CC 2017-07-25_09i Monthly Water Supply_Demand Update June 2017
MEMORANDUM
TO: CITY COUNCIL
FROM: CHRISTOPHER MAGDOSKU, DIRECTOR OF PUBLIC WORKS
BY: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: JULY 25, 2017
RECOMMENDATION:
It is recommended the City Council receive and file the monthly Water Supply and
Demand Report.
SUMMARY OF ACTION:
Review the report of the monthly water supply in Lopez Reservoir.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
Approximately two (2) hours of staff time is required to prepare the monthly report.
BACKGROUND:
On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water
Shortage Emergency and related emergency water conservation measures and
restrictions. During the public hearing the City Council requested 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 that the previously adopted
permanent water saving measures are still in effect.
In June, the City’s water use was 32% below June 2013. The State’s required reduction
was based on the 2013 water usage. There is currently no required reduction imposed
by the State Water Resources Control Board. The City however, is still required to
report monthly statistics to the State. As a comparison for a single month, water usage
statistics were 11% higher in June 2017 than June 2016.
ANALYSIS OF ISSUES:
The United States Department of Agriculture (USDA) Drought Monitor, as of July 6,
2017, shows San Luis Obispo County as abnormally dry. Rain fall to date (July 1, 2016
to June 30, 2017) is 26.75 inches at the Corporation Yard gauge. Lopez Lake, as of
July 11, 2017, is at 59% capacity (29,669 acre-feet of storage).
Item 9.i. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
JULY 25, 2017
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Board rescinded the drought emergency proclamation.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
the 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 began on April 1, 2017 and the current total available
supply from Lopez is 2,290 acre-feet, the City’s normal entitlement, plus 1,249 acre-feet
of carryover. In addition, the City has 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, the City 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.
Attachments:
1. Lopez Reservoir Storage Projections
2. Zone 3 – Lopez Project – Monthly Operations Report
Item 9.i. - Page 2
6.720.694.160.582.591.813.6214.439.061.691.570.240.030.020.3729,9390.002.004.006.008.0010.0012.0014.0016.0018.0020.004,0009,00014,00019,00024,00029,00034,00039,00044,00049,00012/1/20151/1/20162/1/20163/1/20164/1/20165/1/20166/1/20167/1/20168/1/20169/1/201610/1/201611/1/201612/1/20161/1/20172/1/20173/1/20174/1/20175/1/20176/1/20177/1/20178/1/20179/1/201710/1/2017Monthly Precipitation (in)Storage(AF)Notes:• For "Dry Months" (April ‐ October), projected increases and/or decreases in storage estimated to mimic conditions from 2015.• For "Wet Months" (November ‐ March), projected storage declines assume LRRP annual downstream release of 3,800 AFY and dLopez Reservoir Storage Projections(precipitation scenario source: www.LongRangeWeather.com)Actual PrecipitationProjected PrecipitationActual StorageProjected StoragePast 3 Year Avg. ProjectionStorage Without Carryover15,000 AF10,000 AFATTACHMENT 1Item 9.i. - Page 3
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportJune, 20170.00Note: 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.538.44April to Present37.48Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)498.01Storage (full at 49200 acre feet)29938Rainfall0Downstream Release (4200 acre feet/year)273.44Spillage (acre feet)0This MonthYear to Date594.140.001249.20189.96Entl.SurplusUsage3539.20TotalLopez Water Deliveries139.26Oceano CSD303840.5048.841143.50188.79Grover Beach800240.2060.421040.20146.62Pismo Beach8961834.20146.622730.2020.87CSA 12241499.608.94740.60451.395050.0029.2769.966.320.0000.00State Water Deliveries1033.9845304663.70454.789193.70525.66684.9615.52Total ContractorDifference (feet)-24.36% Full60.8%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 totalof 2.53 AF delivered to Canyon Crest was added to Oceano's State Water usage this month and 2.53 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Jul'16Aug'16Sep'16Oct'16Nov'16Dec'16Jan'17Feb'17Mar'17Apr'17May'17Jun'17Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080100120140Jul'16Aug'16Sep'16Oct'16Nov'16Dec'16Jan'17Feb'17Mar'17Apr'17May'17Jun'17Acre FeetOCSDPBCSA12SanMigSan Miguelito45.001109.20This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request189.96Total Water Deliveries This Month48.8460.42146.6215.269.2470.30Annual Request0.00Usage0.000.000.000.00%0.000.000.000.000.00538.44139.26188.79146.6220.871033.980.00857.00SWP DeliveriesSWP DeliveriesChange in Storage10892.48817.27This Month Stored State Water0.0%8.3%15.2%16.1%12.2%7.6%18.1%16.4%5.4%3.7%2.8%0.0%89.4%9.0%41.8%0.0%0.0%10.0%11.2%2.3%76.7%8.4%40.9%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%23.5%46.0%23.6%16.4%8.7%22.8%0.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%720.6Last Month Stored State WaterFriday, July 7, 2017Page 1 of 1Report printed by:AdminData entered by:J. OgrenATTACHMENT 2Item 9.i. - Page 4