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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:11:21 PM
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UCREFRP
UCREFRP Catalog Number
9700
Author
Hayes, J.W., K.E. LaGory and G.L. Burton.
Title
Consideration of site-specific floodplain inundation thresholds in implementing peak flow magnitude and duration recommendations in the middle Green River, Utah.
USFW Year
2005.
USFW - Doc Type
Argonne National Labortory, Argonne, Illinois.
Copyright Material
NO
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<br />Green River Floodplain Inundation <br /> <br />16 <br /> <br />June 2005 <br /> <br />1200 <br /> <br />Old Charley <br />Wash-Main <br /> <br />! <br /> <br />Ci 1 000 <br />.c <br />- <br />"C <br />CD <br />- 800 <br />as <br />"C <br />C <br />:::s <br />C <br />as 600 <br />CD <br />... <br /><( <br />CD <br />> <br />:;::::; 400 <br />..!'!! <br />:::s <br />E <br />:::s <br />0 200 <br /> <br />Leota <br />Ponds <br /> <br />! <br /> <br />Johnson <br />Bottom <br /> <br />Horseshoe Baeser <br /> <br />Stewart <br />Lake <br /> <br />j <br /> <br /> <br />Thunder <br />Ranch <br /> <br />j <br /> <br />o <br />o 20 40 60 80 100 120 <br /> <br />Distance Downstream of Spawning Bar (km) <br /> <br />Figure 5. Cumulative Area of Priority Depression Floodplain in Relationship to Distance <br />Downstream ofthe Razorback Spawning Bar. There is no further change in inundated area of <br />priority depression floodplain until flows ~566 m3/s (20,000 cfs) are reached. Sportsman's Lake <br />and Sheppard Bottom, located at River Miles 14 and 58, are inundated by flows ~566 m3/s <br />(20,000 cfs) and ~716 m3/s (25,300 cfs), respectively. Source: Valdez and Nelson (2004). <br /> <br /> <br />Higher flows are unlikely to result in a greater. sustainable flooded area for a given <br />location because water drains from depression floodplains to the minimum height of the <br />surrounding levees (Figure 2). Thus, if a levee is notched to allow inundation at 368 m3/s <br />(13,000 cfs), the maximum sustainable flooded area is the area present at that level and any flows <br />above that elevation will only temporarily provide additional flooded area, much as a terraced <br />floodplain. The relationship shown in Figure 1 does not distinguish between areas that are <br />flooded for only brief periods of time (e.g., terrace floodplains) and those flooded for longer <br />periods (e.g., depression floodplains). Muth et al. (2000) identified that a peak flow of 527 m3/s <br />(18,600 cfs) would inundate a total of 514 ha (1,270 ac) of floodplain (both terrace and <br />depression floodplains). Because some levees have been removed since development of the flow <br />recommendations, approximately 891 ha (2,201 ac) of priority depression floodplains would be <br />inundated under a flow of 368 m3/s (13,000 cfs) and 1,027 ha (2,537 ac) under a flow of 396 <br />m3/s (14,000 cfs). Additional areas of terrace floodplain would also be inundated. Thus, even at <br />368 m3/s (13,000 cfs) or 396 m3/s (14,000 cfs) there would be more depression floodplain area <br />inundated than was identified as the total area of floodplain that would be inundated under the <br />Muth et al. (2000) flow recommendations. <br />
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