-depth estimating equations should not be used in reaches of <br />streams affected by backwater from downstream structures, <br /> <br />- <br />