2011-05-20_HYDROLOGY - M1999005 - Laserfiche WebLink

Home Browse Search

Mr. Frank Healy Page 2 4/28/2011 Stream Depletions The gravel pit is located about 300 feet north of the Arkansas River. A Glover analysis was used to estimate the timing of stream depletions. A stream depletion factor of 7.5 days was taken from "Stream Depletion Factors, Arkansas River Valley, Southeastern Colorado" by C.T. Jenkins and O. James Taylor (USGS OFR 72-192). Steady state conditions were assumed and the monthly water uses estimates from Table 1A (attached) were used. Replacement of Stream Depletions Based on the present share yield of 1.0 acre-feet per LAWMA share, All-Rite proposes to use a portion of the 36 LAWMA shares leased during LAWMA's 2010 water year as the source of replacement water for the period January 1, 2011 through March 31, 2011. The agreement between All-Rite and LAWMA for the administration and accounting of the replacement water is attached. All-Rite proposes to use a portion of the 40 acre-feet of fully consumable water leased from AGUA over AGUA's 2011 water year for the period April 1, 2011 through December 31, 2011. Together, these two supplies are to provide 36 acre-feet of replacement water for this plan year from January 1, 2011 - December 31, 2011. Accounting The attached Table 1 B is the monthly accounting form that will be used for determining water use and stream depletions. All-Rite will submit the monthly pit area, product mined, and diversions from-the pit for dust suppression to LAWMA/AQUA, which will then submit the monthly water accounting to the Division Engineer. Conditions of Approval I hereby approve the proposed substitute water supply plan in accordance with Section 37-80-120, C.R.S., subject to the following conditions: 1. Total consumptive losses of 35.06 acre-feet, of which 2.0 acre-feet will be used for dust suppression from the pit, 1.5 acre-feet will be hauled away as product moisture, and 31.56 acre-feet will evaporate from the pit's water surface, shall not be exceeded during the period of time that this plan is in effect. Should the total consumptive use at the pit exceed 35.06 acre-feet per year prior to the expiration of this plan, an amendment will need to be filed with this office. 2. Adequate accounting of depletions and replacements must be provided to the Water Commissioner and/or Division Engineer on a monthly basis or other interval acceptable to both of them. The accounting of depletions should be in the format similar to that shown on Table 1 B. The accounting form(s) shall be sufficient to demonstrate that the net effective replacement equals or exceeds the total depletion on a monthly basis. All replacement water must be concurrent with depletions in quantity, timing and location, except that releases aggregated at the discretion of the Division Engineer or the Augmentation Coordinator may occur in a later month than the depletions. 3. The accounting form submitted in the month of November each year (at the end of the administrative Water Year) shall be submitted together with plan and cross-sectional drawings of the pit on 8-1/2" x 11" paper showing; (1) the initial static water level, (2) the