CC 2018-03-27_09c Monthly Water Supply and Demand Update_February2018
MEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: MARCH 27, 2018
SUMMARY OF ACTION:
The update reports the water supply and demand for February 2018. Current Lopez
Reservoir levels and projected levels are provided in the attachments.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
Approximately two (2) hours of staff time is required to prepare the report.
RECOMMENDATION:
It is recommended the City Council receive and file the monthly Water Supply and
Demand Report.
BACKGROUND:
On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water
Shortage Emergency and related water conservation measures and restrictions. During
the public hearing the City Council requested that staff to continue preparing the
monthly water supply and demand updates. The Council also urged citizens to remain
cognizant of how they use water, and reminded citizens that the previously adopted
water saving measures are still in effect.
In February 2018, the City’s water use was 163.9 acre-feet with a per capita use of 108
gallons per day/per person. There was a total of 0.2” of rainfall in February. The water
use for the current “rolling” water year from February 2017 to February 2018 was 2,383
acre-feet, which equates to a per capita use of 121 gallons per day/per person. There
was a total of 12” of rainfall for this period.
ANALYSIS OF ISSUES:
As of March 13, 2018, the United States Drought Monitor shows San Luis Obispo
County in a severe drought. Rainfall to date (July 1, 2017 to March 16, 2018) is 5.13
inches at the Corporation Yard rain gauge. Lopez Lake, as of March 16, 2018 is at
50.2% capacity (24,798 acre-feet of storage).
Item 9.c. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
MARCH 27, 2018
PAGE 2
At the County of San Luis Obispo Board of Supervisors meeting on May 23, 2017, the
Board rescinded the drought emergency proclamation. However, as recommended by
Zone 3 Advisory Board, the Board of Supervisors kept the Low Reservoir Response
Plan in place. This will allow carryover water to be available until March 30, 2018 to all
contractors. The new water year will begin on April 1, 2018 and new allocations will be
available. The current total available supply from Lopez is 2,290 acre-feet, our normal
entitlement, plus 1,249 acre-feet of carryover. In addition, we have 1,323 acre-feet of
ground water entitlement from the Santa Maria Basin and 200 acre-feet from the Pismo
Formation.
Based on the projected water use of 2,500 acre-feet, we will meet the demand in water
year 2017/18, using only 50% of current supply.
ADVANTAGES:
No advantages noted at this time.
DISADVANTAGES:
No disadvantages noted at this time.
ALTERNATIVES:
Not applicable at this time.
ENVIRONMENTAL REVIEW:
No environmental review is required for this item.
PUBLIC NOTIFICATION AND COMMENTS:
The Agenda was posted at City Hall and on the City’s website in accordance with
Government Code Section 54954.2.
Attachment:
1. Lopez Reservoir Storage Projections
2. Zone 3 – Lopez Project – Monthly Operations Report
Item 9.c. - Page 2
2.591.813.6212.499.061.691.570.240.210.082.500.2024681012140.05,000.010,000.015,000.020,000.025,000.030,000.035,000.040,000.07/1/20168/1/20169/1/201610/1/201611/1/201612/1/20161/1/20172/1/20173/1/20174/1/20175/1/20176/1/20177/1/20178/1/20179/1/201710/1/201711/1/201712/1/20171/1/20182/1/20183/1/20184/1/20185/1/20186/1/20187/1/20188/1/20189/1/201810/1/201811/1/201812/1/20181/1/20192/1/20193/1/20194/1/20195/1/20196/1/2019Monthly Precipitation (in)Storage (AF)DateLOPEZ RESERVOIR STORAGE PROJECTIONActual PrecipitationActual StorageProjected Storage20,000 AFStorage w/o CarryoverNote: Storage Projection is based on Water Years 14/15 and 15/16 municipaland downstream releases, rainfall, and evaporation.5 of 12ATTACHMENT 1Item 9.c. - Page 3
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportFebruary, 2018720.14Note: Deliveries are in acre feet. One acre foot = 325, 850 gallons or 43, 560 cubic feet. Safe yield is 8,730 acre feet."Year to Date" is January to present for State water, April to present for Lopez deliveries, and July to present for rainfall.2002.19April to Present7.76Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)489.62Storage (full at 49200 acre feet)24745Rainfall3.97Downstream Release (4200 acre feet/year)222.19Spillage (acre feet)0This MonthYear to Date3189.130.001249.20146.13Entl.SurplusUsage3539.20TotalLopez Water Deliveries656.89Oceano CSD303840.500.001143.50682.75Grover Beach800240.2058.031040.201258.35Pismo Beach8921834.200.002726.2084.75CSA 12245499.605.10744.609.0011200.0010.10275.050.002270.00State Water Deliveries4684.9345304663.70209.269193.7030.66150110.41Total ContractorDifference (feet)-32.75% Full50.3%Comments:Reservoir is currently operated under the Low Reservoir Response Plan. Reservoir is above 20,000 AF therefore no reduction in entitlements.Surplus water shown is actually "Carry Over" water as designated in the LRRP and updated per BOS May 2, 2017 Declaration of Surplus. 1) Oceano supplied State Water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 1.55 AF delivered to Canyon Crest was added to Oceano's State Water usage this monthand 1.55 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Apr'17May'17Jun'17Jul'17Aug'17Sep'17Oct'17Nov'17Dec'17Jan'18Feb'18Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage0246810Apr'17May'17Jun'17Jul'17Aug'17Sep'17Oct'17Nov'17Dec'17Jan'18Feb'18Acre FeetOCSDPBCSA12SanMigSan Miguelito11.561275.36This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request146.13Total Water Deliveries This Month50.3158.03123.5510.155.36393.53Annual Request0.00Usage50.310.00123.550.00%0.00353.790.00366.350.002002.19303.10682.75892.0084.753964.79173.8644.00SWP DeliveriesSWP DeliveriesChange in Storage4433.591143.09This Month Stored State Water15.4%6.4%56.6%0.0%57.4%7.3%65.6%0.0%46.2%2.1%11.4%0.0%0.8%18.7%37.4%0.0%0.0%4.6%51.0%0.7%2.0%4.2%9.1%0.0%6.0%0.0%6.7%0.0%0.0%42.1%0.0%20.0%0.0%87.4%100.0%85.3%100.0%34.6%87.5%3.7%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1109.5Last Month Stored State WaterWednesday, March 7, 2018Page 1 of 1Report printed by:AdminData entered by: D. SPIEGEL4 of 12ATTACHMENT 2Item 9.c. - Page 4