**Calculate width by using time speed and the method you use will depend on what information you already have.Calculate speed, distance or time using the formula d = st,.**

To solve for distance use the formula for distance d = st, or distance equals speed times time.

*distance = speed x time*

Rate and speed are similar since they both represent some distance per unit time like miles per hour or kilometers per hour. If rate *r* is the same as speed *s*, r = s = d/t. You can use the equivalent formula d = rt which means distance equals rate times time.

*distance = rate x time*

To solve for speed or rate use the formula for speed, s = d/t which means speed equals distance divided by time.

*speed = distance/time*

To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.

*time = distance/speed*

*To find the width, multiply the length that you have been given by 2, and subtract the result from the perimeter. You now have the total length for the remaining 2 sides. This number divided by 2 is the width.*

FORMULAS FOR POOL CAPACITY

L = length W = width V = volume D = depth

r = radius (half of the diameter of a circle)

π = (pi) 3.14 (a factor used in calculations with circles)

SURFACE AREA

Rectangular pool = L x W

Circular pool = r² x π

Right triangle = (L x W) ÷ 2

AVERAGE DEPTH

For constant slope: [D (minimum) + D (maximum)] ÷ 2 = AVERAGE DEPTH

Note: For multi-depth pools calculate the volume in sections of constant slope and

add them together.

CUBIC FEET OF VOLUME (surface area times average depth)

Rectangular pool V = L x W x D

Circular pool V = r² x π x D

POOL GALLONAGE IN CUBIC FEET (cubic foot of water = 7.5 gallons)

Rectangular pool gallons = L x W x D x 7.5

Circular pool gallons = r² x π x D x 7.5

FLOW RATE/TURNOVER RATES

SPAS: Required turnover every 30 minutes therefore required flow rate is:

Gallons ÷ 30 minutes = minimum (min) flow rate in gallons per minute (gpm)

LIMITED USE POOLS: Required turnover at least every 8 hours (8 x 60 min = 480 min)

Gallons ÷ 480 minutes = min flow rate in gpm

alculating the average speed is simple using the formula {\displaystyle {\text{speed}}={\frac {\text{distance}}{\text{time}}}}. But sometimes you are given two different speeds used for some periods of time, or over some distances. In these instances, other formulas exist for calculating the average speed