00/SUSTAINABILITY/ Storm Water Management Questions 100% Correct!!
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00/SUSTAINABILITY/ Storm Water Management
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00/SUSTAINABILITY/ Storm Water Management
What problems arise from improper water control during and after construction? - ANSWERIncreased load on local storm sewer systems
Increased potential for flooding
Pollution of waterways
Erosion of sites, waterways, stream banks
Accelerated soil creep or landslides
Stream arming
Loss of aquat...
00/SUSTAINABILITY/ Storm Water
Management Questions 100% Correct!!
What problems arise from improper water control during and after construction? -
ANSWERIncreased load on local storm sewer systems
Increased potential for flooding
Pollution of waterways
Erosion of sites, waterways, stream banks
Accelerated soil creep or landslides
Stream arming
Loss of aquatic biodiversity
Eutrophication - ANSWERThe normally slow aging process by which a lake evolves into a bog or
marsh and ultimately assumes a completely terrestrial state and disappears. During eutrophication
the lake becomes so rich in nutritive compounds, especially nitrogen and phosphorus, that algae and
other microscopic plant life become superabundant, thereby "choking" the lake, and causing it
eventually to dry up. Eutrophication may be accelerated by human activities.
Stormwater Management - ANSWERThe use of structural and nonstructural practices designed to
reduce stormwater runoff pollutant loads, discharge volumes, and peak flow discharge rates.
Ways to control erosion during construction - ANSWERsilt fences
sediment traps or basins
vegetated buffer strips
hay bales
Ways to control stormwater at building site - ANSWERminimize impervious coverage of development
utilize the natural filtration and cleansing action of soils and plants
capture and control excessive runoff
Use pervious paving, develop construct wetlands build grass-lined swales.
Pervious paving - ANSWERmanufactured grids of concrete, plastic, or other materials that allow grass
or other ground covers to grow through
, porous asphalt or concrete
1 inch of rain per square foot of roof area - ANSWER0.6 gallons of water
Rainwater Collection System - ANSWERWater collection system (often a roof), a storage cistern,
water distribution system. If using roof, use materials to avoid contamination/addition of sediment
(metal, clay, concrete tile not asphalt shingles, lead-containing materials such as flashing). Devices
can divert first flush of water during waterfall to prevent it from entering cistern. Must be allowed by
local/state regulations and amount of rainwater must be sufficient for collection. Poor air quality may
yield water not suitable for collection.
Drainage Easement - ANSWERLegal right granted by a landowner to a grantee, commonly a
governmental entity, allowing the use of private land for stormwater management.
Fee in lieu - ANSWERpayment of money by a developer in place of meeting all or part of the
stormwater performance standards.
Hydrologic soil group (HSG) - ANSWERA classification system developed by the Natural Resource
Conservation Service in which soils are categorized into *four runoff potential groups.* These groups
range from A soils, with high permeability and little runoff production, to D soils, which have a high
runoff potential.
Infiltration - ANSWERprocess of percolating stormwater into the subsoil
Watercourse - ANSWERany body of water including, but not limited to, lakes, ponds, rivers, and
streams
Waterway - ANSWERa channel that directs surface runoff to a watercourse or to a public storm drain.
How do you calculate amount of rainwater available for a rainwater collection system -
ANSWERHorizontal area of catchment area multiplied by the average annual rainfall for a region
reduced by some amount. Typically 75% to account for evaporation and other losses.
Role of landscaping in sustainable site development - ANSWERUse native plants and minimize high-
maintenance lawns.
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