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2009-12-18_REVISION - C1981008 (4)
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2009-12-18_REVISION - C1981008 (4)
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Entry Properties
Last modified
8/24/2016 3:57:56 PM
Creation date
12/22/2009 1:44:40 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
REVISION
Doc Date
12/18/2009
Doc Name
Response Letter
From
NRCS
To
DRMS
Type & Sequence
PR6
Email Name
MLT
Media Type
D
Archive
No
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<br />United States Department of Agriculture <br />. MRCS <br />Natural Resources Conservation Service <br />Jim Boyd, Resource conservationist <br />P. O. Box 29 <br />Norwood, CO 51423 <br />March 21, 2008 <br />Division of Reclamation, Mining and Safety <br />Department of Natural Resources - Coal Program <br />701 Carmino del Rio, Room 315 <br />Durango, CO 81301 <br />jim.boyd@co.usda.gov <br />970-327-4245-OFFICE <br />970-327-4247-FAX <br />RE: Post Mine Vegetation on Prime Farmland. New Horizon Mine, Permit C-81-008 <br />Dear Concerned Parties: <br />v <br />Mr. Gubka, mine engineer for New Horizons Mine in Nucla, Colorado, recently submitted to me <br />data on the amount of irrigation water that the Colorado Cooperative Ditch Company (CC-Ditch) <br />has historically delivered to the Nucla Park. In his analysis of the data he states that: <br />"insufficient water quantity is being transported by the CC-Ditch to the Park to make 50 shares <br />of water equivalent to 1.5 CFS, the amount to satisfy the requirements of three sideroll <br />sprinklers." I will herein counter that this is generally not a relevant concern, nor a completely <br />accurate statement, given the following information. <br />In my previous letter, dated March 4, 2008, I explained design criteria for three sideroll <br />sprinklers serving about 70 acres of irrigated alfalfa, with each sideroll utilizing 0.5 cubic feet <br />per second (cfs) and covering 23 acres. I included in that discussion an irrigation schedule <br />demonstrating that the peak irrigation demands of alfalfa could be satisfied with three siderolls <br />operating simultaneously thirteen (13) out of every fifteen (15) days. This sideroll sprinkler <br />system is conservatively designed to meet the extreme growing conditions of high temperatures, <br />or the peak consumptive water use of the crop. This period typically occurs in the months of <br />June and July, at which time the CC-Ditch is generally able to provide the water quantities <br />needed (see attached spreadsheet). At other times of the growing season, the alfalfa crop needs <br />significantly less water, which can also be consistently supplied ty the CC-Ditch Company and <br />adequately applied to the crop by the sideroll sprinkler system. <br />Enclosed is a water budget for alfalfa growing in the Nucla area. The consumptive water use of <br />the crop and the effective precipitation included in the budget are long-term climate induced <br />averages. Irrigation events are scheduled when one half of the available soil moisture is depleted <br />by the crop, in this case 3.8 inches. This depletion occurs at different rates during the growing <br />season, as is evident by the monthly consumptive use column (see water budget). In the month <br />of May only 3.61 inches of water is used by alfalfa, so only one irrigation event that replaces this <br />depletion is necessary in May. In the month of July 6.83 inches of water is used by the crop, so <br />two irrigations are required, each replacing about 3.8 inches of depletion. Since it takes thirteen <br />(13) days for each sideroll to cover its intended area of 23 acres, all three siderolls will need to be <br />operating simultaneously (26 out of 31 days) to meet this peak demand in July. <br />The Natural Resource Conservation Service works in partnership with the American People <br />to conserve and sustain natural resources on private lands. An Equal Opportunity Provider and Employer.
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