Analysis of methods to determine storage capacity of, and sedimentation in, Loch Lomond Reservoir, Santa Cruz County, California, 2009

McPherson, Kelly R.; Freeman, L.A.; Flint, Lorraine E.

doi:10.3133/sir20115141

Cited by 8 publications

(11 citation statements)

References 3 publications

(16 reference statements)

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“…Based on aforementioned findings, the study suggests that bathymetric studies need not only to be more related to fundamental science of hydrology (as was the case in most reviewed studies (Richard et al, 2000;Smith and Sandwell, 2004;McPherson et al, 2009;El-Hassan, 2015;Ajith, 2016;Chomba and Sichingabula, 2016) but must also be linked to social hydrology, which ventures into understanding pressing societal problems such as water security. Effective management and planning for water in the reservoir needs not only to be more related to fundamental and technical scientific issues which are just understood by water scientists, but also to the solving of pressing societal problems related to unstable bathymetries and, eventually, poor water supply such as those in the Makoye reservoir catchment.…”

Section: Synthesis Of the Study Findingsmentioning

confidence: 90%

Bathymetry of the Makoye Reservoir and its Implications on Water Security for Livestock within the Catchment

Muchanga

Sichingabula

Obando

et al. 2019

International Journal of Geography and Geology

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Article History Keywords Bathymetry Evaporation GIS Hydrological regimes Livestock Monze District-Zambia Reservoir Sedimentation Water.The objectives of the study were to: determine bathymetry of the reservoir; understand seasonal hydrological regimes of the reservoir; determine factors influencing reservoir bathymetry and, examine the implications of the reservoir's bathymetry on livestock water demand and policy decision making. The determined reservoir bathymetries and capacities at low, medium and full levels confirmed drastic changes in water volumes and eventually, a threat to water security for livestock. This unsteady equilibrium in reservoir's bathymetry and water volumes was mainly due to high mean annual siltation rates (>5,000 tyr -1 ). Using 3D spatial analysts tools in ArcGIS 10.3 and spreadsheet Microsoft Excel to analyze the data based on the study, hypsometric curves showed strong non-linear relationships among water depth and water surface; water depths and water volume, as well as water surface area and water volume. Generally, through inter-seasonal comparisons of reservoir's bathymetries and water volumes between 2015 and 2017, this study illustrates the significance of bathymetric study of small reservoirs as a plinth to provide policy context and guidelines on water resource management for livestock, as a missing component in general studies of bathymetry, which are usually predominated by understanding the physical processes, but with little or no emphasis on their meaning towards addressing societal needs. Hence, a community engaged strategy to addressing upstream sediment-generating activities would help in stabilizing the bathymetry of the reservoir and eventually enhance water security for livestock. Contribution/Originality:This study is one of very few studies which have investigated implications of bathymetric surveying on sustainable water resource management for livestock. The study documents how bathymetric surveying can be used to understand seasonal hydrological regimes and storage capacity loss of small reservoirs so as to prepare for water security.

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Section: Synthesis Of the Study Findingsmentioning

confidence: 90%

Bathymetry of the Makoye Reservoir and its Implications on Water Security for Livestock within the Catchment

Muchanga

Sichingabula

Obando

et al. 2019

International Journal of Geography and Geology

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“…For 2017, the year with the highest sediment yield in the recent measurements at the Santa Cruz streamgage, the sediment yield was 1,440 t/yr/km 2 , which equates to 24 acre-feet of storage loss. For the period from 2009 to 2017, for which there are 6 years of available sediment yield data (2009, 2010, 2014Conaway and others, 2013;East and others, 2018), application of equation 2 results in a total storage loss of 29 acre-feet, or about 5 acre-feet per year. These estimated storage losses reinforce the difficulty of detecting decadal-scale storage changes from repeat surveys: the decadal-scale changes can be similar in magnitude to survey uncertainty (86 acre-feet for 2009 survey and 49 acre-feet for 2019 survey).…”

Section: Appendix 1 Bowman and Williams 2012 Memo To The City Of Santa Cruzmentioning

confidence: 99%

Storage capacity and sedimentation characteristics of Loch Lomond Reservoir, California, 2019

Whealdon-Haught¹,

Wright²,

Marineau³

2021

Scientific Investigations Report

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“…Information on the accuracy of reservoir storage change was not available. However, given the accuracies of basic hydrologic and geomorphic parameters, reservoir storage change can be estimated with relatively high confidence (e.g., McPherson et al 2011).…”

Section: Storagementioning

confidence: 99%

Water Budgets for the Delta Watershed: Putting Together the Many Disparate Pieces

Ariyama¹,

Boisramé²,

Brand³

2019

SFEWS

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Water budgets integrate and summarize the water inputs and outputs that are essential for effective water resources management. Using water data collected from different sources, we constructed three water budgets (a 12-year annual average, a wet year, and a critically dry year) for the Sacramento-San Joaquin Delta (Delta), the Sacramento River (SR) watershed, and the San Joaquin River (SJR) watershed. Although multiple water budgets for the Delta exist, the water budgets presented here are the first to provide all three of the following: (1) water budgets for the entire Delta watershed, divided into management-relevant components, (2) comparisons between wet and dry years and between different regions of the watershed, and (3) discussion of major gaps and uncertainties in the available water data to guide and inform future data collection and water management. Results show that, from 1998 to 2009, the Delta received 24.2 million acre feet (maf) of water each year on average, which primarily exited the Delta as river outflow (71%), water exports (22%), and evapotranspiration (ET; 6%). The SR watershed received 56.9 maf of water (95% as precipitation). The major outputs from the SR watershed were ET (63%) and flows to the Delta (34%). In the SJR watershed, total water input was 28.7 maf composed of precipitation (74%), water imported from the Delta (18%), and storage depletion (7%). The major outputs from the SJR watershed were ET (65%), water exports (19%), and flows to the Delta (14%). Most values varied greatly from year to year. Although streamflows, water exports, and valley precipitation are relatively well measured and estimated, uncertainties are higher for groundwater storage change as well as for ET and precipitation in montane regions. Improvement in data collection and synthesis in these components is necessary to build a more detailed and accurate water budget.

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Analysis of methods to determine storage capacity of, and sedimentation in, Loch Lomond Reservoir, Santa Cruz County, California, 2009

Cited by 8 publications

References 3 publications

Bathymetry of the Makoye Reservoir and its Implications on Water Security for Livestock within the Catchment

Bathymetry of the Makoye Reservoir and its Implications on Water Security for Livestock within the Catchment

Storage capacity and sedimentation characteristics of Loch Lomond Reservoir, California, 2019

Water Budgets for the Delta Watershed: Putting Together the Many Disparate Pieces

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