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WATER STORAGE
Water production sources are typically sized for a peak day scenario, but as flow varies throughout the day, demands can be significantly higher. Storage becomes an integral part of delivering water to meet fluctuating demands throughout the day. Storage is also needed for firefighting needs as well as various other operational scenarios. As noted above, the State's minimum sizing requirements set an equalization storage value of 650 gallons per ERC. Each pressure zone also has a specific fire storage and operational storage amount. Table ES-6 shows the calculated storage requirements based on existing ERCs. Table ES-7 shows the same information for existing ERCs plus all previously approved development. Table ES-8 shows the same analysis for projected development at buildout.
Table ES-6
Storage Requirements - Existing
Pressure Zone
Existing ERCs
Current Storage (MG)
Equalization Storage (MG)
Fire Storage (MG)
Emergency Storage (MG)
Total Storage (MG)
Surplus / (Deficit)
Pressure Zone
Existing ERCs
Current Storage (MG)
Equalization Storage (MG)
Fire Storage (MG)
Emergency Storage (MG)
Total Storage (MG)
Surplus / (Deficit)
1
11,807
10.5
7.7
1.2
4.7
13.6
(3.1)
2
5,878
10
3.8
1.2
4.8
9.8
0.2
3
8,111
9
5.3
1.0
0.0
6.3
2.7
3A
410
0
0.3
0.0
0.0
0.3
(0.3)
3B
1,316
0
0.9
0.0
0.0
0.9
(0.9)
4
6,311
11
4.1
1.2
1.6
6.9
4.1
5
6,288
0
4.1
1.2
0.0
5.3
(5.3)
6
1,858
6
1.2
1.2
1.0
3.4
2.6
Total
41,979
46.5
27.3
7.0
12.1
46.4
0.1
 
Table ES-7
Storage Requirements - Existing & Previously Approved Development
Pressure Zone
Existing & Approved, Not Constructed ERCs
Current Storage (MG)
Equalization Storage (MG)
Fire Storage (MG)
Emergeny Storage (MG)
Total Storage (MG)
Surplus / (Deficit)
Pressure Zone
Existing & Approved, Not Constructed ERCs
Current Storage (MG)
Equalization Storage (MG)
Fire Storage (MG)
Emergeny Storage (MG)
Total Storage (MG)
Surplus / (Deficit)
1
12,329
10.5
8.0
1.2
4.7
13.9
(3.4)
2
5,950
10
3.9
1.2
4.8
9.9
0.1
3
8,609
9
5.6
1.0
0.0
6.6
2.4
3A
435
0
0.3
0.0
0.0
0.3
(0.3)
3B
1,396
0
0.9
0.0
0.0
0.9
(0.9)
4
7,618
11
5.0
1.2
4.8
11.0
0.0
5
8,463
0
5.5
1.2
0.0
6.7
(6.7)
6
3,815
6
2.5
1.2
1.0
4.7
1.3
7
0
0
0.0
0.8
0.0
0.8
(0.8)
Total
48,615
46.5
31.6
7.8
15.3
51.5
(8.2)
 
Table ES-8
Storage Requirements - All Projected Development at Buildout
Pressure Zone
Buildout ERCs
Current Storage (MG)
Equalization Storage (MG)
Fire Storage (MG)
Emergency Storage (MG)
Total Storage (MG)
Surplus / (Deficit) 1
Pressure Zone
Buildout ERCs
Current Storage (MG)
Equalization Storage (MG)
Fire Storage (MG)
Emergency Storage (MG)
Total Storage (MG)
Surplus / (Deficit) 1
1
12,800
10.5
8.3
1.2
4.7
14.2
(3.7)
2
6,106
10
4.0
1.2
4.8
10.0
0.0
3
8,631
9
5.6
1.0
0.0
6.6
2.4
3A
414
0
0.3
0.0
0.0
0.3
(0.3)
3B
2,102
0
1.4
0.0
0.0
1.4
(1.4)
4
15,178
11
9.9
1.2
4.8
15.9
(4.9)
5
11,621
0
7.6
1.2
0.0
8.8
(8.8)
6
6,869
6
4.5
1.2
1.0
6.7
(0.7)
7
2,532
0
1.6
0.8
0.0
2.4
(2.4)
Total
66,253
46.5
43.1
7.8
15.3
66.2
(19.7)
 
As can be seen in the tables, the City has just barely enough storage to meet existing conditions. This moves to a deficiency of 5.0 million gallons 2 overall when approved development is considered (with individual deficiencies in multiple zones). By buildout, this deficiency increases to nearly 20 million gallons. The City is currently in the process of designing and constructing additional storage to address the needs of approved development and Table ES-9 lists the tanks planned to be constructed by buildout.
Table ES-9
Additional Storage Needed at Buildout
Pressure Zone
Tank Site
Additional Storage at Buildout (MG)
Pressure Zone
Tank Site
Additional Storage at Buildout (MG)
Zone 1
Cemetery 2
3
Zone 3
Zone 3 North
3
Zone 4
U-111 2
4
Zone 5
Zone 5 North
4
Zone 5
Zone 5 South
4
Zone 6
Bingham Junction 2
3
Zone 7
Zone 7 North
2
Zone 7
Zone 7 South
2
 
2 It should be emphasized that this table is for existing and previously approved development. For existing development only, the City has adequate storage to meet the State sizing requirement. It is only when the previous approved development is added that the deficiency exists.