Evaluation of Methods Used for Estimating Selected Streamflow Statistics, and Flood Frequency and Magnitude, for Small Basins in North Coastal California

Mann, Michael P.; Rizzardo, Jule; Satkowski, Richard

doi:10.3133/sir20045068

Cited by 5 publications

(7 citation statements)

References 6 publications

(2 reference statements)

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“…Mann et al. () compute a median percentage difference of −13.2% between the measured and estimated mean daily average discharge among 40 small USGS‐gauged North Coastal California drainages, and a −28% difference between mid‐December and March 31. Saraeva and Hardy () found similar magnitudes of error.…”

Section: Modified Percent Of Flow Approachsupporting

confidence: 84%

“…Elder Creek À20.1%; and South Fork Eel at Branscomb 3.1% (Figure 6). These errors fall within or below the range reported by Mann et al (2004). The shape of the Bull Creek and Elder Creek estimated baselines was similar to the empirical site-specific curves ( Figure 6) Promising work has been undertaken to improve estimates at ungauged basins using process-based modelling (Dralle, Karst, & Thompson, 2016;M€ uller et al, 2014).…”

Section: Percent Of the Streamflow Baselinesupporting

confidence: 66%

“…Mean annual flow (MAF) is a common hydrological statistic, and is required to apply this regional approach at an ungauged POD. This approach currently employs the formula recommended by the California State Water Resources Control Board (Mann, Rizzardo, & Satkowski, ), though other methods are available. It incorporates a drainage basin area‐ratio for statistical transfer, as well as a precipitation ratio to account for differences in precipitation between basins:

{MAF}_{normalPOD} = {MAF}_{normalGauge} * false({DA}_{POD} false/ {DA}_{Gauge} false) * false(P_{POD} false/ P_{Gauge} false)

…”

Section: Modified Percent Of Flow Approachmentioning

confidence: 99%

“…A regionalised instream flow method requires a practical methodology for estimating streamflows in ungauged drainages. But as Müller and Thompson () note, streamflow estimation “remains both a fundamental necessity for water managers and a major research challenge (Blöschl, Sivapalan, Wagener, Viglione, & Savenije, ; Montanari et al., ).” For this illustration, we chose a simple but commonly used approach recommended by the California State Water Resources Control Board (SWRCB) (Mann et al., ). This regionalised methodology scales reference gauged streamflows, typically from USGS gauges, to ungauged locations relying on two independent variables: drainage area and mean annual precipitation (see Chalise, Kansakar, Rees, Croker, & Zaidman, ; Castellarin et al., cited in Müller & Thompson, for other examples).…”

Section: Modified Percent Of Flow Approachmentioning

confidence: 99%

“…These errors fall within or below the range reported by Mann et al. (). The shape of the Bull Creek and Elder Creek estimated baselines was similar to the empirical site‐specific curves (Figure ); however, the South Fork Eel Branscomb estimated baseline was skewed (specifically between January and March).…”

Section: Modified Percent Of Flow Approachmentioning

confidence: 99%

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Managing diversions in unregulated streams using a modified percent‐of‐flow approach

et al. 2017

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Abstract1. In Mediterranean-type river systems, naturally low seasonal stream flows are often overexploited, which has implications for managing flows for environmental as well as human needs.2. Traditional approaches to instream flow management are not well suited to unregulated systems with strong seasonal patterns of water availability and many water diverters, and are challenging to implement in such systems. They often do not protect the full range of variability in the annual hydrograph, require extensive site-specific data, expensive modelling or both.3. In contrast, holistic flow management strategies, such as percent-of-flow (POF) strategies are designed to protect multiple ecological processes and preserve inter-annual flow variability. However, POF approaches typically require real-time streamflow gauging, and often lack a robust metric relating a diversion rate to ecological processes in the stream. 4.To address these challenges, we present a modified percent-of-flow (MPOF) diversion approach where diversions are allocated from a streamflow baseline which is derived from a regional relationship between a conservative streamflow-exceedance and date. The streamflow baseline remains the same from year to year, and is independent of water-year type. This approach protects inter-annual flow variability and provides a predictable daily allowable volume of diversion at any diversion point-supporting efficient water management planning. 5.The allowable diversion rate in the MPOF approach is based not on a fixed percentage of the ambient streamflow, but rather on a maximum allowable percentage change in riffle crest thalweg depth, an ecologically meaningful, common hydraulic measurement.6. In this paper, we demonstrate that the MPOF approach is a holistic approach well suited to manage diversions in unregulated streams typical of California's Mediterranean-type coastal drainages. K E Y W O R D Senvironmental flows, hydroecology, instream flows, Mediterranean rivers, water diversionThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Modified Percent Of Flow Approachsupporting

confidence: 84%

Section: Percent Of the Streamflow Baselinesupporting

confidence: 66%

{MAF}_{normalPOD} = {MAF}_{normalGauge} * false({DA}_{POD} false/ {DA}_{Gauge} false) * false(P_{POD} false/ P_{Gauge} false)

…”

Section: Modified Percent Of Flow Approachmentioning

confidence: 99%

Section: Modified Percent Of Flow Approachmentioning

confidence: 99%

Section: Modified Percent Of Flow Approachmentioning

confidence: 99%

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Managing diversions in unregulated streams using a modified percent‐of‐flow approach

et al. 2017

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Migration in drought: Receding streams contract the seaward migration window of endangered salmon

et al. 2022

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Prolonged migration windows buffer migratory animal populations against uncertainty in resource availability. Understanding how intensifying droughts from climate change influence the migration window is critical for biodiversity conservation in a warming world. We explored how drought affects the seaward migration of endangered coho salmon (Oncorhynchus kisutch) near the southern extent of their range in California, USA. We tracked stream departures of juvenile coho, measuring streamflow and temperature in seven streams over 13 years, spanning a historic drought with extreme dry and warm conditions. Linear mixed effects models indicate that, over the range of observations, a decrease in seasonal streamflow (from 4.5 to 0.5 mm/day seasonal runoff) contracted the migration window by 31% (from 11 to 7 weeks). An increase from 10.2 to 12.8°C in mean seasonal water temperature hastened the migration window by three weeks. Pacific salmon have evolved to synchronize ocean arrival with productive ocean upwelling. However, earlier and shorter migration windows during drought could lead to mismatches, decreasing fitness and population stability. Our study demonstrates that drought‐induced low flows and warming threaten coho salmon in California and suggests that environmental flow protections will be needed to support the seaward migration of Pacific salmon in a changing climate.

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Cumulative Effects of Small Reservoirs on Streamflow in Northern Coastal California Catchments

Deitch

Merenlender

Feirer³

2013

Water Resour Manage

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Evaluation of Methods Used for Estimating Selected Streamflow Statistics, and Flood Frequency and Magnitude, for Small Basins in North Coastal California

Cited by 5 publications

References 6 publications

Managing diversions in unregulated streams using a modified percent‐of‐flow approach

Managing diversions in unregulated streams using a modified percent‐of‐flow approach

Migration in drought: Receding streams contract the seaward migration window of endangered salmon

Cumulative Effects of Small Reservoirs on Streamflow in Northern Coastal California Catchments

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