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ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD) Board of Directors Sharon Nolan Mary Sheridan Neil Siegel Emily Vaughan Robert Douglas, Chairman Mgr.

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Presentation on theme: "ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD) Board of Directors Sharon Nolan Mary Sheridan Neil Siegel Emily Vaughan Robert Douglas, Chairman Mgr."— Presentation transcript:

1 ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD) Board of Directors Sharon Nolan Mary Sheridan Neil Siegel Emily Vaughan Robert Douglas, Chairman Mgr. Well Operations Daphne Clark Secretary Sandy Marshall

2 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)

3 Abalone Cove Landslide Altamira Shale Basalt 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

4 Wells added after l985 ACLAD Dewatering Wells wells WW6 WW1 WW14 WW12 WW13 WW11 WW8 WW16 WW15 WW17 Abalone Cove Landslide WW18 WW19 WW9 WW20 WW5 WW2 WW4 WW7 WW10 WW3

5 (Aver. daily production for February and September) Well Production Aver. Production approx.150,000 gals/day First wells drilled Upslope wells added

6 WW1 WW14 WW12 WW13 WW15 WW16 WW8 WW11 WW17 WW6 WW7 WW3 WW2 WW4 WW9 WW5 WW19 WW18 Abalone Cove Landslide >6,000 gal/day 1-6,000 gal/day <1,000 gal/day >20,000 gal/day

7 ACLAD Original set of wells Abalone Cove landslide WW2 WW3 WW5 REDRILL Major Maintenance Project Proposed Completed WW1 WW6

8 Aver=15 in/yr RAINFALL AND WELL PRODUCTION WELL PRODUCTION RAINFALL WET YEARS DRY YEARS

9 RAINFALL THRESHOLD in/yr RAINFALL AND MOVEMENT IN THE ABALONE COVE LANDSLIDE WET YEARS DRY YEARS CREEP (mm/yr rate) ENSO cycles (5-8 yrs)

10 Highly Developed Sparsely Developed INCREASE RAINFALL WITH ELEVATION 40% increase

11 SUMMARY ACLAD Dewatering wells currently pumping ~ 200,000 gals/day; nearly 300 acre-feet water annually Since l980, water table elevations have dropped: – 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)

12 ABALONE COVE LANDSLIDE ABATEMENT DISTRICT (ACLAD) : TWENTY-SIX YEARS OF PROGRESS AND SERVICE DEWATERING WELLS GPS MEASUREMENTS

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14 ACLAD Production Wells 2006 >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 WW4 WW9 WW5 WW19 WW18 Abalone Cove Landslide >20,000 gal/day


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