Roaring Fork Stream Flow Survey - Laserfiche WebLink

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2. Extreme low flows 3. High flow pulses 4. Small floods Frequency of extreme low flows during each water year or season Mean or median values of extreme low flow event: • Duration (days) • Peak flow (minimum flow during event) • Timing (Julian date of peak flow) feeding and spawnng areas • Support hyporheic organisms (living in saturated sediments) • Enable recruitment of certain floodplain plant species • Purge invasive, introduced species from aquatic and riparian commuiuties • Concentrate prey into limited areas to benefit predators Szabtotal=~ patanaeters Frequency of high flow pulses during each water year or season Mean or median values of high flow pulse event: • Duration (days) • Peak flow (maximum flow during event) • Timing (Julian date of peals flow) • Rise and fall rates Sisbtotal 6 pcnan~eters Frequency of small floods during each water year or season Mean or median values of small flood event: • Duration (days) • Peak flow (maximum flow during event) • Timing (Julian date of peak • Shape physical character of river channel, including pools, riffles • Determine size of streambed substrates (sand, gravel, cobble) • Prevent riparian vegetation from encroaching into channel • Restore normal water quality conditions after prolonged low flows, flushing away waste products and pollutants • Aerate eggs in spawning gravels, prevent siltation • Maintain suitable salinity conditions in estuaries Applies to small and large floods: • Provide migration and spawning cues for fish • Trigger new phase in life cycle (i.e. insects) • Enable fish to spawn in floodplain, provide 55