Table 4: Previous studies of streamflow changes following restoration of Sierra Nevada meadows Reference Study Bedrock Average Type of Type of Changes to area geology annual analysis comparison streamflow precipitation following (mm) restoration/erosion Hammersmark Bear basalt 508 Model Before and Slight decrease in and others, Creek, after baseflow duration 2009 Lassen restoration and volume within County meadow, increase in baseflow volume downstream of meadow Ohara and Last granodiorite, 428 Model Before and Increased others, 2013 Chance pyroclastic after baseflow volumes Creek, flows,underlain restoration Plumas by lacustrine County clay Tague and Trout Granodiorite 500 to 1,000 streamflow Before and Decreased winter others, 2008 Creek, and glacial data after flows, increased Lake deposits restoration flows in spring and Tahoe early summer Basin Essaid and Hill, Sagehen Pyroclastic 850 Model Before and Decreased spring 2014 Creek, flows, glacial after flows, increased Sierra deposits erosion late summer flows. County Table 5: Physical characteristics of meadows monitored for summer groundwater balances, 2012 Meadow National Condition Bedrock Watershed Meadow Average Forest geology area area (ha) elevation (km2) (m) M14 Sierra Partially Glaciated 1.7 5.1 2,342 eroded granite M20 Sierra Partially Glaciated 0.5 1.4 2,662 eroded granite Round Stanislaus Eroded Glaciated 2.6 2 1,991 granite Wolfin Stanislaus Partially Weathered 0.2 3 1,554 eroded granite Faust Stanislaus Restored Metamorphic 0.4 2 1,646
Table 4: Previous studies of streamflow changes following restoration of Sierra Nevada meadows Reference Study area Bedrock geology Average annual precipitation (mm) Type of analysis Type of comparison Changes to streamflow following restoration/erosion Hammersmark and others, 2009 Bear Creek, Lassen County basalt 508 Model Before and after restoration Slight decrease in baseflow duration and volume within meadow, increase in baseflow volume downstream of meadow Ohara and others, 2013 Last Chance Creek, Plumas County granodiorite, pyroclastic flows,underlain by lacustrine clay 428 Model Before and after restoration Increased baseflow volumes Tague and others, 2008 Trout Creek, Lake Tahoe Basin Granodiorite and glacial deposits 500 to 1,000 streamflow data Before and after restoration Decreased winter flows, increased flows in spring and early summer Essaid and Hill, 2014 Sagehen Creek, Sierra County Pyroclastic flows, glacial deposits 850 Model Before and after erosion Decreased spring flows, increased late summer flows. Table 5: Physical characteristics of meadows monitored for summer groundwater balances, 2012 Meadow National Forest Condition Bedrock geology Watershed area (km2) Meadow area (ha) Average elevation (m) M14 Sierra Partially eroded Glaciated granite 1.7 5.1 2,342 M20 Sierra Partially eroded Glaciated granite 0.5 1.4 2,662 Round Stanislaus Eroded Glaciated granite 2.6 2 1,991 Wolfin Stanislaus Partially eroded Weathered granite 0.2 3 1,554 Faust Stanislaus Restored Metamorphic 0.4 2 1,646
54_Meadow_GW_Final_report_June_2015.docx