Samuel Vaugh - Academia.edu (original) (raw)

Papers by Samuel Vaugh

Journal of Water Resources Planning and Management, Sep 1, 1987

The probability distribution of storage in the Highland Lakes reservoir system on the Lower Color... more The probability distribution of storage in the Highland Lakes reservoir system on the Lower Colorado River in Central Texas is projected up to six years into the future. Projections are based on simulation using historical hydrologic data, initial storage conditions, expected water demands, and system operation policy. Results are compared with those obtained by application of Gould's probability matrix method, which assumes annually uncorrelated hydrologic data. Although serial correlation of combined annual inflows is not statistically significant, it is demonstrated that persistence in the annual data reduces the expected system storage under steady‐state conditions from 86.5% to 81.7% of the active storage capacity. Mechanisms are illustrated for evaluating the effect of reductions in contracted water supply on future reservoir storage levels.

Computer applications in water resources, 1985

Two methods are studied for determining the probability distribution of future levels of storage ... more Two methods are studied for determining the probability distribution of future levels of storage in a reservoir system: transient analysis and Gould's probability matrix method. In transient analysis, historical monthly inflow and net evaporation sequences of 1 to 5 years length are routed through the reservoir system with fixed initial storage, monthly demand pattern, and operating policy to determine the probability distribution of storage in annual time increments for each reservoir and for the total system. In Gould's method, the annual flows are assumed independent and the steady-state probability distribution of storage is found using the same hydrologic data, demand pattern, and operating policy. These procedures are applied to the six-reservoir Highland Lakes System on the Lower Colorado River, Texas. The time reliability of supply of the specified annual demand is evaluated as a function of initial storage.

Water Policy and Management: Solving the Problems, 1994

Computer applications in water resources, 1985

Two methods are studied for determining the probability distribution of future levels of storage ... more Two methods are studied for determining the probability distribution of future levels of storage in a reservoir system: transient analysis and Gould's probability matrix method. In transient analysis, historical monthly inflow and net evaporation sequences of 1 to 5 years length are routed through the reservoir system with fixed initial storage, monthly demand pattern, and operating policy to determine the probability distribution of storage in annual time increments for each reservoir and for the total system. In Gould's method, the annual flows are assumed independent and the steady-state probability distribution of storage is found using the same hydrologic data, demand pattern, and operating policy. These procedures are applied to the six-reservoir Highland Lakes System on the Lower Colorado River, Texas. The time reliability of supply of the specified annual demand is evaluated as a function of initial storage.

The Edwards Aquifer, a karst limestone formation, is the primary source of water supply for the C... more The Edwards Aquifer, a karst limestone formation, is the primary source of water supply for the City of San Antonio, Texas and many surrounding communities. Historically, two methods have been applied to calculate recharge to the Edwards Aquifer using a monthly water balance equation. The Edwards Aquifer Authority (EAA), in cooperation of HDR Engineering, Inc. has developed a new method for calculating recharge on a daily timestep using Hydrologic Simulation Program - FORTRAN (HSPF) Release 11, documented by the US. Geological Survey. Pilot recharge models of the Nueces and Blanco River Basins effectively simulate hydrologic and hydraulic processes of rainfall, interception, evaporation, infitration, evapo-transpiration, streamflow, and deep percolation using HSPF modules in order to quantify aquifer recharge. Simulated streamflows for a 40-year historical period are highly correlated with measured streamflows at proximate gage locations used to verify model calibration. Resulting e...

The results of this study indicate that the firm yield lost to the release requirements of the Te... more The results of this study indicate that the firm yield lost to the release requirements of the Texas Water Commission Interim Release Order can be recovered by diverting treated wastewater effluent and freshwater inflows to areas where their beneficial impact on the biological health of the Nueces Estuary can be maximized. Further study is needed to confirm the expected productivity enhancements from diversions into the Nueces Delta since they directly affect the firm yield recovery obtained in this reuse project. A pilot project to transfer 2.80 mgd of treated wastewater effluent and monitor enhanced productivity in the Nueces Delta is presently under design.

Http Dx Doi Org 10 1080 02626667 2014 892600, May 30, 2014

The accuracy of the Content should not be relied upon and should be independently verified with p... more The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.

Journal of Water Resources Planning and Management, 1987

Hydrological Sciences Journal, 2014

In 2007, the Texas legislature created a program to identify environmental flow standards statewi... more In 2007, the Texas legislature created a program to identify environmental flow standards statewide through the coordinated efforts of scientific and stakeholder groups and rulemaking by the Texas Commission on Environmental Quality. To aid in this task, a Hydrology-based Environmental Flow Regime (HEFR) method was developed that combines a suite of user-customizable hydrologic statistics with an implementation framework. Following the concepts of the Natural Flow Paradigm, the methodology includes the separation of a long-term hydrograph into key flow components (e.g. subsistence, base, high-flow pulse and overbank) defined by the Texas Instream Flow Program. Seasonal, annual and inter-annual flow component statistics were then coupled with biology, water quality and geomorphology overlays, where available, and with implementation rules applied to example large-scale water supply projects to support development of environmental flow standards for use in water rights permit conditions. The HEFR methodology and resulting flow recommendations are compared to two contemporary in-stream flow studies and adopted environmental flow standards. Subsistence flows were fairly similar. Baseflows were in a similar range, but fewer than three seasonal levels have sometimes been specified in in-stream flow studies. Episodic events are quite different in terms of magnitude, frequency, duration and applicable number. Downloaded by [Daniel Opdyke] at 11:48 22 April 2014 mais moins de trois niveaux saisonniers ont parfois été spécifiés dans les études de débits réservés. Les événements épisodiques sont très différents en termes d'ampleur, de fréquence, de durée et de nombre applicable.

