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Ready Mix Concrete Substitute Water Supply Plan Page 5 of 9
<br /> November 24, 2020
<br /> Lagged Depletions
<br /> The IDS AWAS stream depletion model was used to determine the lagged depletions from
<br /> dewatering, evaporation, and operational losses at the Morton-Holton Lakes site to Big Dry Creek
<br /> and the South Platte River, using the following Glover parameters:
<br /> • Specific yield = 0.2
<br /> • Transmissivity = 150,000 gpd/ft based on pumping test data in Colorado Ground Water
<br /> Circular No. 11
<br /> • Distance from centroid of the Stage 1 mining area to Big Dry Creek = 300 feet
<br /> • Distance from centroid of the Stage 2 mining area to Big Dry Creek = 1,150 feet
<br /> • Distance from centroid of the Stage 4 mining area to South Platte River = 1,000 feet
<br /> • Distance from centroid of the Stage 5 mining area to South Platte River = 318 feet
<br /> • Distance from centroid of the Stage 6A mining area to the South Platte River = 1,356 feet
<br /> • Distance from centroid of the Stage 6B mining area to the South Platte River = 1,724 feet
<br /> • Distance from centroid of the Stage 6C/6D mining area to South Platte River = 643 feet
<br /> • Distance from Big Dry Creek to alluvial boundary(based upon CDSS South Platte River alluvial
<br /> aquifer boundary mapping
<br /> o 7,250 feet for Stage 1 and 2
<br /> o 8,557 feet for Stage 6A
<br /> o 8,680 feet for Stage 6B
<br /> o 8,400 feet for Stage 4
<br /> 0 9,160 feet for Stage 6C/6D
<br /> 0 1,395 feet for Stage 5
<br /> Based upon this analysis, 95% of the depletions accrue to the stream within 5 months for Stage 1,
<br /> within 14 month for Stage 2, within 19 months for Stage 6A, within 22 months for Stage 613, within
<br /> 16 month at Stage 4, within 12 months at Stage 6C/6D, and within 2 months at Stage 5. Normalized
<br /> lagged factors were developed to determine the timing of lagged depletions to the stream as
<br /> summarized in the table below:
<br /> F,C i DV131U1,i 011 Ul.,i T��'lyl�'tir�n TM��Ia1��1 il.ln 2 DC Iiiii)t SN1.;c 4"Duplul ill'' 1�opl��ti�rn>I S1 M_-L' 1)V]1'0 u1ru
<br /> ;100ill"U AL"I lip", 1.,Y10Tl4F V�konrs I Agrgi13"g'1-,,30(l1,%
<br /> Laggillp,FJ—W rl- Lagging Fay ton Lagging 1~adora
<br /> __.I•'_ L.Irr�� 1.�!rLlll� � l!'�'1,� Lr���IIL� � I_'�11'I,� 1 l!'_'"II!
<br /> V.°1,.!.l F: �11!•1it7 ll_•IkI. N,ow11 Fiil,,-vr Factor N1ol.:11 Q Fn,.or 1'1011th I"I ;tier
<br /> k; I 1 rr°k. 1 o.z_y41 1 1��.1 1 (),524l 1 1j.6917 1
<br /> tiY.I1��al �1. �� F 0, l,�.l , r�ek 1'I 7 ,i+ It 0.1912 7 11,12
<br /> a
<br /> 10 0_0130 10 .f)10� 10 0,016S 10 0,010- 10 I 0,0060
<br /> 11 0.01 L w 11 0.:;11.1y 1 11 _ I S] I] 0.0091 11 _
<br /> 13 0,0095 13 0. - 13 0-0134 13 0.00 7�
<br /> r
<br /> 14 �➢,�i07� 1-# ��,�tl�l.l 14 0.0112 I-# 0,006 I
<br /> 16 0.0(1"1 16 0.0092 1
<br /> 19 19 l J L l'tti
<br /> 21 0.0056
<br /> rZ2 0-0050
<br /> TOTAL. 1_I 10.,1 a T+IT.ti_. 1.ia'1�� TOTAL 1.0000 TOTAL ]_OW0 TOTAL 1.00 1!1 TOTAL 1. �
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