ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)
description
Transcript of ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)
![Page 1: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/1.jpg)
ABALONE COVE LANDSLIDE
ABATEMENT DISTRICT(ACLAD)
Board of Directors Sharon Nolan Mary Sheridan Neil Siegel Emily Vaughan Robert Douglas, ChairmanMgr. Well Operations Daphne ClarkSecretary Sandy Marshall
![Page 2: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/2.jpg)
• Geological Hazard Abatement (GHAD) District– created by the Beverly Act (SB1195) of l979;
ACLAD was the first district formed (1981)• Governed by a Board of Directors (5 persons)
elected from property owners in the District– Assisted by a Secretary and Manager of Well
Operations • ACLAD assesses property owners in the
district to pay for construction and maintenance of abatement measures– Example: Dewatering wells
• GHADs are a means by which homeowners can “help themselves”
ABALONE LANDSLIDE ABATEMENT DISTRICT
(ACLAD)
![Page 3: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/3.jpg)
Abalone Cove Landslide
Altamira ShaleBasalt
SLIDE SURFACE (IMPERMEABLE LAYER)
Rain
GROUNDWATER BUILDUPS WITHIN LANDSLIDE
FRACTURES/FISSURES - CONDUITS FOR INFLITRATING WATER
RESULT:•INCREASE WEIGHT•INCREASE PORE PRESSURE•MOVEMENT
GROUNDWATER AND LANDSLIDES
?
Toe
Head
TRAPPED WATER
![Page 4: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/4.jpg)
Wells added after l985
ACLADDewatering
Wells2006
1980 wells
WW6WW1WW14
WW12WW13
WW11WW8
WW16
WW15
WW17
Abalone CoveLandslide
WW18
WW19
WW9
WW20
WW5
WW2 WW4
WW7
WW10WW3
![Page 5: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/5.jpg)
(Aver. daily production forFebruary and September)
Well Production 1980-2006Aver. Production approx.150,000 gals/day
First wells drilled
Upslope wells added
![Page 6: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/6.jpg)
WW1
WW14
WW12
WW13
WW15
WW16
WW8
WW11
WW17
WW6
WW7
WW3
WW2
WW4WW
9
WW5
WW19
WW18
Abalone Cove Landslide >6,000 gal/day
1-6,000 gal/day
<1,000 gal/day
>20,000 gal/day
![Page 7: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/7.jpg)
ACLADOriginal set of wells
1980-81
Abalone Covelandslide
WW2
WW3
WW5 REDRILL
Major Maintenance
Project
Proposed
Completed
WW1
WW6
![Page 8: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/8.jpg)
Aver=15 in/yr
RAINFALL ANDWELL PRODUCTION
WELL PRODUCTION
RAINFALL
WET YEARS
DRY YEARS
![Page 9: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/9.jpg)
RAINFALL THRESHOLD21-23 in/yr
RAINFALL AND MOVEMENT IN THEABALONE COVE LANDSLIDE
WET YEARS
DRY YEARS
CREEP (mm/yr rate)
ENSO cycles (5-8 yrs)
![Page 10: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/10.jpg)
Highly Developed
Sparsely Developed
INCREASERAINFALL
WITH ELEVATION
40% increase
![Page 11: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/11.jpg)
SUMMARY
• ACLAD Dewatering wells currently pumping ~ 200,000 gals/day; nearly 300 acre-feet water annually
• Since l980, water table elevations have dropped:– 25-60+ feet in Abalone Cove Landslide wells– 8-10 feet in upslope well
• Creep (mm/yr rate) in Abalone Cove Landslide occurs when rainfall totals >~22 inches/year
• Need to rehab older wells and drill new wells in upslope areas
(wet years)
![Page 12: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/12.jpg)
ABALONE COVE LANDSLIDE ABATEMENT DISTRICT
(ACLAD)
1980-2006: TWENTY-SIX YEARS OF
PROGRESS AND SERVICE
• DEWATERING WELLS• GPS MEASUREMENTS
![Page 13: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/13.jpg)
![Page 14: ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD)](https://reader033.fdocuments.in/reader033/viewer/2022061522/568148ec550346895db60891/html5/thumbnails/14.jpg)
ACLADProduction
Wells2006
>6,000 gal/day
1-6,000 gal/day
<1,000 gal/day
WW1
WW14
WW12
WW13
WW15
WW16
WW8
WW11
WW17
WW6
WW7
WW3
WW2 WW4WW9
WW5WW19
WW18
Abalone Cove Landslide
>20,000 gal/day