Water

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Anonymous
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45031
Filename:
Water
Updated:
2010-10-26 02:47:03
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water
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  1. List 4 differences between LID and conventional development?
    • Narrower streets
    • Homes closer to roads
    • More open space
    • Stormwater control is more decentralized
    • Big trees near road
    • Winding roads
    • Use of rain barrels/cisterns
  2. From a water cycle perspective, what is the goal of LID?
    Mimic hydrology of natural, pre-developed area
  3. What does LID stand for?
    Low Impact Development
  4. Why are coastal stormwater regulations more stringent than stormwater regulations in other parts of the state?
    • Shellfish water pollution
    • Proximity to surface waters
  5. What state agency regulates stormwater runoff?
    NC Division of Water Quality
  6. What purpose does the mulch in a rain garden serve?
    • Looks nice
    • Binds pollutants
    • Carbon source for denitrification
    • Soil structure
  7. How much aerated soil between the bottom of a raingarden and the seasonal high water table is required?
    24"
  8. What are the components of a wetpond?
    • Inlet
    • Forebay
    • Berm
    • Aquatic shelf
    • Micropool
    • Outlet
  9. Why aren’t permeable pavements typically used west of I-95?
    Subsoils are slowly permeable
  10. What is rainwater harvesting?
    Process of capturing, storing and using rainwater for non-potable activities - if large enough can reduce runoff.
  11. What are some benefits of riparian buffers other than nutrient load reductions?
    • Stream shading
    • wildlife and aquatic habitat
    • sediment reduction
    • bank stabilization
  12. What N, P and TSS reduction percentage is achieved by wetponds?
    25%, 40%, 85%
  13. What N, P and TSS reduction percentage is achieved by wetlands?
    40%, 40%, 85%
  14. What N, P and TSS reduction percentage is achieved by rain gardens?
    35%, 45%, 85% (RG no IWS);
  15. What are the components of a stormwater wetland?
    • Inlet
    • forebay
    • shallow water
    • shallow land
    • deep pool
    • outlet
  16. What are 5 common stormwater BMPs?
    • Rain gardens
    • Wetponds
    • Stormwater wetlands
    • Permeable pavement
    • Rainwater harvesting
  17. What materials are lagoon liners made of?
    • Clay
    • Bentonite
    • Plastic
  18. List some potential environmental threats related to CAFOs that use anaerobic lagoons
    • Over application of waste,
    • Leaking lagoons
    • Ruptured lagoons
    • Fields with tile drains
    • Volatilization of NH3
  19. Why do silt loam soils have the highest plant available water?
    Pore size distribution- not too small with too much suction, not too large to drain under gravity
  20. Wastewater should be irrigated at rates to maintain soil moisture between ______ and _______.
    • feild capacity
    • wilting point
  21. List 5 things a CAFO operator must keep in his records
    • Permit
    • Waste management plan,
    • Certified Operator-in-Charge,
    • Sludge survey,
    • Calibration of waste equipment,
    • Soil sample analysis,
    • Crop yield records,
    • Stocking and mortality,
    • Daily rainfall,
    • Waste level,
    • Waste Analysis,
    • Waste application records,
    • Weather conditions,
    • Previous inspections
  22. What are the setbacks from a lagoon or swine house to a property boundary?
    500ft
  23. What are the setbacks from a lagoon or swine house to an occupied church?
    2,500 ft
  24. What are the setbacks from a lagoon or swine house to an occupied home?
    1500 ft
  25. What are the storage requirements for a hog waste lagoon

    (what levels are needed beginning with the sludge accumulation to the lagoon berm top?
    • Slude accumulation
    • permanent liquid treatment
    • temporary storage treatment
    • 25-yr, 24-hr storage (5-9”)
    • heavy rainfall factor
    • freeboard (1 ft)
  26. TP
    fecal coliform
    and E. coli?
    • 93 mg/L
    • 3.3 x 106cfu/100 mL
    • 6.9 x 104 cfu/100 mL
  27. What are some typical lagoon wastewater concentrations of BOD?
    287 mg/L
  28. What are some typical lagoon wastewater concentrations of TKN?
    365 mg/L
  29. What are the components of a typical hog waste system?
    • Houses
    • Pipe
    • Lagoon
    • Spray fields
  30. Where are most hog CAFO’s located in the state?
    Eastern NC
  31. What are CAFO’s?
    Confined animal feeding operations
  32. Why isn’t controlled drainage used more in the piedmont?
    too hilly

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