introduction project overview - arroyo seco workshop... · 4 24,000 afy 14,000 afy existing supply...
TRANSCRIPT
April 29, 2013
Introduction
Project Overview
Conceptual Design – Area 1
Conceptual Design – Area 2
Conceptual Design – Area 3
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Introduction
Project Overview
Conceptual Design – Area 1
Conceptual Design – Area 2
Conceptual Design – Area 3
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24,000 AFY
14,000 AFY
Existing Supply Mix
(Groundwater & canyon water)
22,800 AFY
14,000 AFY
1,200 AFY
Future Supply Mix with Arroyo Seco Canyon Project
(Groundwater & canyon water)
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Reduce dependence on imported water
Drought-tolerant water supply through groundwater recharge
Cost Savings◦ Imported Water: $1,000/AF◦ Groundwater: $130/AF
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Groundwater
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Sediment and debris deposits:◦ Damaged Headworks area◦ Reduced flow diversion◦ Compromised recharge capacity
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Feb 2010
Average
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Introduction
Project Overview
Conceptual Design – Area 1
Conceptual Design – Area 2
Conceptual Design – Area 3
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Headworks
JPL Parking Lot
Arroyo Intake Structure
Existing Spreading Basins
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Area 1 – Headworks
Area 2 – Diversion Dam & Intake
Area 3 – Spreading Grounds & JPL parking lot
Remove Headworks dam
Naturalize area and restore riparian habitat
Install new restroom
Install recreational & educational facilities
Remove portion of fence
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Construct a new diversion dam
Replace intake trash rack
Install a fine screen to improve aquatic protection
Install educational signage
Remove K-rail & improve road
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Remove JPL Parking Lot (~1000 spaces)
Construct smaller parking lot (~100-150 spaces)
Construct a new access road for JPL employees
Expand spreading basins (from ~13 to 21 acres)
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Introduction
Project Overview
Conceptual Design – Area 1
Conceptual Design – Area 2
Conceptual Design – Area 3
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Headworks Dam5-yr Flood Plain
Water Fountain
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10-yr Flood Plain
50-yr Flood Plain
Ranger Station
Trail
Demolish Headworks Dam Naturalize stream Restroom and drinking
fountain Horse trough Picnic tables Garbage cans Signage Trail
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Picnic Tables
Headworks
Garbage Cans
Islands
Willow Posts
Horse trough
Restroom
Signage
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Nature Trail
Picnic Area
Main Channel (low flow)
High Flow Channel
Planting Islands
Restroom
Naturalization Area
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After 3 yearsAfter 3 months
Las Virgenes Creek, Calabasas
Dec 2007
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Building type◦ Prefabricated◦ Custom build on-site
Size◦ 1 Male/Female stall◦ 2 Male/Female stalls
Disposal method◦ Septic Tank System◦ Composting Toilet
Restroom
Ranger Station
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At restroom:Style: 1 large signTopic: Water quality benefits
In naturalized area:Style: multiple small plates and/or rocksTopics: stream restoration, native vegetation,
dynamic riparian ecosystem
Headworks demolition Stream Restoration Restroom and fountain Horse trough Picnic tables Garbage cans Signage Trail
Introduction
Project Overview
Conceptual Design – Area 1
Conceptual Design – Area 2
Conceptual Design – Area 3
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Bridge No. 3
IntakeDiversion Dam
Former Chlorination
Station
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Diversion Dam Intake Temporary
bridge Road repair Signage
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Signage
New Intake
Temporary Bridge
Road repair
New Diversion Dam
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Bascule gate
Flash Board diversion weir
Obermeyer spillway gate
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Pros Cons
Obermeyerspillway gate
High reliability High capital cost
Ease of operation Sole source availabilityLow Headwater during flood eventsCaptures most water
Bascule gate High reliability High capital cost
Ease of operation
Extreme durability
Low Headwater during flood events
Captures most water
Flash Boards weir
Low capital cost Dangerous to operate during stormLow reliabilityPoor aestheticsPoor control of HeadwaterNo automation
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Abutment Plate
Intake
Sediment deposits
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New Trash Rack
New Fine Screen
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At new dam & intake:Style: small plateTopics: diversion dam operations
aquatic habitat protection
Signage
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New diversion dam New intake Road improvement/
K-rail removal Temporary bridge Signage
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Introduction
Project Overview
Conceptual Design – Area 1
Conceptual Design – Area 2
Conceptual Design – Area 3
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Pipeline from Intake
County Storm Drain
Utilities
Behner WTP
Spreading Basins
JPL Parking Lot
yEquestrian
Pathway
JPL
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New basins with pre-sedimentation
Small recreational parking lot
Access Road Utility relocation New pipes JPL Well Signage
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Signage + Pet Waste StationRoundabout
Equestrian Pathway(existing)
Stairway
Walkway
New Linear Parking
New Access Road
Roundabout
New Spreading Basins
JPL Well
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Linear Parking Lot 10 New Basins:◦ 2 Pre-sedimentation◦ 8 Spreading/Recharge
Pre-sedimentationBasins
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Roundabout
Equestrian Pathway(existing)
Stairway
WalkwayNew
Parking
New Access Road
New Parking
New Spreading Basins
JPL Well
Signage + Pet Waste Station
Parking Lot North End 9 New Basins:◦ 2 Pre-sedimentation◦ 7 Spreading/Recharge
Pre-sedimentationBasins
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66 ft
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ADA Parking
Interpretative Signage
Stairway (Trail Access)
Walkway
New Parking
North Side
Parking for Hahamongna
Watershed Park Visitors
Access via Explorer
Road
New Basins New Access
Rd
South Side
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At the trail head:Style: small plateTopics: spreading basins and groundwater recharge operations, local supply benefits
Signage
Annual saving ~ 1,200 afy x $870/af ~ $1 M/yr Payback Period ~ 5 years
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AreaAnnual
Recharge (af/yr)Existing 2,000
New 1,200Total 3,200
Area Estimate CostArea 1 $900,000Area 2 $1,100,000Area 3 $2,700,000Total $4,700,000
ESTIMATED PROJECT COST ESTIMATED PROJECT YIELD
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New basins with pre-sedimentation
New recreational parking lot Access road Walkway/Stairway Equestrian Trail Pet waste station Signage
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Roundabout
Equestrian Pathway(existing)
Stairway
WalkwayNew
Parking
New Access Road
New Parking
New Spreading Basins
JPL Well
Signage + Pet Waste Station
Pre-sedimentationBasins
