Table 12. Reach-segregated bed-material flux values for the Umpqua and South Umpqua Rivers, as calculated from surveys at mined sites, transport capacity equations, sediment yield analysis, and suspended-sediment measurements.

[Bedload flux: Estimates of bedload flux from suspended-sediment data from Curtiss (1975). Abbreviaton: FPKM, flood-plain kilometer; –, no data]

Reach name	FPKM	Range of surveyed fill volumes and net deposition rates	Calculated median transport capacity value 1951–2008 (metric tons)				Bed-material flux from sediment yield analysis (metric tons)	Bedload flux from suspended sediment measurements (metric tons)
			Parker-Klingeman-McLean	Parker-Klingeman	Parker	Wilcock-Crowe
Coast Range reach	40–152	–	56,440	53,740	20,280	24,165	30,500–49,800	195,200
Garden Valley reach	152–169	–	35,115	34,265	39,625	81,855	43,600–49,700	268,060
Roseburg reach	169–231	170–15,920	14,950	9,640	16,270	27,200	41,600–48,000	346,260
Days Creek reach	231–275	80–20,810	4,450	4,400	7,585	12,260	19,200–25,800	43,800

¹ From Elkton gaging station.

² Sum of Brockway and North Umpqua gaging stations.

³ From Brockway gaging station.

⁴ From Tiller gaging station.

First posted September 29, 2011