PEACE RIVER MANASOTA REGIONAL WATER SUPPLY AUTHORITY BOARD OF DIRECTORS MEETING December 5, 2018 ROUTINE STATUS REPORTS ITEM 1

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1 PEACE RIVER MANASOTA REGIONAL WATER SUPPLY AUTHORITY BOARD OF DIRECTORS MEETING December 5, 218 ROUTINE STATUS REPORTS ITEM 1 Hydrologic Conditions Report

2 MEMORANDUM Project: Hydrologic Conditions Report Date: December 5, 218 Developed By: Mike Coates, Deputy Director This memorandum summarizes rainfall and surface water conditions, and the Authority s current water storage and supply conditions for the month of November 218, and the preceding 12-month period. Rainfall Conditions & Projections Rainfall in the Peace River Basin for the past 12-months is.3 inch below-normal. This data covers the 12-months through November 18 th (see Table 1). Rainfall for November 218 (through 11/18) totaled 1.66 inches while the historical average rainfall for the full month of November is 1.73 inches. Region-wide rainfall conditions reported by SWFWMD for the 12-month period ending October 218 are shown in Figure 1 (this is most up-to-date map available). Conditions shown for the Authority s 4-county service area on Figure 1 generally indicate below normal rainfall conditions in the coastal region and near normal conditions inland. Projections for the next three months (December - February) from NOAA are for abovenormal temperatures and above-normal rainfall for southwest Florida. The NOAA extended forecast is for development of weak El Nino conditions through winter and spring 219. El Nino typically brings cooler wetter winters to the Florida peninsula. Table 1 (Peace River Basin Rainfall - Inches) Item Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Total (1) Long-Term Avg Actual Past 12 Months Difference (1) Rainfall 11/1 through 11/18

3 Figure 1 (SWFWMD Rainfall Conditions Map) River Flow Conditions The locations of two U.S. Geological Survey gages, one in the upper portion of the basin and one in the lower portion are shown in Figure 2, and flow conditions at these gages are discussed below: November 218 flow in the Peace River at Fort Meade (upper part of the watershed) was near historical normal levels (see Figure 3). The Peace River at Arcadia gage (about 15 miles upstream of the Authority s intake) is one of the gages used to calculate how much water the Authority can withdraw from the river each day. Flow at the Peace River at Arcadia gage (lower part of the watershed) was also near it s historical average in November (see Figure 4). 2

4 Figure 2 (Peace River Basin showing selected gage locations and Location of PRF) USGS Peace Fort Meade Drainage Area 48 sq. miles Peace River Facility USGS Peace Arcadia Drainage Area 1367 sq. miles Figure 3 (Peace River Fort Meade) River Flow in Cubic Ft./ Second Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 PR Ft. Meade (cfs) Historical Average Flow (cfs) 3

5 Figure 4 (Peace River Arcadia) River Flow in Cubic Ft./ Second PR Arcadia (cfs) Historical Average Flow (cfs) Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 River Withdrawals, Finished Water Production & Demand Water withdrawals from the Peace River in October and November were limited by the near-full raw water storage conditions. Average withdrawals of near 4 MGD (both months) were adequate to maintain the full raw water storage condition in the reservoir system. Figure 5 (Withdrawals from Peace River) River Withdrawals in MGD Nov 217 Dec 217 Jan 218 Feb 218 Mar 218 Apr 218 May 218 Jun 218 Jul 218 Aug 218 Sept 218 Oct 218 Nov 218 4

6 Figure 6 shows monthly finished water deliveries to Customers for the 12-month period ending mid-november 218. Finished water delivery to Customers during November averaged about 25 MGD. This is about the same as deliveries in November 217. Seasonal exchange with Punta Gorda is ongoing with Regional System deliveries to the City. Figure 6 (Peace River Facility Deliveries to Customers) Finished Water Delivered (MGD) Nov 217 Dec Jan 218 Feb Mar 218 Apr 218 May Jun Jul Aug Sept Oct Nov 218 Stored Supplies at the PRF The Authority maintains two large capacity off-stream storage systems at the PRF. The primary storage is raw river water stored in Reservoir No. 1 and No. 2. When flow in the River is high enough, a small percentage of that flow is harvested at the Authority s pumping facility on the Peace River and stored in Reservoirs 1 and 2. This storage is designed to be completely refilled each wet season. Total raw-water storage capacity is seasonally adjusted. During the hurricane season the total raw water storage capacity is 6.5 billion gallons (BG). Outside of hurricane season, additional water can be safely stored. The maximum raw water storage capacity in November is 6.75 BG. Raw water stored as of mid-november 218 totaled about 6.7 BG. The secondary storage at the PRF is treated water stored in the Aquifer Storage and Recovery (ASR) system. The design capacity of the ASR system was approximately 6.3 BG, however a much greater volume can be stored in this system. Because this supply must be fully treated to drinking water standards before storage, it can t be stored as rapidly as water in the raw-water reservoirs. Filling ASR storage is done incrementally each year as excess treatment capacity and hydrologic condition allow. The ASR system is currently in storage which means that water is not presently being injected or recovered from the system. Water recovered from ASR is discharged to the surface reservoir system and undergoes full treatment again with the rest of the raw-water stream before delivery to 5

7 Authority Customers. Treated water stored in ASR as of mid-november 218 totaled 7.8 BG. Stored raw water supplies (combined storage in Reservoir No. 1 and No. 2) and stored water in the ASR system for the past year are shown in Figure 8. The total water in storage as of mid-november 218 was about 14.5 BG. This is about 1.1 BG more than the water in storage as of November 217. Figure 8 (Stored Water Supplies) Stored Supplies in Million Gallons Nov Dec Jan Feb Mar Apr May Jun Jul 218 Aug 218 Sept 218 Oct 218 Nov 218 Treated Water Storage in ASR (MG) Total Raw Water Storage (MG) 6