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1. Northwest Water Source
P.O. Box 2766, Friday Harbor, Washington
Office and Home 378-8252
e-mail water@interisland.net
Specializing in water conservation since 1992
Rainfall Catchment
Rainwater Harvesting
A reliable alternative water Source
And stormwater solution

2. New Construction
Rainfall Catchment/Harvesting is approved
for permitting new construction in San
Juan County as a sole source including
potable.
Rainfall Catchment is cost competitive
with conventional water sources.
Water quality from Catchment is often
better than well water in San Juan County.

3. Cost effectiveness
Rainfall Catchment is generally 150% the
cost of conventional well systems.
Rainfall Catchment is generally less than
50% the cost of seawater desalination.
Seawater desalination may only be done
directly from the salt chuck. These
systems be may not connected to
existing seawater contaminated
wells.

4. Environmental Impact
Rainfall catchment has” a net positive
impact on ground water supplies.
Rainfall catchment reduces storm water
runoff from impervious surfaces by storing
the water.
Water impounded is reintroduced to the
aquifer during dry summer months rather
than only during rainy season.

5. Residence of
Andy and Judy
Hengesteg
San Juan Island
The following system has been in
place for 4 years. This system is
the sole residential supply.
14,000 Gallons Storage

6. San Juan Island home using rainwater harvesting as it’s sole water
source. 14,000 gallons of storage located lower than house.
Approximately 3500 square feet of collection area.

7. Can you find the storage tanks in this slide?
6 @ 2340 gallon tanks located on naturally screened pad.

8. Easy to screen, easy to hide storage tanks
14,000 gallons

9. Early Filtration and Ultra Violet disinfection system
Homeowner has also added battery backup and charger on left.

10. 1999 remodel of 4500 square foot home
Potable well system declining in capacity
new metal roof for collection

11. 20,000 gallon steel storage tank with 45 mil poly liner
located 60 feet above home, nearly invisible from home
23 foot diameter X 7 foot wall height

12. 240 Gallon underground “ball” storage tank
with pump to transfer rainwater to storage

13. Screened view from residence

14. 5000 gallon system for irrigation
only ,storage located under deck on opposite side of house.
Shake roof material not approved for potable use.

15. Showing deck with storage below

16. 6000 gallons storage located under pocket deck on opposite side of
house

17. 6000 storage located under second floor
deck on opposite side of house

18. 5000 gallon PVC bladder
located under master bedroom
irrigation for sitting garden

19. Extensive remodel of log home in Victoria Valley
very limited wells with Barium contamination
30,000 gallon steel storage tank located lower than home site
to enable gravity collection. New metal roof system

20. All downspouts connected to 4” PVC manifold.
Manifold drops into 250 gallon filtration tank at lower
corner of deck.
Water gravities 250’ to steel 30,000 gallon storage tank

21. 30,000 gallon storage tank with 45 mil poly liner
pressure system located adjacent to tank
23 feet in diameter X 9 feet wall height

22. Spring Point, Orcas Island
Metal roof system
6000 gallons of storage located in crawl space
Irrigation only

23. 6000 gallons of storage located in crawl space below
deck on right side of house

24. 3 1440 gallon tanks and 1 1100 gallon tank
under guest bedroom

25. Rainfall Catchment Systems
Located on Lopez Island
have been required due to
Salt Water Intrusion

26. Grant/Allen Residence
This residence has a seawater
intruded well that exceeds 250
ppm.
A well drilled on the adjacent
property also exceeds the Chloride
limit.
20,000 Gallons Storage

27. New system presently installed fall of 2000
20,000 gallon steel tank with poly liner
metal roof system

28. All 4 inch PVC collection manifold is located underneath
existing decking.
Collection system is invisible

29. 20,000 Gallon tank located adjacent to home.
Tank filled in less than 3 months.

30. Large collection area will ensure enough for household use
some irrigation will be feasible.
Good source for fire protection

31. 20,000 Tank well screened by trees.

