2013-04-10_PERMIT FILE - C2010089

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domestic use and pond evaporation/CU credits based on average precipitation and temperatures, the average monthly dust suppression amounts were used in this report. Depletions from dust suppression are summarized in Table 9 and are shown as follows: Water for dust suppression is an instantaneous impact to the stream and does not have an associated delayed impact. POND EVAPORATION Water surface evaporation occurs at each pond (except during the winter months), even though there may be no instantaneous pumping or release from the pond. If storage in the pond occurs in priority, the evaporative depletions come out of such in- priority storage and no release is required. If the evaporation is being replaced by inflow into the pond, and a call comes from a downstream water right, then a release of water in the amount of such evaporation is required. Although there has never been a call from surface rights on Calamity, Tuttle, or Coal Canyon Draws, or on the San Miguel River below Calamity Draw, the current augmentation plan has considered the possibility of an irrigation season call for determining the monthly augmentation amounts that may be needed locally. The evaporation depletions shown in the 1988 Report are less than the revised amounts calculated in this report. When calculating pond evaporation, an effective precipitation contribution can be used for (i) ponds that are on a year -round live stream, and (ii) for gravel pits. If the pond is on a stream that is dry most of the time, there is no credit given. Tables 10 and 11 show the calculations of the evaporation based on 43 inches per year for the Nucla area, and monthly distribution according to DWR standards. Average Irrigation Season Average Non -Irr Season Total Month Unit ac -ft ac -ft ac -ft January 0.86 0.86 February 1.03 1.03 March 2.67 2.67 April 3.65 3.65 May 5.12 5.12 June 6.32 6.32 July 5.50 5.50 August 4.68 4.68 September 2.85 2.85 October 3.24 3.24 November 1.84 1.84 December 0.68 0.68 Total 31.36 7.08 38.44 Water for dust suppression is an instantaneous impact to the stream and does not have an associated delayed impact. POND EVAPORATION Water surface evaporation occurs at each pond (except during the winter months), even though there may be no instantaneous pumping or release from the pond. If storage in the pond occurs in priority, the evaporative depletions come out of such in- priority storage and no release is required. If the evaporation is being replaced by inflow into the pond, and a call comes from a downstream water right, then a release of water in the amount of such evaporation is required. Although there has never been a call from surface rights on Calamity, Tuttle, or Coal Canyon Draws, or on the San Miguel River below Calamity Draw, the current augmentation plan has considered the possibility of an irrigation season call for determining the monthly augmentation amounts that may be needed locally. The evaporation depletions shown in the 1988 Report are less than the revised amounts calculated in this report. When calculating pond evaporation, an effective precipitation contribution can be used for (i) ponds that are on a year -round live stream, and (ii) for gravel pits. If the pond is on a stream that is dry most of the time, there is no credit given. Tables 10 and 11 show the calculations of the evaporation based on 43 inches per year for the Nucla area, and monthly distribution according to DWR standards.