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WSP05034
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Last modified
1/26/2010 2:16:40 PM
Creation date
10/12/2006 12:48:09 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8273.100
Description
Colorado River Basin Salinity Control - Federal Agencies - Bureau of Reclamation
Basin
Colorado Mainstem
Water Division
5
Date
7/1/1987
Author
BOR
Title
Monitoring and Evaluation of Salinity Control Projects - Interim Guide for the Colorado River Basin Salinity Control Program
Water Supply Pro - Doc Type
Report/Study
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<br />8l.60 <br /> <br />I <br />I <br /> <br />3. Project impacts can be displayed as year-ta'year <br />changes in accomplishment and cost within the context .of <br />marginal accomplishment and cast. <br /> <br />Direct change in net farm income shauld be estimated far <br />the participating and nanparticipating farms. The change <br />in net farm income .of the participating farms shauld be cal- <br />culated by econamic analysis fram a sample .of the papula- <br />tian and extrapalated ta all the participating farms. Data <br />ta measure the change in participant net farm income <br />shauld be collected during planning and fallaw-up as a <br />part .of the onfarm planning pracess and coordinated with <br />irrigatian manitaring .of the sample farms, As apprapriate, <br />farms will be stratified inta size categaries, sails will be <br />grauped into categories based an physical characteristics, <br />and existing irrigatian systems will be classified by type, <br />Randam seleCtian .of nanparticipants ta be surveyed <br />shauld be made from the tatal papulatian .of nanpar- <br />ticipants. Survey data shauld permit cIassificatian .of non- <br />participants by strata definitian, <br /> <br />are considerably easier ta acquire, the maximum sample <br />numbers are nat sa critical, <br /> <br />Determining an apprapriate sample size requires a com- <br />pramise between desire far an acceptable degree .of statisti- <br />cal reliability, the high cost .of data collectian, and the nar- <br />ma! need ta supply technical assistance in whale staff year <br />increments, Far an .optimum econamic study, it shauld be <br />nated that given 3 farm sizes, 3 soil graupings, 3 irrigatian <br />types, about 15 eligible practices, and innumerable com- <br />binatians .of preapplicatian practices, a sample matrix .of at <br />least 6,000 cells wauld be the minimum size needed ta .ob- <br />tain infarmatian an all data combinatians. Since this may <br />be larger than the tatal number .of farm participants, it <br />must be nated that sample size cannat always be deter- <br />mined by the need far reliable data an incremental impact <br />.of individual practices. Passible sampling rates wauld then <br />be weighed against the need far statistical reliability in <br />determining fmal sample sizes. The S3n!ple .of <br />nonparticipants should be planned ta be accomplished <br />using the OMB appraved farm No. 40-33807, Irrigatian <br />Questiannaire, This sample wauld be stratified in the <br />same way as the case-study sample, but since these data <br /> <br />The average value .of sampled parameters and a calculated <br />confidence interval shauld be expressed far each <br />parameter in each cell in the stratificatian .of the popula- <br />tian, Hawever, in initial years .of the manitaring and <br />evaluatian effart, total sample size will be relatively small <br />and require aggregatian .of variables ta permit meaningful <br />expressian .of confidence intervals about calculated <br />averages. Where possible, the equality .of parameter <br />values between or within nanparticipating and participat. <br />ing graups shauld be tested statistically. As samplesiz~ <br />and statistical degrees .of freedam become larger, meanmg- <br />fultesting will be possible in a greater praportion of strata, <br /> <br />Case-file analysis .of participating farms shauld pravide in- <br />sight inta the marginal econamic and salinity reductian. <br />contributian .of practices in given resaurce and econalUlc <br />settings. It is not expected that a sufficient number .of ab- <br />servatians will be made an applicatians .of anfarm prac- <br />tices having similar pretreatment and resaurce conditions <br />ta permit meaningful statements, .of statistical reliability. <br />Hawever, case-me analysis will serve as a planning and <br />decisianmaking aid when similar resaurce conditians are <br />encountered by identifying the kind and amaunt of ex- <br />pected productian inputs and .outputs, <br /> <br />Costs tabe weighed against direct anfarm income, employ- <br />ment, and salinity changes include public C?ntributi?ns ta <br />installatian .of conservatian warks and public and prIvate <br />expenditures far administering the program. Private costs <br />far installing conservation warks, aperatian and main- <br />tenanCe and associated changes in production inputs will <br />be acco:mt~ far in the calculatian .of changed net farm <br />income. <br /> <br />The results of anfarm manitoring and evaluatian will begin <br />ta accrue thraughout the implementatian periad, In the <br />early years, results shauld, be aggregated from few sources <br />and will encompass shart-time periods with a likelihood .of <br /> <br />22 <br /> <br />23 <br />
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