Journal of Water Resources Planning and Management, Sep 1, 1987

The probability distribution of storage in the Highland Lakes reservoir system on the Lower Color... more The probability distribution of storage in the Highland Lakes reservoir system on the Lower Colorado River in Central Texas is projected up to six years into the future. Projections are based on simulation using historical hydrologic data, initial storage conditions, expected water demands, and system operation policy. Results are compared with those obtained by application of Gould's probability matrix method, which assumes annually uncorrelated hydrologic data. Although serial correlation of combined annual inflows is not statistically significant, it is demonstrated that persistence in the annual data reduces the expected system storage under steady‐state conditions from 86.5% to 81.7% of the active storage capacity. Mechanisms are illustrated for evaluating the effect of reductions in contracted water supply on future reservoir storage levels.

Computer applications in water resources, 1985

Two methods are studied for determining the probability distribution of future levels of storage ... more Two methods are studied for determining the probability distribution of future levels of storage in a reservoir system: transient analysis and Gould's probability matrix method. In transient analysis, historical monthly inflow and net evaporation sequences of 1 to 5 years length are routed through the reservoir system with fixed initial storage, monthly demand pattern, and operating policy to determine the probability distribution of storage in annual time increments for each reservoir and for the total system. In Gould's method, the annual flows are assumed independent and the steady-state probability distribution of storage is found using the same hydrologic data, demand pattern, and operating policy. These procedures are applied to the six-reservoir Highland Lakes System on the Lower Colorado River, Texas. The time reliability of supply of the specified annual demand is evaluated as a function of initial storage.

Water Policy and Management: Solving the Problems, 1994

Computer applications in water resources, 1985

Two methods are studied for determining the probability distribution of future levels of storage ... more Two methods are studied for determining the probability distribution of future levels of storage in a reservoir system: transient analysis and Gould's probability matrix method. In transient analysis, historical monthly inflow and net evaporation sequences of 1 to 5 years length are routed through the reservoir system with fixed initial storage, monthly demand pattern, and operating policy to determine the probability distribution of storage in annual time increments for each reservoir and for the total system. In Gould's method, the annual flows are assumed independent and the steady-state probability distribution of storage is found using the same hydrologic data, demand pattern, and operating policy. These procedures are applied to the six-reservoir Highland Lakes System on the Lower Colorado River, Texas. The time reliability of supply of the specified annual demand is evaluated as a function of initial storage.

The Edwards Aquifer, a karst limestone formation, is the primary source of water supply for the C... more The Edwards Aquifer, a karst limestone formation, is the primary source of water supply for the City of San Antonio, Texas and many surrounding communities. Historically, two methods have been applied to calculate recharge to the Edwards Aquifer using a monthly water balance equation. The Edwards Aquifer Authority (EAA), in cooperation of HDR Engineering, Inc. has developed a new method for calculating recharge on a daily timestep using Hydrologic Simulation Program - FORTRAN (HSPF) Release 11, documented by the US. Geological Survey. Pilot recharge models of the Nueces and Blanco River Basins effectively simulate hydrologic and hydraulic processes of rainfall, interception, evaporation, infitration, evapo-transpiration, streamflow, and deep percolation using HSPF modules in order to quantify aquifer recharge. Simulated streamflows for a 40-year historical period are highly correlated with measured streamflows at proximate gage locations used to verify model calibration. Resulting e...

The results of this study indicate that the firm yield lost to the release requirements of the Te... more The results of this study indicate that the firm yield lost to the release requirements of the Texas Water Commission Interim Release Order can be recovered by diverting treated wastewater effluent and freshwater inflows to areas where their beneficial impact on the biological health of the Nueces Estuary can be maximized. Further study is needed to confirm the expected productivity enhancements from diversions into the Nueces Delta since they directly affect the firm yield recovery obtained in this reuse project. A pilot project to transfer 2.80 mgd of treated wastewater effluent and monitor enhanced productivity in the Nueces Delta is presently under design.

Http Dx Doi Org 10 1080 02626667 2014 892600, May 30, 2014

The accuracy of the Content should not be relied upon and should be independently verified with p... more The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.

Journal of Water Resources Planning and Management, 1987

Hydrological Sciences Journal, 2014

In 2007, the Texas legislature created a program to identify environmental flow standards statewi... more In 2007, the Texas legislature created a program to identify environmental flow standards statewide through the coordinated efforts of scientific and stakeholder groups and rulemaking by the Texas Commission on Environmental Quality. To aid in this task, a Hydrology-based Environmental Flow Regime (HEFR) method was developed that combines a suite of user-customizable hydrologic statistics with an implementation framework. Following the concepts of the Natural Flow Paradigm, the methodology includes the separation of a long-term hydrograph into key flow components (e.g. subsistence, base, high-flow pulse and overbank) defined by the Texas Instream Flow Program. Seasonal, annual and inter-annual flow component statistics were then coupled with biology, water quality and geomorphology overlays, where available, and with implementation rules applied to example large-scale water supply projects to support development of environmental flow standards for use in water rights permit conditions. The HEFR methodology and resulting flow recommendations are compared to two contemporary in-stream flow studies and adopted environmental flow standards. Subsistence flows were fairly similar. Baseflows were in a similar range, but fewer than three seasonal levels have sometimes been specified in in-stream flow studies. Episodic events are quite different in terms of magnitude, frequency, duration and applicable number. Downloaded by [Daniel Opdyke] at 11:48 22 April 2014 mais moins de trois niveaux saisonniers ont parfois été spécifiés dans les études de débits réservés. Les événements épisodiques sont très différents en termes d'ampleur, de fréquence, de durée et de nombre applicable.