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<br /> <br />stream flow. These responses to stream flow by different user groups <br />are the criteria which are basic to the methods introduced here. <br /> <br />The first method is called the single cross section approach. This <br />method is useful primarily for identifying flows below which a recrea- <br />tion activity is not feasible and results in a so called "minimum" flow <br />recommendation. <br /> <br />:.; .::~;i.:;:': <br /> <br />t <br /> <br />.. <br /> <br />The second method is called the incremental method. With thi s <br />method the recreation planner is able to analyze vari ous fl ows and <br />determine the recreation potential of a stream at different flows. <br /> <br />This paper is being distributed with four objectives in mind. <br />These are: <br /> <br />-. <br /> <br />1. To bring the problem of preserving instream flows to the <br />attent i on of recreat i onagenci es and the research community in <br />order to encourage more research in this vital and neglected <br />area. <br /> <br />2. To discuss the development of the recreation probability-of- <br />use curves and of recreation cri teri a in general, whi ch are <br />necessary for quantifying instream water requirements for <br />recreation. <br /> <br />3. To obtain review and comment on the recreation criteria and <br />probability-of-use curves, and to request data which may be <br />used to test or improve the criteria or curves. <br /> <br />4. To describe the two approaches for assessing stream flows and <br />discuss how various recreation planning processes can be <br />served by their application. <br /> <br />Both methods of instream flow analysis discussed in this paper <br />utilize computer modeling techniques. Both approaches also require that <br />streamflow data be collected. The single cross section approach, as its <br />name implies, requires that information be collected at only one loca- <br />tion on the stream. The incremental method requires that data be co1- <br />, 1ected at multiple locations on the stream. In addition to cross <br />sectional data, data relating the streamflow parameters to recreation <br />potential are necessary. These data are termed recreation criteria. <br /> <br />Recreation criteria for instream flow methodologies are the rec- <br />reation activity information bases necessary to describe a relationship <br />between the quantity of water flowing in a stream, and the quantity and <br /> <br />2 <br />