5.3.5 Comal County Water Supply Plan
Table 5.3.5-1 lists each water user group in Comal County and their corresponding surplus or shortage in years 2030 and 2050. For each water user group with a projected shortage, or need, a water supply plan has been developed and is presented in the following subsections.
Table 5.3.5-1.
Comal County Surplus/Shortage
|
Water
User Group |
Surplus/Shortage1 |
Comment |
|
|
2030 |
2050 |
||
|
City of Fair Oaks Ranch |
|
|
See Bexar County |
|
City of Garden Ridge |
-562 |
-617 |
Projected shortage – see plan below |
|
City of New Braunfels |
-14,801 |
-21,051 |
Projected shortage – see plan below |
|
City of Schertz |
|
|
See Guadalupe County |
|
Rural Area Residential and Commercial |
-11,094 |
-19,601 |
Projected shortage – see plan below |
|
Industrial |
1 |
-551 |
Projected shortage – see plan below |
|
Steam-Electric Power |
0 |
0 |
No projected demand |
|
Mining |
-5,796 |
-2,224 |
Projected shortage – see plan below |
|
Irrigation |
631 |
665 |
Projected surplus |
|
Livestock |
0 |
0 |
No projected surplus/shortage |
|
1 From Table 4-5,
Section 4.1 – Water Needs Projections by Water User Group. |
|||
5.3.5.1 City of Fair Oaks Ranch (See Bexar County)
5.3.5.2 City of Garden Ridge
The City of Garden Ridge’s current water supply is obtained from the Edwards Aquifer. The City of Garden Ridge is projected to need additional water supplies beginning in the year 2000. The following options were considered to meet the city’s projected need:
§ Demand Reduction (Conservation) (L-10 Mun.)
§ Canyon Reservoir – River Diversion (G-15C)
§ Carrizo Aquifer – Gonzales & Bastrop (CZ-10D)
Working within the planning criteria established by the SCTRWPG and the TWDB, it is recommended that the City of Garden Ridge implement the following water supply plan to meet the projected need for the city (Table 5.3.5-2).
§ Municipal demand reduction (conservation) to be implemented in 2000. This project can provide an additional 35 acft/yr of supply in 2000, increasing to 41 acft/yr of additional supply in 2050. (See Section 6, Supplement 2 and Volume III, Section 1.1)
§ Canyon Reservoir – River Diversion (G-15C) to be implemented in 2000. This project can provide an additional 400 acft/yr of supply in 2000, increasing to 700 acft/yr of additional supply in 2050.
Table 5.3.5-2.
Recommended Water Supply Plan for the City of Garden Ridge
|
|
2000
(acft/yr) |
2010
(acft/yr) |
2020
(acft/yr) |
2030
(acft/yr) |
2040
(acft/yr) |
2050
(acft/yr) |
|
Projected Need (Shortage) |
322 |
395 |
434 |
562 |
623 |
617 |
|
Recommended Plan |
|
|
|
|
|
|
|
Demand Reduction (Conservation) (L-10 Mun.) |
35 |
40 |
46 |
38 |
41 |
41 |
|
Canyon Reservoir – River Diversion (G-15C) |
400 |
450 |
500 |
700 |
700 |
700 |
|
Total New Supply |
435 |
490 |
546 |
738 |
741 |
741 |
The costs of the recommended plan to meet the City of Garden Ridge’s projected need are shown in Table 5.3.5-3.
Table 5.3.5-3.