32. Residence of Mark
Gregoire
House well and all neighboring
properties have wells that exceed
the EPA limit for Chlorides.
9000 Gallons Storage

33. Beachfront home on Fisherman’s Bay Peninsula
Cement/clay false “shake” roof system
safe for potable source
salt water intruded well

34. 9000 gallons of storage behind fenced garden

35. Detail of cement/clay roof

36. Details of filtration,disinfection and pumping system

37. Residence located at Mud Bay, Lopez Island
Steel roof system designed to discharge to a single downspout
pump located in culvert tank, pumping 60 feet uphill to remote
storage
9,000 Gallons Storage Capacity

38. Water side of Mud Bay home
storage tanks are not visible from home

39. Mud Bay Home
Remote storage tanks above home site, 9000 gallons
system was required for building permit

40. Molitor home on Shaw Island
Well failed in capacity due to overdraft by
neighbors.

41. 3 2340 gallon tanks under trees barely
visible just to the right of the porch.

42. Fisherman’s Bay Peninsula , Lopez Island
Temporary Mobile Home to be used during construction.
4600 gallons storage behind screen to left.
System required for building permit

43. Fisherman’s Bay Peninsula, Lopez Island
4000 gallons in 4 box tanks located under deck
metal roof system, required for building permit

44. 4000 gallons of storage hidden below deck
Fisherman’s Bay Peninsula, Lopez Island

45. Bakerview, Lopez Island
Modular home installed with 4600 plastic catchment tank
system required for building permit because of salt water intrusion

46. Bakerview, Lopez Island
4600 Plastic water storage tank
bottom set 24 inches below grade

47. Ideal candidate for rainfall catchment system

48. Easy roof to collect water from.

49. Traub Residence, San Juan Island
Well declined and owner installed two 2340
gal tanks

50. Added two more 2340
tanks 6 months later

51. New Residence, San Juan Island 3000 gallons of
storage in crawlspace for fire suppression supply

52. 2@1500 gallon tanks in crawlspace

53. Approved Hydrant outside corner of house nearest
driveway for access.

54. Borner residence, Shaw Island
20,000 gallon rainfall catchment system

55. 20,000 Gallon Storage Tank

56. Pump, Filtration and Disinfections in insulated
locker.

57. Johnson Home
New construction, San Juan Island Saltwater intruded well.
9,000 gallons storage under new deck

58. Finished Home

59. 9,000 gallons of storage installed before
construction under future deck.

60. Tanks enclosed within Deck. Screened from view.

61. County Commissioner Millers Strawbale home, Lopez
Island. Rainfall Catchment, Composting toilet,
Greywater Greenhouse.

62. Greywater Greenhouse
Miller residence, Lopez Island

63. Greywater Greenhouse
viewed from inside living room

64. Savage/Wooten residence, Shaw Island
Dual system potable from well
all other water from rainfall catchment

65. Collection tank with pump to transfer to
storage tanks, remote on property.

66. 8,400 gallons rainfall storage
600 feet from house

67. Potable and non-potable pumps
tank on left is storage for potable well

68. Lopez School
Lopez School has been supplied from a distant well for
several years. Due to concern with Salt Water
Intrusion,
Northwest Water Source is designing a rainfall
catchment system for total use of the school complex.
Washington State Department of Health will allow the
design if treatment meets drinking water standards.
There will be a 120,000 gallon raw water tank located
elsewhere on the property. Filtration will be by “Bag
Filters”, with both Ultra Violet and Chlorination for
disinfections. School buildings will produce over 1.5
million gallons per year.

69. Lopez School

70. Huge Collection Area

71. New Home, Rosario
Catchment required due to moratorium on water
connections

72. Factory built house, Raster block foundation, pannelized
structure and roof. 4 2340 gallon tanks on right.

73. Another new home on Orcas Island, Moratorium
on community system. Building permit issued
based on rainfall catchment.

74. 4 2340 gallon tanks located at back of
building against setback for property line.

75. Home on Shaw Island
Flat Torchdown roof, built in downspouts
Raincoat 2000 NSF approved potable coating.
Bob Tremble, Shaw Island, Flat Roof

76. Bob Trimble and Jim Reuscher inspecting new roof
coating.

77. North View of Trimble roof.
“Raincoat 2000” potable coating system

78. Restoration of historic Anderson cabin, Orcas
Island. No well, existing catchment system
rebuild system and install 10,000 gallon tank

79. Nice little 10,000 gallon tank tucked in
the trees.

80. Very nice lady with more garden than water, Orcas Is.
Collection system with over 1000 feet of collection pipe
50,000 tank located at base of cliff below house.

