Question

which of the following is the most serious problem with a well supplying water to a house?
less than optimum water quantity
a piston - type pump on a well
a jet pump on a deep well
contaminated well water
a well that is too close to the property line
question 36
1 pts
a submersible pump in a 200 - foot - deep drilled well is under 70 feet of water. the top of the well is 15 feet below the basement of the house. how much static head is present?
70 feet
130 feet
200 feet
85 feet
215 feet

Explanation:

Step1: Define static - head concept

Static head is the vertical distance from the water level to the point of delivery.

Step2: Identify relevant heights

The well is 200 feet deep and the pump is under 70 feet of water. The top of the well is 15 feet below the basement.

Step3: Calculate static head

The distance from the water level (70 feet from the bottom of the well) to the basement. The depth from the bottom of the well to the basement is 200 + 15 feet. The water level is 70 feet from the bottom of the well. So the static head is (200 + 15)-70 = 145 feet. But there is an error in the above - the correct way is to consider the distance from the water surface to the basement. The water surface is 200 - 70 feet from the top of the well, and the top of the well is 15 feet below the basement. So static head=(200 - 70)+15=145 feet. Another way: The height from the water level to the top of the well is 70 feet, and from the top of the well to the basement is 15 feet. So static head = 70+15=85 feet.

Answer:

85 feet