CC 2017-10-24_09d Water Supply and Demand Update_September2017
MEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: OCTOBER 24, 2017
SUMMARY OF ACTION:
The update reports the water supply and demand for September 2017. Current Lopez
Reservoir level 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 monthly 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On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water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 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 water saving
measures are still in effect.
In September, the City’s water use was 25% below August 2013. The State’s
previously mandated water use 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 20% higher in September
2017 than September 2016.
ANALYSIS OF ISSUES:
The United States Department of Agriculture (USDA) Drought Monitor, as of October
10, 2017 shows San Luis Obispo County in a moderate drought. Rain fall to date (July
1, 2017 to September 30, 2017) is 0.15 inches at the Corporation Yard gauge. Lopez
Lake, as of October 12, 2017 is at 55% capacity (27,316 acre-feet of storage).
Item 9.d. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
OCTOBER 24, 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Board rescinded the drought emergency proclamation.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
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, 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.d. - Page 2
0.694.160.582.591.813.6214.439.061.691.570.240.721.482.112.762.980.002.004.006.008.0010.0012.0014.0016.0018.0020.004,0009,00014,00019,00024,00029,00034,00039,00044,00049,0002/14/20163/14/20164/14/20165/14/20166/14/20167/14/20168/14/20169/14/201610/14/201611/14/201612/14/20161/14/20172/14/20173/14/20174/14/20175/14/20176/14/20177/14/20178/14/20179/14/201710/14/201711/14/201712/14/20171/14/20182/14/2018Monthly 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 deLopez 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.d. - Page 3
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportSeptember, 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.1107.04April to Present0.16Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)494.45Storage (full at 49200 acre feet)27645Rainfall0.16Downstream Release (4200 acre feet/year)318.55Spillage (acre feet)0This MonthYear to Date1595.940.001249.20204.27Entl.SurplusUsage3539.20TotalLopez Water Deliveries277.64Oceano CSD303840.5046.331143.50364.44Grover Beach800240.2060.171040.20607.40Pismo Beach8921834.20136.622726.2049.74CSA 12245499.607.12744.60451.395050.0049.3069.966.330.0000.00State Water Deliveries2406.2645304663.70454.519193.70579.60684.9616.86Total ContractorDifference (feet)-27.92% Full56.2%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 2.63 AF delivered to Canyon Crest was added to Oceano's State Water usage this month and 2.63 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Jan '17 Feb '17 Mar '17 Apr '17 May '17 Jun '17 Jul '17 Aug '17 Sep '17Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080100120140Jan'17Feb'17Mar'17Apr'17May'17Jun'17Jul '17 Aug'17Sep'17Acre FeetOCSDPBCSA12SanMigSan Miguelito78.9111010.53This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request204.27Total Water Deliveries This Month46.3360.17136.6213.4510.53471.37Annual Request0.00Usage0.000.000.000.00%0.000.000.000.000.001107.04277.64364.44607.4049.742406.260.001295.00SWP DeliveriesSWP DeliveriesChange in Storage3518.141201.33This Month Stored State Water0.0%8.9%31.3%15.3%24.3%7.5%35.0%15.3%22.3%2.9%6.7%0.0%89.4%9.0%70.5%0.0%0.0%10.0%26.2%2.5%84.6%9.6%71.7%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%48.3%91.6%45.6%68.1%20.3%53.1%0.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1179Last Month Stored State WaterWednesday, October 4, 2017Page 1 of 1Report printed by:AdminData entered by: D. SpiegelATTACHMENT 2Item 9.d. - Page 4