5.3.12 Hays County Water Supply Plan

Table 5.3.12-1 lists each water user group in Hays 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 5.3.12-1.
Hays County Surplus/Shortage

Water User Group	Surplus/Shortage^1		Comment
	2030 (acft/yr)	2050 (acft/yr)
City of Kyle	492	-225	Projected shortage – see plan below
City of San Marcos	-9,919	-27,297	Projected shortage – see plan below
City of Wimberley	127	-322	Projected shortage – see plan below
City of Woodcreek	38	31	Projected surplus
Rural Area Residential and Commercial	-6,350	-6,360	Projected shortage – see plan below
Industrial	1,312	1,287	Projected surplus
Steam-Electric Power	36	36	Projected surplus
Mining	-55	-28	Projected shortage – see plan below
Irrigation	512	518	Projected surplus
Livestock	0	0	No projected surplus/shortage
^1From Table 4-12, Section 4.1 – Water Needs Projections by Water User Group.

5.3.12.1 City of Kyle

The City of Kyle’s current water supply is obtained from the Edwards Aquifer. In addition, the City of Kyle has contracted with the Guadalupe-Blanco River Authority (GBRA) for supplies from Canyon Reservoir to be delivered through the Hays/IH35 Water Supply Project which is present in the implementation phase. Without these supplies from Canyon Reservoir, the City of Kyle 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.)

§ Hays/IH35 Water Supply Project (HIH35WSP)

§ GBRA Canyon Reservoir Contract Renewal

Working within the planning criteria established by the SCTRWPG and the TWDB, it is recommended that the City of Kyle implement the following water supply plan to meet the projected need for the city (Table 5.3.12-2).

§ Municipal demand reduction (conservation) to be implemented in 2000. This project can provide an additional 22 acft/yr beginning in year 2000, decreasing to 0 acft/yr of supply in 2030 (see Section 6, Supplement 2 and Volume III, Section 1.1).

§ Hays/IH35 Water Supply Project to be completed in year 2000. This project can provide 589 acft/yr of supply through 2038.

§ GBRA Canyon Reservoir Contract Renewal to be implemented in 2038. This project can provide an additional 589 acft/yr of supply.

Table 5.3.12-2.
Recommended Water Supply Plan for the City of Kyle

	2000 (acft/yr)	2010 (acft/yr)	2020 (acft/yr)	2030 (acft/yr)	2040 (acft/yr)	2050 (acft/yr)
Projected Need (Shortage)^1	0	0	0	0	156	225
Recommended Plan
Demand Reduction (Conservation) (L-10 Mun.)	22	22	22	0	0	0
Hays/IH35 Water Supply Project (HIH35WSP)^2	*	*	*	*
GBRA Canyon Reservoir Contract Renewal^3					589	589
Total New Supply	22	22	22	0	589	589
^1 Includes 589 acft/yr GBRA contract from Canyon Reservoir as current supply to be delivered upon completion of Hays/IH35 Water Supply Project. ^2 The Hays/IH35 Water Supply Project is currently in the implementation phase; however the 589 acft/yr supply from this project has been counted as a current supply for the City of Kyle. ^3 GBRA contract renewal for the Hays/IH35 Water Supply Project.

The costs of the recommended plan to meet the City of Kyle’s projected need are shown in Table 5.3.12-3.

Table 5.3.12-3.
Recommended Plan Costs by Decade for the City of Kyle

Plan Element	2000	2010	2020	2030	2040	2050
Demand Reduction (Conservation) (L-10 Mun.)
Annual Cost ($/yr)	$8,822	$8,822	$8,822	$0	$0	$0
Unit Cost ($/acft)	$401	$401	$401	$0	$0	$0
Hays/IH35 Water Supply Project (HIH35WSP)
Annual Cost ($/yr)	N/A^1	N/A^1	N/A^1	N/A^1
Unit Cost ($/acft)	N/A^1	N/A^1	N/A^1	N/A^1
GBRA Canyon Contract Renewal (GBRA)
Annual Cost ($/yr)					N/A^2	N/A^2
Unit Cost ($/acft)					N/A^2	N/A^2
^1 This project is currently underway with existing funds, therefore, no cost has been projected. ^2.Cost would be to renew an existing contract acquired under existing funds, therefore no new cost shown.

5.3.12.2 City of San Marcos

The City of San Marcos’ current water supply is obtained from the Edwards Aquifer and Canyon Reservoir. The City of San Marcos 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.)

§ Purchase Water from Major Provider(s) (PMP)

§ Colorado River Diversion Option (LCRA)

§ GBRA Canyon Reservoir Contract Renewal (GBRA)

§ 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 San Marcos implement the following water supply plan to meet the projected need for the city (Table 5.3.12-4).

§ Municipal demand reduction (conservation) to be implemented in 2000. This project can provide an additional 590 acft/yr of supply in 2000, increasing to 1,174 acft/yr of additional supply in 2050. (See Section 6, Supplement 2 and Volume III, Section 1.1)

§ Purchase Water from Major Provider to be implemented in 2000. This project can provide an additional 5,000 acft/yr of supply beginning in 2000.

§ Colorado River Diversion Option (LCRA) to be implemented between 2020 and 2030. This project can provide an additional 4,900 acft/yr of supply in 2030, increasing to 16,500 acft/yr of additional supply in 2050.

§ GBRA Canyon Contract Renewal to be implemented in 2047. This project can provide an additional 5,000 acft/yr of supply in 2050.

§ Additional Storage (Surface and/or ASR)

Table 5.3.12-4.
Recommended Water Supply Plan for the City of San Marcos

	2000 (acft/yr)	2010 (acft/yr)	2020 (acft/yr)	2030 (acft/yr)	2040 (acft/yr)	2050 (acft/yr)
Projected Need (Shortage)	641	2,848	5,629	9,919	15,326	27,297
Recommended Plan
Demand Reduction (Conservation) (L-10 Mun.)	590	690	816	699	906	1,174
Purchase Water from Major Provider (PMP)	5,000	5,000	5,000	5,000	5,000	5,000
Colorado River Diversion Option (LCRA)				4,900	10,000	16,500
GBRA Canyon Contract Renewal (GBRA)	<