Recommended Plan Costs by Decade for the City of Garden Ridge
|
Plan
Element |
2000 |
2010 |
2020 |
2030 |
2040 |
2050 |
|
Demand Reduction
(Conservation) (L-10 Mun.) |
|
|
|
|
|
|
|
Annual Cost ($/yr) |
$10,503 |
$10,271 |
$10,037 |
$3,951 |
$3,719 |
$3,249 |
|
Unit Cost ($/acft) |
$300 |
$257 |
$218 |
$104 |
$91 |
$79 |
|
Canyon Reservoir – River
Diversion (G-15C) |
|
|
|
|
|
|
|
Annual Cost ($/yr) |
$310,983 |
$349,856 |
$371,500 |
$440,300 |
$440,300 |
$440,300 |
|
Unit Cost ($/acft) |
$777 |
$777 |
$743 |
$629 |
$629 |
$629 |
5.3.5.3 City of New Braunfels
The City of New Braunfels’ current water supply is obtained from the Edwards Aquifer, Canyon Reservoir and run-of-river rights. The City of New Braunfels is projected to need additional water supplies beginning in the planning year 2010. The following options were considered to meet the city’s projected need:
§ Demand Reduction (Conservation) (L-10 Mun.)
§ Canyon Reservoir – River Diversion (G-15C)
§ GBRA Canyon Reservoir Contract Renewal
§ Carrizo Aquifer – Gonzales & Bastrop (CZ-10D)
§ Additional Storage (ASR and/or Surface)
Working within the planning criteria established by the SCTRWPG and the TWDB, it is recommended that the City of New Braunfels implement the following water supply plan to meet the projected need for the city (Table 5.3.5-4).
§ Municipal demand reduction (conservation) to be implemented in 2000. This project can provide an additional 583 acft/yr of supply in 2000, increasing to 904 acft/yr of additional supply in 2050. (See Section 6, Supplement 2 and Volume III, Section 1.1)
§ Canyon Reservoir – River Diversion (G-15C) to be implemented in 2000. This project can provide an additional 580 acft/yr of supply in 2000, increasing to 10,000 acft/yr of additional supply in 2030 through 2050.
§ GBRA Canyon Reservoir Contract Renewal to be implemented in 2001. This project can provide an additional 6,720 acft/yr of supply.
§ Carrizo Aquifer – Gonzales & Bastrop (CZ-10D) to be implemented in 2040. This project can provide an additional 4,000 acft/yr of supply in 2040, increasing to 7,000 acft/yr of additional supply in 2050.
§ Additional Storage (ASR and/or Surface)
Table 5.3.5-4.
Recommended Water Supply Plan for the City of New Braunfels
|
|
2000
(acft/yr) |
2010
(acft/yr) |
2020
(acft/yr) |
2030
(acft/yr) |
2040
(acft/yr) |
2050
(acft/yr) |
|
Projected Need (Shortage) |
0 |
7,817 |
10,697 |
14,801 |
17,765 |
21,051 |
|
Recommended Plan |
|
|
|
|
|
|
|
Demand Reduction (Conservation) (L-10 Mun.) |
583 |
680 |
804 |
683 |
785 |
904 |
|
Canyon Reservoir – River Diversion (G-15C) |
580 |
580 |
7,200 |
10,000 |
10,000 |
10,000 |
|
GBRA Canyon Reservoir Contract Renewal |
|
6,720 |
6,720 |
6,720 |
6,720 |
6,720 |
|
Carrizo Aquifer – Gonzales
& Bastrop (CZ-10D)1 |
|
|
|
|
4,000 |
7,000 |
|
Additional Storage (ASR
and/or Surface)2 |
|
|
|
|
|
|
|
Total New Supply |
1,163 |
7,980 |
14,724 |
17,403 |
21,505 |
24,624 |
|
1 Region L estimates of
groundwater development exceed Region K estimates of availability in and
beyond 2030. The regions have agreed
that discussion of differences will be more productive upon completion of new
Groundwater Availability Models. 2 Includes, but is not limited to, small reservoirs near regional water treatment facilities to provide balancing storage necessary to meet peak seasonal and daily water needs. |
||||||
The costs of the recommended plan to meet the City of New Braunfels’ projected need are shown in Table 5.3.5-5.
Table 5.3.5-5.
Recommended Plan Costs by Decade for the City of New Braunfels
|
Plan
Element |
2000 |
2010 |
2020 |
2030 |
2040 |
2050 |
|
Demand Reduction
(Conservation) (L-10 Mun.) |
|