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<br />001351 <br /> <br />3) Travel distance from home to the recreational site affects the <br /> <br />time and money costs of participation in the recreational ac- <br /> <br />tivity and, thus, influences the participation rate, as shown <br /> <br />in Figure 3. Participation rate declines with increasing <br /> <br />travel distance. For any particular distance from home to re- <br /> <br />creation site, d, the participation rate, r, can be read from <br /> <br />curve PRD. <br /> <br />Figure 3 <br />Distance Decay Function <br /> <br />r <br /> <br /> <br />PRO <br /> <br />MEAN <br />PAR TIC I PA TION <br />RATE <br /> <br />d <br /> <br />TRAVEL DISTANCE <br /> <br />Data Requirements <br /> <br />COWRISM may be thought of, in a strictly formal sense, as one of a <br /> <br />class of constrained optimization models with potential application to <br /> <br />a wide variety of problems, going far beyond those associated with stream- <br /> <br />flow regulation and water-based recreational activities. However, the <br /> <br />data required to use the model are obviously specific to the particular <br /> <br />problem to be solved. In this case, we wish to confine our attention <br /> <br />strictly to water-based recreational activity allocation (constrained by <br /> <br />available streamflow) as has been described. For this application, the <br /> <br />following data are required: <br /> <br />7 <br />