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Last modified
1/25/2010 7:13:55 PM
Creation date
10/5/2006 3:27:47 AM
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Floodplain Documents
County
Statewide
Community
State of Colorado
Basin
Statewide
Title
The NWS Dambrk Model Quick Users Guide
Date
6/20/1988
Prepared By
National Weather Service
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />--~,.... <br /> <br />NOTE: <br /> <br />QT <br /> <br />- <br /> <br />._._11 <br /> <br />.-, <br /> <br />I! <br /> <br />Appendix A-5 <br /> <br />crest (ft) less the length of the uncontrolled <br />spillway and gates; if HD is negative, COO is <br />entered as the average discharge coefficient (2.6- <br />3.2). If CDO is en tered as a negati ve value, the <br />breach will be via piping with the initial center <br />elevation (ft) of the pipe at l-cDOI. <br />Discharge (cfs) through turbines; this flow is <br />assumed constant from start of computations until <br />the dam is X breached; thereafter, QT is assumed to <br />linearly decrease to zero when y. breached. QT may <br />also be considered leaking or constant spillway <br />flow. If this flow is time-dependent, QT is <br />entered with any negative value and the time series <br />for QT is specified via card (12). <br /> <br />Cards (10-11) are always read-in for bridges, i.e., YO : 0,0; however <br />for dams (YO>O.O) they are omitted unless HD is specified with a <br />negative sign. <br /> <br />HSBR(K,L) <br /> <br />BSBR(K,L) <br /> <br />(10) HSBR(K,L) - 8 F 10.0 Format <br /> <br />Note: <br /> <br />( 12) <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Elevation (ft, m.s.l.) associated with widths of <br />bridge/culvert opening. Start at invert and <br />proceed upwards, K goes from 1 to NCS. Also, for <br />dams, elevations associated with the variable <br />length of the dam crest. L index goes from 1 to <br />MULDAM (card (2)) which may be maximum of 10; if <br />MULDAM : 0, L goes from 1 to 1. <br /> <br />(11) BSBR(K,L) - 8 F 10.0 Format <br /> <br />Width (ft) associated with bridge/c'Jlvert opening <br />corresponding to each elevation, HSBR(K,L). Also, <br />for dams, the variable length of dam crest for a <br />given elevation; L and K indices are the same as <br />described for card (10). <br /> <br />Card (12) is omitted unless QT (card (9)) is negative. <br /> <br />QTT(K,L) <br /> <br />QTT(K,L) - 8 F 10.0 Format <br /> <br />Variable discharge (cfs) through turbines; this flow <br />is time dependent; K index goes from 1 to ITEH <br />which can assume a maximum val~e of 50; L index is <br />same as described for card (10). <br />
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