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Last modified
1/26/2010 10:09:15 AM
Creation date
10/5/2006 4:19:31 AM
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Floodplain Documents
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Statewide
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Statewide
Title
Floodway Determination Using Computer Program HEC-2: Document Number 5
Date
5/1/1974
Prepared For
US
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />for the two prel1.inary profiles and were specified with Method 1. An <br />8.4 encroachment was specified for the next three sections (0.55, 0.66. <br />and 0.94) and a 10.4 encroachment was specified for the last two sections. <br />The input for second trial is shown on page 1 of Appendix III. <br />For the second trial. the first profile is a natural profile as <br />before. The second profile reflects the combination of encroachments <br />as discussed. A third profile was also COlllpUted us~ng Method 1 to <br />read in selected encroachlllent stations. To select the stations. the <br />COlllputed stations frOlll the first run were located on the cross section <br />plots. Some of the computed encroachment stations would require exces- <br />sive fill on the floodwaYi therefore. they ~re adjusted based on <br />cross section geometry. The adjusted stations were input for the third <br />profile. <br />The Method 1 encroachment option requires reading in the stations <br />of left and right encroachlllent. The data can be read in on an X3 card <br />for a single profile run or on an ET card for multiple profile run. Only <br />one field is read on the ET card for a given profile and that field is <br />called by variable INQ on the Jl card. To read both left and right <br />encroachment stations. additional fields on the ET card are required. <br />The INQ field of the ET card contains the ET card field number ~ for <br />the location of the left encroachment station, a decimal point. and <br />then the number 1 for Method 1. The right encroachment is specified <br />in field (N+l) of the ET card. For example, a 9.1 would indicate <br />Method 1 with encroachment stations in fields 9 and 10 of the ET card. <br />Using the ET card allows the user to run a natural water surface pro- <br />file as well as encroachment profiles using Method 1. This would not be <br /> <br />14 <br />
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