A condition where surface waters warm rapidly, expand, and become
lighter
than the lower, colder waters is called?
Thermal stratification
What are the three major water quality indicators that effect the
efficiency of
copper sulfate as an algicide?
Alkalinity, algae species, and outdoor temperature
According to the SDWA, a Public Water System is one that:
Has at least 15 service connections and serves an average of 25 people daily for at least 60 days per year
Items essential to a sanitary survey include identification of potential hazards, the determination of factors that affect water quality and which other condition?
•The amount of process waste products
•The demand of the finished water product
•Hiring of qualified operators
•The selection of treatment requirements
If a lake has a surface area of 5 acres, what is the surface area as square feet?
217,800 sq ft
Convert 9,785,500 cubic feet to gallons
73,195,540 gallons
Aeration and Re-aeration are methods of what?
Reservoir destratification
A disagreeable rotten egg odor noticed in a groundwater source is caused by what?
Hydrogen sulfide
How many Nephelometric Turbidity Units (NTU) will produce a water that is usually objectionable for aesthetic reasons?
5.0 NTU
Soft water, turbidity, suspended solids and microbial contamination are characteristics of what raw water source?
Surface water
Increases and decreases of a lake or reservoir pH during daylight hours are caused by what?
Photosynthesis
What Act was signed into law on December 16, 1974?
The Safe Drinking Water Act (SDWA)
What is the most common primary algicide used in domestic water reservoirs?
Copper sulfate pentahydrate
What is an advantage of single-level intake structures?
They are less costly to operate and maintain
There are three basic rights to the use of water. Riparian and Prescriptive are two of the rights to the use of water, what is the third?
Appropriative
Who should conduct a new water supply sanitary survey?
Persons trained in public health engineering
Objectionable tastes and odors, shortened filter runs, fluctuating pH, dissolved oxygen depletion are all attributed to what?
Aquatic algal blooms