Cistern Maintenance. Portsmouth Island, NC life saving station. Stormwater BMP Maintenance & Inspection
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1 Cistern Maintenance Portsmouth Island, NC life saving station
2 Bodie Island Light House
3
4 Old Salem, NC 1780
5 Sierra Nevada Mills River NC
6 Why A Cistern Cisterns store rain water Rain water can be used for any nonpotable use such as irrigation, vehicle washing, toilet flushing Saves potable water Stored water does not contribute to runoff Reduces stormwater footprint
7 Cistern water is non-potable unless it is treated We Bring Engineering to Life
8 Kitty Hawk, NC Over 6000 gallons of storage for one house We Bring Engineering to Life
9 We Bring Engineering to Life
10 Cisterns come in all shapes and sizes
11 Durham Rain Catchers
12
13
14 Terminolgy Detention / Active or Passive Release Used to mitigate peak flow and provide nonpotable water Single-Purpose Used to provide non-potable water
15 Passive Release Concept Credit: Phil R
16 Detention Retention Detention volume = 600 gal (~1.1 ) Retention volume = 6,000 gal Drawdown time = 3 days
17 Passive Release Conclusions: Function Significant potential for meeting stormwater management regulations Easy to retrofit existing systems Maintenance free (OK, very light maintenance) Coincides well with existing North Carolina stormwater regulations
18 Detention/Active Release Computer controlled Prepare the rainwater harvesting system for a forecasted precipitation event by releasing water prior to the event, thus ensuring there is enough space available to accept the predicted rainfall amount.
19 Pilot System: NC State Advanced Rainwater Harvesting
20 Single-Purpose Collects water from rooftops only and is used for household use. Small outlet at bottom for plumbing connection and large overflow pipe at top for bypass of large flows
21 Single-Purpose
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23 Cleveland Water Pollution Control - 15,000 gallons
24 Algae & Cisterns Clear or Translucent Cisterns Could Spawn Algae Growth Algae Need Sunlight SOLUTION: If Outside, use Black or Green Cistern We Bring Engineering to Life
25 Stinky Cistern Water A rotten egg odor or sulphur odor in water can be from dissolved hydrogen sulfide gas or certain bacteria in your water A sulfurous smell or rotten egg smell may also be due to the combination of loss of oxygen in water (hypoxia), or low oxygen levels, combined with algae which feeds and then dies
26 Shock Chlorination Use 32 fluid oz unscented chlorine bleach (5.25% chlorine) per 1000 gallons of water (=10 ppm chlorine) Can go as high as 50 ppm Contact time 24 hours Maintenance Chlorination (2-5 ppm) = 6.5 oz bleach per 1000 gallons
27 Mosquitoes & Cisterns Popular Fear: Mosquitoes Breed in Cisterns Manufacturers have developed well plumbed devices. Screens keep mosquitoes out We Bring Engineering to Life
28 Pumps We use Leader Pumps Divertron 120v - gives 25psi Have pumps professionally inspected every 2-3 years Submersibles are good Clean intakes or use floating intakes Bury tank 1-2 feet if freezing is an issue
29 Gutters Is water getting to the system?
30 Why is my cistern water brown? Tannic Acid.
31 Why is my cistern DRY???
32 Check Inlet Screens Keep gutter debris out Keep rodents and reptiles out of cistern Is High better than Low?
33 High
34 High out of sight, out of mind
35 Low (and easy)
36 Diverter Screen
37 First flush diverter & screen
38 Sediment Clean sediment if > 8 inches Measure sediment with ruler May require professional cleaner vactruck, confined space Consider quality of sediment directly related to roof covering
39 Zinc from galvanized roof
40 Cu from copper roof
41 See our publication for details
42 Trim or Clear Overhanging Lowers debris loading of roof and gutters Eliminates roosting points for birds Eliminates access points for rodents (rats and squirrels) Branches
43 Check Hatches and Covers Check fit and seal to prevent child and insect access
44 Protect fittings from freezing
45 Cistern Use Major problem with cisterns is lack of use Not convenient Plumbing code issues Anti-LID attitudes Examples of well-used cisterns.
46 Boone Public Works Cistern
47 Case Study: Town of Boone, NC 2800 ft 2 of rooftop 5,000 gal cistern Public Works Facility Water use: streetsweeping, sidewalk washing, brine solution for snow/ice removal, equipment washing, irrigation of flower beds and median strips Cost - $4,000
48
49 Mountain Welcome Center 28,000 gallons toilet flushing
50 Metering Water Use You may have to pay sewer charges
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