The same way you read any other curve on a Cartesian plane: locate a particular point on the curve and its x/y coordinates (i.e.) price and quantity).
What does car tend to do when rounding a curve? Read more:
a System curve is used in hydrolic anylyses to dtermine the duty point of a pump for a certain pipe line. The pump curve and system curve are plotted on the same graph and where the two cross each other is the duty point, the curve is a Head(meters) vs Flow(m3/hour). The system curve Head = static head + head loss due to friction in pipe + secondary head loss *This is calculated for a certain flow to determine the Head so it can be plotted on the curve
Because it's Broken
The horsepower of the motor is based on the efficiency curve of the pump it is to drive. The higher the head pressure of the pump the more HP it is going to require to drive it. Look up the pump model on line and look for its characteristics curve. there it should tell you the HP you will need for a specific flow.
What type of pump is it? If it is a metering pump, it's likely you have to provide a pressure sustaining valve on the discharge side to stop the siphoning effect. If it is a centrifugal pump, the pump may provide more head than required. This would make the pump curve too high. The high flow rate at this head would cause damage to the pump, so it may be the case the pump has some kind of safety shut off. Throttling produces more frictional losses, pushing the system curve higher. The flow rate at this level is healthy.
You *don't* read the line where the fluid meets the glass. You look past it, to the middle of the downward curve in the fluid, the "meniscus" and read from that.
Read this http://www.pitt.edu/~mgahagan/Definitions/SupplyandDemand.pdf very helpful.
read a book
The official site provide a PDF for proving its effectiveness, but to be very true a normal user can't get what the PDF is about, or what the study is been explained. You can actually read Total Curve reviews here on Consumer Health Digest
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1.read the bottom of the curve 2. you must read the meniscus at eye level