Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Land Development
| Question | Answer |
|---|---|
| Soil Erosion | Detachment and transport or sediment particles caused by wind, rain, ice, and gravity |
| What do erosion rates directly compare to? | The percentage of bare soil on a site |
| Sedimentation | The deposition of soil particles |
| What are problems arising from construction related activities? | Degradation to downstream properties and waterways. Damage to new and existing infrastructure. Dust and mud tracked onto public streets. |
| When is an E&SC Plan Needed? | Land disturbing activities > 10,000 ft&2 Legally enforced by localities with legislative backing (fines, bonds) |
| What is a E&SC plan? | Used to show the location and size of the various E&SC practices |
| What are the phases of the E&SC plan? | Phase I: Initial Planning Phase II: Finish grading and protection of site infrastructure |
| What is a E&SC Narrative? | Provides supporting calculations, includes information often redundant to feasibility report |
| What are factors that influence soil erosion? | Rainfall frequency and distribution type, soil properties, topography, vegetation |
| What are the classes of sediment control measures? | Filtering, Prevention, Colleciton |
| What are filtering measures? | Silt fence, straw bales, inlet protection |
| What are prevention measures? | Construction entrances, slope drains, outlet protection, check dams, level spreaders, seeding |
| What are collection measures? | Diversion dikes, sediment traps, sediment basins |
| What are diversion dikes? | Used to direct flow away from vulnerable areas and into stabilized traps, basins, or channels |
| What is a hydrograph? | a plot of discharge versus time |
| What is a hyetograph? | a plot of rainfall intensity versus time |
| What is duration? | how long the storm event lasts |
| What is rain intensity? | the rate of rainfall in in/hr |
| What is return frequency? | The average time between events of the same volume and duration |
| What is the exceedance probability? | The probability that a storm of specified volume and duration will be observed or exceeded in a given year |
| What is the rational method? | Drainage basins <200 acres, computes peak discharge, not a full hydrograph. Q=CiA |
| What is NRCS TR-55? | It is used to compute a full hydrograph, used for detention basin size estimation |
| What is the runoff coefficient? | C is a factor between 0 and 1, indicating the fraction |
| What is time of concentration? | The time it takes the most hydraulically remote point in a watershed to contribute runoff to the point or analysis |
| What is the drainage area? | The total acreage draining to a point of interest is delineated by examining topography and the presence of manmade infrastructure |
| What are the three types of flow regimes? | Overland Flow, Shallow Concentrated Flow, Channel Flow |
| What is overland flow? | Occurs over planar surfaces. Usually observed at the headwater of a given watershed. Restricted to 100 to 300 feet. |
| What is shallow concentrated flow? | Occurs after sheet flow begins to accumulate enough depth and velocity to begin creating small flow channels |
| What is concentrated flow/channel flow? | Occurs when there is a well defined conveyance channel. Use manning's equation. |
| What is a contour? | a line connecting points of equal elevation above some datum |
| What is a contour interval? | The vertical elevation difference between adjacent contour lines |
| What is a TIN? | Triangulated Irregular Network. Surface model comprised of triangles. |
| What are breaklines? | Linear surface features depicting an abrupt change in elevation |
| Who regulates drinking water systems? | The Virginia Department of Health |
| What influences average daily consumption? | Land-use and population |
| What dictates Overall peak system requirements? | Fire Flow |
| What are minor losses in pipes? | losses from valves, hydrants |
| What is the typically pressure range in pipes? | 20 psi to 80 psi |
| What is the most common material used in water supply pipes | Ductile Iron Pipe |
| What is the typical range in diameter for water supply pipes? | 6" to 20" |
| What are the most common joints in a water supply system? | Push on and mechanical joints |
| What are the three types of valves in a water supply system? | Butterfly & Gate, Blowoff, Air Release |
| What are blowoff valves? | Used to dewater lines for repairs and maintenance. Located at low points and ends of branches |
| What is an air release valve? | Located at the high point of a water line to dissociate the air from the water |
| Who regulates sanitary sewer requirements? | Virginia Department of Environmental Quality |
| What is a sewer? | A conduit for conveying wasterwater |
| What is a lateral? | the conduit connecting an individual building to a main sewer |
| How much of a sewerage is comprised of water? | 99% |
| What parameters define sewerage strength? | Biological Oxygen Demand, Composition of Suspended Solids |
| What is BOD? | Biological Oxygen Demand is the measure of the amount of organic matter present |
| What makes up suspended solids? | 80% organic matter including fecal matter, washwater particulates, kitchen waste |
| What dictates wastewater system design flows? | Population and land use |
| What are the required separations from drinking water lines to wastewater lines? | 10' horizontal and 18" vertical |
| What is the most common sewer pipe SDR? | SDR-35 |
| What is SDR? | The standard dimension ratio. Ratio of the external pipe diameter to wall thickness |
| What is the most common material for waste water pipes? | PVC Pipe |
| What is a manhole? | Provides an access point for inspection of the sewer system |
| Where must a manhole be placed? | Terminal end of a line, every change in alignment, change in diameter, junctions |
| What is the minimum flow velocity in a wastewater pipe? | 2 fps to prevent deposition |
| What is the minimum pipe diameter for wasterwater pipes? | 8" but can less when fewer than 6 lots are served on a cul de sac. |
Created by:
811015421
Popular Engineering sets