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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />003\238 <br /> <br />together' with expansion by enlargement and extension of existing canals, <br />the clearing of land under canals, and the reuse of return flow water <br /> <br />would increase irrigation by 4,000 acres. <br /> <br />Table VII presents a summary of the estimated present and potential <br />stream depletion of the Upper San Juan River' Division. <br /> <br />TABLE VII <br /> <br />Present average annual stream depletion............... 7,800 Acre Feet <br /> <br />Potential annual stream depletion by <br /> <br />4,200 Acre Feet <br /> <br />irrigation..................................... ........ <br />Potential annual stream depletion by <br />reservoir evaporation............ <br />Potential annual stream depletion by <br />ml.Ulicipal use........................................ <br /> <br />1,200 <br /> <br />II <br /> <br />" <br /> <br />200 <br /> <br />II <br /> <br />II <br /> <br />Sub-total <br /> <br />5,600 Acre Feet 5,600 <br />13,400 Acre Feet <br /> <br />" <br /> <br />" <br /> <br />Total <br /> <br />Field reconnaissance study of a canal for the diversion of water <br /> <br />from the East Fork of the San Juan River for the irrigation of land of <br /> <br />the Mill Creek and Echo Creek was conducted. Such a canal would provide <br /> <br />irrigation for an additional 1500 to 2000 acres, a part of which presently <br /> <br />receives a partial supply of water. <br /> <br />It was concluded that with the West Fork-Fourmile Creek Canal diver- <br /> <br />ting a large portion of the unused summer natural flow of the river above <br /> <br />the junction of the East Fork, the construction of the canal from the <br /> <br />East Fork could not be justified without also providing reservoir storage <br /> <br />on the river above the junction. Stream depletion figures as reported <br /> <br />above provide no allowance for the irrigation of the land potentially <br />serviceable by the East Fork Canal. <br /> <br />-12- <br />