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<br />001649 <br /> <br />activities ~nd all other ways (taken collectively) in which <br /> <br />individuals may elect to use their time, energy, and incomes. <br /> <br />This involves shifts to or from distant substitutes. <br /> <br />In making these estimates, the model incorporates responses to the <br /> <br />three variables which partially determine recreatianists' satisfaction, <br /> <br />and which are potentially affected by hydrologic change. As previously <br /> <br />stated, these three variables are streamflow level, crowding, and travel <br /> <br />distance. The functional relationships are as follows: <br /> <br />1) Streamflow level influences the satisfaction which is provided <br /> <br />by the recreational experience and, in turn, the participation <br /> <br />rate as shown in Figure 1. For the typical activity, satis- <br /> <br />faction and, thus, rate of participation (curve PRF) increase <br /> <br />with increasing flow level up to the optimal flow level, f, <br /> <br />for that activity and stream class. At this point, partici- <br /> <br />patlon is at its maximum rate, r. Beyond that point, the <br /> <br />participation will decline with increasing flow level. <br /> <br />Figure 1 <br />Streamflow Response Function <br /> <br />MEAN <br />PARTICIPATION r <br />RATE <br /> <br /> <br />PRF <br /> <br />f <br /> <br />STREAMFLOW lEvE~ <br /> <br />2) Density of recreational use (crowding) also influences the <br /> <br />5 <br />