By the single-bounded dichotomous choice questionnaire method, the economic value were NT$ 1,749.34 and NT$ 560.54 for inside and outside residents, respectively;

• 以单界二元选择法评估，得知兰阳溪上游集水区对区内居民而言，每人每年有1；749.；34元的经济价值，对区外居民则有每人每年560