81. 50,000 gallon tank at bottom of cliff

82. Martin home on Lopez Island
20,000 gallon tank to be located 100 feet above

83. Installation of underground pipe

84. Installation of 240 in-ground ball tank to collect water from rooftop
and house deep well pump to shuttle water to 20,000 tank above
house

85. Construction of steel tank
Foundation of crushed rock and compacted sand
with cement pavers for support of steel tank

90. Liner Installation. All Fittings through floor

92. San Juan Island Fire
Dist. 3
San Juan Island Fire District #3 is
building a new 9000 sq.ft.
firehouse. They have an excellent
well, but have decided to fill their
new 30,000 gallon water storage
tank from rainfall catchment. The
storage tank if for fire truck water
supply and building sprinkler
system.

93. New 9000 sq.ft. firehouse with
storage tank located behind
building.

94. District #3 firehouse view from
south.

95. 30,000 gallon tank, Fire Dist #3

96. Existing house, Port Stanley, Lopez
Island due for remodel summer 2002.
Well has been contaminated with sea
water. Will do metal roof and
catchment.

97. Rainfall Information
You may use the average rainfall
for selected locations in San Juan
County to complete the above
worksheet. Average water use
per person/per day is 50 to 60
gallons. There is no allowance
for irrigation which is generally
not recommended .

98. Rainfall Catchment
Water Budget
You may use this worksheet to
estimate storage and catchment
area requirements to suit your
needs

99. Rainfall Catchment Water Budget for Feasibility
Number of Users 2
Gallons per day/person 50
Supplement from well 0
STEP 1 Gallons required per day 100 (users x gpd/p =)
Days in residence/year 365
STEP 2 Total water use per year 36500 (gpd x days =)
Rainfall 22
Water per sq.ft./inch of rain 0.623
STEP 3 Gallons water/sq.ft./year 13.706 (rainfall x .623 =)
Total water needed per year 36500
Gallons water/sq.ft./year 13.706
STEP 4 sq.ft.collection area needed 2663 (water needed/gpsqft =)
Days storage required 90
Gallons required per day 100
STEP 5 Gallons of storage required 9000 (days stg x gpd =)
System requirements for the above system are as follows
Rooftop catchment collection area required for this design based on rainfall in
the surrounding neighborhood
REQUIRED 2663 sq.ft.
Storage capacity required to supply system for periods without rain (summer)
REQUIRED 9000 gallons
ROOF TOP COLLECTION AREA Sq. Ft.
Main House 2700
Studio
Garage
TOTAL COLLECTION AREA PROVIDED 2700
TOTAL WATER AVAILABLE ANNUALLY 37006
TOTAL WATER STORAGE REQUIRED 9000

100. Average rainfall at selected locations in San Juan County
All roofing material to be enameled metal or other approved impervious surface.
Average Rainfall by location
South Lopez 15"/yr
South San Juan 18/yr
Fisherman's Bay 20"/yr
Friday Harbor 22"/yr
Central San Juan, North Lopez 24"/yr
Shaw, Henry, Crane 26"/yr
Roche Harbor, Orcas Landing 27"/yr
Deer Harbor, West Sound, West Orcas 28"/yr
Eastsound, Buck Mt., N.W. Orcas, Waldron 29"/yr
Olga, Pt. Lawrence, Obstruction Is. 32"/yr
Northshore Orcas, Mt Constitution, Twin Lakes 35"/yr
Northwest Water Source dba Greywater Management, Inc. Friday Harbor, Wash
P.O. Box 2766, 378-8900, fax 378-8790……….e-mail..water@waterstore.com
Directions for use of this work sheet.
Choose the average rainfall from the listing at the bottom of page one
adjust the variables (red figures above) for your conditions
note requirements (blue figures above) to size your system
insert planned structures (green figures above) to determine whether the proposed structure
is of adequate size to supply required water. Don"t downsize storage required if you have
more than adequate roof footprint.
roof pitch has no bearing on catchment area except in areas of high wind during storms.
All math formulas are already in this worksheet. If you change the variables, the required totals will
automatically change with them. If you have any questions, Call Tim Pope at 360-378-8900 or evenings a
360-378-8252. Happy water prospecting!

101. Documents required by San
Juan
County, Washington for
building permit for new home
using Rainwater Harvesting
as a sole source including
Potable.

102. OUR OFFICE

103. Thank You.
Tim Pope, Northwest Water
Source
P.O.Box 2766, Friday Harbor, WA 98250
360-378-8900 – fax 360-378-8790 – home 360-378-8252
e-mail water@waterstore.com