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34 1. All three streams were of the same relative size. 2. Crew efficiency was constant on all three streams. 3. The three streams required approximately the same amount of field collection time. 4. The three streams chosen to assess the impact of non-data collection time costs (travel time and per diem) re- present streams with the lowest, moderate, and highest non-data collection time costs of the study streams, respectively. The data presented in Tables 18 and 19 show that travel time and per diem costs made up most of the cost for carry- ing out an instream flow evaluation. Specifically, on the Williams Fork River, $226 was the actual data collection cost, while $1,146 is the cost for travel time and per diem to collect data for an IFG4 evaluation. The fixed travel and per diem costs are more than five times the cost of the field data collection process. Similarly, on the South Fork of the Rio Grande River, the data collection cost was $146 while the travel and per diem costs were $687 which is a ratio of 1:4.5. Only on the Lake Fork of the Gunnison River did data collection costs approximate the travel and per diem costs, being $193 and $156, respectively. Table 18. Travel time costs, cross section time costs, and total . costs per visit for three similar rivers.a X-Sec- Travel tion Per Visit time time diem Total Stream no. cost cost cost cost Lake Fork Gunnison 1 $ 52 $105 $ 157 Lake Fork Gunnison 2 52 44 96 Lake Fork Gunnison 3 52 44 96 Total $156 $193 $ 349 South Fork Rio Grande 1 $139 $ 70 $ 90 $ 299 South Fork Rio Grande 2 139 41 90 270 South Fork Rio Grande 3 139 35 90 264 Total $417 $146 $270 $ 833 Williams Fork 1 $232 $ 81 $180 $ 494 Williams Fork 2 232 75 180 488 Williams Fork 3 232 69 90 392 Total $696 $225 $450 $1,374 a $30.00 Hourly wage is $5.81 and average cost for per diem was per day.