Southwest Aggregates Reservoir Project Summary of Presentation - PowerPoint PPT Presentation

Southwest Aggregates Reservoir Project Summary of Presentation • Overview of conditions in Babcock Webb • Review of Conditions in Yucca Pens • Regional Storage and Conveyance Opportunities • Bond Farm – Store excess water from Babcock Webb • Stored water reserved for Yucca Pens • • SW Aggregates – Cape Coral supplemental water supply • Pathway from Bond Farm to U.S. 41 •

Babcock Webb Hydroperiod SW Babcock Webb • has too much water Optimum hydroperiod • is 4 months Extensive year-round • flooding of wetlands and uplands Well-documented • vegetative impacts Bond Farm Fa CH CH-NCRB_091 9181 816 2

Babcock Webb Water Levels / Hydroperiod • Water levels are elevated in the wet season • Hydroperiods are longer than appropriate • Strong consensus on excessive water conditions Simulated Water Depth at Edge of Tree Island in SW Babcock Webb 2.5 2.0 1.5 Water Depth, ft 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 1/1/08 12/31/08 12/31/09 12/31/10 12/31/11 12/30/12 12/30/13 12/30/14 12/30/15 Depth relative to ground Ground Level BondFarm_ExistingConditionsModel_071719_LT 3

Yucca Pens Hydroperiod Needs • Yucca Pens hydrology generally adequate in wet season • Staff gage data suggests that wetlands in portions of Yucca Pens may have shortened hydroperiods • ATV channel blocks installed in 2013 improved hydrology in south Yucca Pens, but drainage problems remain close to Gator Slough • Hydroperiods in cypress swamps may be adequate, but vegetation indicators and concentrated flow patterns in remnant ATV trails suggest some remaining challenges 4

Estimate of Extent of Yucca Pens Wetlands that May Need Water • FWC Wetland area ≈ 6000 acres • Objective is to extend hydroperiod by 1 – 2 months • Water need is approximately one foot to extend wet season • Water need is ≈ 6,000 acre -feet • Bond Reservoir meets 40% of estimated Yucca Pens need • Improvements needed for hydrologic restoration: ▪ Additional storage ▪ Conveyance to Yucca Pens ▪ Additional channel blocks 5

Summary of Hydroperiods in Babcock Webb and Yucca Pens • Blue areas have too much water • Yellow-red areas do not have enough water 6

Analysis of Bond Water Storage Facility and Southwest Aggregates Reservoir Improvements Scenario Assumptions for Modeling Analysis • Bond Water Storage Facility is 600 acres, max depth = 4 feet for 2,400 ac-ft capacity • SW Agg Reservoir is 500 acres, max range of depth = 10 feet for 5,000 ac-ft capacity • Water pumped into both storage facilities during wet season • Water released from Bond to Yucca Pens at end of wet season ▪ Generally starting in December for one or two months • Water is released from SW Aggregates Reservoir to the City of Cape Coral ▪ Generally starting in March for two to three months ▪ Maintain pressure in reuse lines for irrigation and fire protection to 30% of CC fire hydrants

Estimate of Long-term Available Yield from Babcock Webb WMA • Model simulation conducted from 2007 through 2015 • Water pumped into both reservoirs during wet season and released in dry season • Simulated water delivered from Babcock Webb to reservoirs was 8,200 ac-ft/yr • Water deliveries only during wet season when water levels above set threshold Flows Delivered to Bond Farm and Southwest Aggregates 14,000 12,000 10,000 Acre-feet/Year 8,000 6,000 4,000 2,000 0 2007 2008 2009 2010 2011 2012 2013 2014 2015

Benefits of Southwest Aggregates Reservoir on Babcock Webb WMA • Water depth reductions of up to one foot in areas of with excessive water • Remaining areas of standing water consistent with mapped wetlands • Remaining wetland water depths range from 0.5 to 3 feet ▪ Optimum wet season water depths should be 1 to 2 feet (Duever) • More than enough water in Babcock Webb to fill both reservoirs annually • More water storage needed to restore optimum hydroperiods

Estimate of Water Available for Yucca Pens • Estimated excess water available in Babcock Webb 15,000 ac-ft/yr • Bond provides 2,400 ac-ft/yr • SW Agg provides 4,600 ac-ft/yr • Remaining excess is 8,000 ac-ft/yr • Yucca needs 6,000 ac-ft/yr 10

Summary and Conclusions • Excess water in Babcock Webb WMA currently creating ecological damage • Inadequate water in Yucca Pens • Bond Farm provides some storage but lacks conveyance to YP • SW Aggregates Reservoir provides ▪ Needed water supply growing city ▪ Additional storage for excess water ▪ Potential conveyance to Yucca Pens • Excess water remaining in Babcock Webb WMA with reservoir project 11