Table 2: Erosion depths measured in meadows on NFS lands in the Sierra Nevada, Mean erosion Number of Percentage of Average area Average depth depth range meadows total (ha) (m) (m) 0.0 32 29 7.1 0.0 0.0 to 0.6 47 42 10.0 0.4 >0.6 32 29 16.7 1.1 Table 3: Summary of meadow hydrologic regimens from previous studies Reference Study Area Meadow Date of Period with Period of Period of Annual condition water table water overbank no surface water rise table @ flow flow table land drop (m) surface Wood, 1975 Yuba River, 2,225 m Unincised September November April-June 0.6 to to 1.2 late October Hammersmark Bear Creek, 1,010 m Restored Mid-July to 1.5 to and others, December late 3.5 2008 Loheide and Alkalai Flat, Last Restored October April April None 1.5 Gorelick, 2007 Chance watershed, 1,680 to 2,350 m Loheide and Big Flat, Last Restored April April None 1.5 Gorelick, 2007 Chance watershed, 1,680 to 2,350 m Loheide and Doyle Crossing October- April None 1.4 Gorelick, 2007 Meadow, Last November Chance watershed, tributary; 1,680 to 2,350 m nearby meadow incised 2 m Loheide and Coyote Flat, Last February None None None 1.8 Gorelick, 2007 Chance watershed, 3-5 m 1,680 to 2,350 m Hammersmark Bear Creek, 1,010 m November None None Mid-July to 1.0 to and others, 2 m (2005) late 2.0 2008 Late November (2006)
Table 2: Erosion depths measured in meadows on NFS lands in the Sierra Nevada, Mean erosion depth range (m) Number of meadows Percentage of total Average area (ha) Average depth (m) 0.0 32 29 7.1 0.0 0.0 to 0.6 47 42 10.0 0.4 >0.6 32 29 16.7 1.1 Table 3: Summary of meadow hydrologic regimens from previous studies Reference Study Area Meadow condition Date of water table rise Period with water table @ land surface Period of overbank flow Period of no surface flow Annual water table drop (m) Wood, 1975 Yuba River, 2,225 m Unincised September April-June to late October 0.6 to 1.2 Hammersmark and others, 2008 Bear Creek, 1,010 m Restored Mid-July to late November 1.5 to 3.5 Loheide and Gorelick, 2007 Alkalai Flat, Last Chance watershed, 1,680 to 2,350 m Restored October April April None 1.5 Loheide and Gorelick, 2007 Big Flat, Last Chance watershed, 1,680 to 2,350 m Restored April April None 1.5 Loheide and Gorelick, 2007 Doyle Crossing Meadow, Last Chance watershed, 1,680 to 2,350 m tributary; nearby meadow incised 2 m October- November April None 1.4 Loheide and Gorelick, 2007 Coyote Flat, Last Chance watershed, 1,680 to 2,350 m 3-5 m February None None None 1.8 Hammersmark and others, 2008 Bear Creek, 1,010 m 2 m November None (2005) Late December (2006) None Mid-July to late November 1.0 to 2.0
54_Meadow_GW_Final_report_June_2015.docx