2.6 WATER REQUIREMENTS BY ZONE

Water production requirements are typically analyzed for a system as a whole to assure that there is adequate water available for the system. However, it is also beneficial to look at requirements by zone for infrastructure planning, which this report analyzes in later section. As such, BC&A completed an ERC analysis by zone.

Billing data for 2019 was provided by the City as the latest typical use year, as well as the ERC count the City completed for that year. Based on water use from the billing data, ERCs were determined for each pressure zone in 2019. This data was then compared to the 2013 ERC values that were used in the previous master plan. Since the previous master plan, the City has kept track of approved developments in each zone. The projected ERCs were compared to the currently approved developments to determine how many ERCs remain approved, but not constructed. This was projected forward to 2021 to provide final ERC projections by zone. Table 2-5 shows the results of this analysis, as well as the buildout ERCs for each zone.

Table 2-5
ERCs by Zone

Year	TOTAL	Zone 1	Zone 2	Zone 3	Zone 4	Zone 5	Zone 6	Zone 7
2013	37,993	11,493	5,834	9,473	5,526	4,983	684	0
2014	38,470	11,532	5,840	9,518	5,623	5,144	829	0
2015	38,952	11,571	5,845	9,563	5,720	5,305	974	0
2016	39,441	11,609	5,850	9,608	5,817	5,466	1,119	0
2017	39,935	11,648	5,856	9,652	5,914	5,627	1,264	0
2018	40,436	11,687	5,861	9,697	6,010	5,788	1,408	0
2019	40,943	11,725	5,866	9,742	6,107	5,949	1,553	0
2020	41,456	11,766	5,872	9,788	6,208	6,117	1,705	0
2021	41,976	11,807	5,878	9,836	6,311	6,288	1,858	0
Approved, Not Completed	6,638	522	72	604	1,307	2,175	1,957	0
2021 + Approved, Not Completed	48,614	12,329	5,950	10,439	7,618	8,463	3,815	0
Buildout	66,253	12,800	6,106	11,147	15,178	11,621	6,869	2,532

 

Once the ERCs by zone have been set, water requirements by zone can be determined. Previously, the peak day water supply requirement was determined based on the State's minimum sizing requirement. This is necessary for supply redundancy for the system as a whole. For modeling and infrastructure planning in individual zones, peak demand without redundancy can be used. Table 2-6 details the peak water demand by zone for 2021 and at buildout.

Table 2-6
Water Demand by Zone

Pressure Zone	2021 Peak Day Demand (gpm)	Buildout Peak Day Demand (gpm)
Zone 1	11,583	12,211
Zone 2	5,766	5,911
Zone 3	9,649	10,478
Zone 4	6,191	11,797
Zone 5	6,168	9,540
Zone 6	1,823	4,991
Zone 7	0	1,601
Total	41,181	56,528