APPENDIX A
Formulas For Water Supply Problems
USE OF FORMULAS TO SOLVE PROBLEMS
This appendix gives formulas for use in solving water supply problems often found in the field. Each formula is accompanied by a problem solved by using the formula.
CONVERSION OF VOLUME TO WEIGHT OF WATER
The formula and a problem for conversion of volume to weight of water are given below.
b. Illustrative Problem. What is the weight of water in a full tank with a volume of 470 cubic feet?
CONVERSION OF VERTICAL FEET OF WATER TO POUNDS PER SQUARE INCH
The formula and a problem for conversion of vertical feet of water to pounds per square inch given below.
b. Illustrative Problem. What is the pressure in pounds per square inch at the bottom of a storage tank with 25 vertical feet of water?
CONVERSION OF POUNDS PER SQUARE INCH TO VERTICAL FEET OF WATER
The formula and a problem for conversion of pounds per square inch to vertical feet of water are given below.
b. Illustrative Problem. How many vertical feet of water are in a tank that is 45 feet high? A pressure gauge at the bottom of the tank reads 9 pounds per square inch.
CONVERSION OF VOLUME TO GALLONS OF WATER
The formula and a problem for conversion of volume to gallons of water are given below.
b. Illustrative Problem. How many gallons of water are in a tank with 400 cubic feet of water?
CONVERSION OF GALLONS OF WATER TO CUBIC FEET
The formula and a problem for conversion of water to cubic feet are given below.
b. Illustrative Problem. How many cubic feet of tank space are needed to store 1,500 gallons of water?
CALCULATION OF VOLUME OF WATER TANKS
The formula and two problems for calculation of volume of water tanks are given below.
a. Formula for Rectangular Tank
b. Formula for Cylindrical Tank.
c. Illustrative Problems. What is the volume of a rectangular tank that is 10 feet long, 7 feet wide, and 4 feet high?
What is the volume of a cylindrical tank that has a radius of 4 feet and is 7 feet high?
CALCULATION OF QUANTITY OF WATER FLOWING IN A STREAM
The formula and a problem for calculation of quantity of water flowing in a stream are given below.
b. Illustrative Problem. A stream has an average depth of 2 feet and a width of 16 feet. A twig floats 13.3 feet per minute. How many gallons per minute are flowing in the stream?
CALCULATION OF POUNDS OF CHLORINE
The formula and a problem for calculation of pounds of chlorine are given below.
b. Illustrative Problem. If eight parts per million of chlorine are required for 3,000 gallons of water, how many pounds of chlorine will be needed?
CALCULATION OF GALLONS OF WATER THAT CAN BE TREATED WITH A GIVEN SUPPLY OF CHLORINE
The formula and a problem for calculation of gallons of water that can be treated with a given supply of chlorine are given below.
b. Illustrative Problem. There are 4.15 pounds of chlorine on hand. The operator is using five parts per million of chlorine as the average treatment dosage. How many gallons of water can the operator treat before running out of chlorine?
CALCULATION OF THE PARTS PER MILLION OF CHLORINE PRESENT IN A TREATMENT TANK
The formula and a problem for calculation of parts per million of chlorine present in a treatment tank are given below.
b. Illustrative Problem. If 16.6 pounds of chlorine are added to 20,000 gallons of water, how many parts per million of chlorine are present?
CONVERSION OF POUNDS OF CHLORINE TO OUNCES OF CALCIUM HYPOCHLORITE
The formula and a problem for conversion of pounds of chlorine to ounces of calcium hypochlorite are given below.
b. Illustrative Problem. If 1/2 pound of chlorine will be needed to treat a water source, how many ounces of calcium hypochlorite will be required?
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