Conducting a Quick Storage Estimate

00:03

once the basic shape of a pond has been defined,

00:06

the next task is to conduct a quick storage

00:08

estimate to obtain an approximate value for the volume.

00:13

This is then refined by simulating the network with a series of design storms

00:19

with a model open in the plan view in the results

00:22

tab click in flow summary and scroll to the bottom.

00:27

Note that the area to be analyzed is 2.5-1 hectares.

00:32

Keep that last value in mind as it will play

00:35

a critical role in setting the size of the pond.

00:37

Close the dialog

00:40

in the plan view double click the pond icon and open the sizing calculator.

00:46

Set the method. Drop down to quick storage estimate

00:49

and set the design up to drop down to free board.

00:53

You have the option to manually enter a

00:55

volume but instead click the calculator icon.

00:60

This opens a dialogue where you can input several values

01:04

set,

01:05

the input type drop down to user input and the area

01:09

field to 2.5 to the 2.5 to 1 hectares being analyzed,

01:15

rounded down

01:17

In the volumetric runoff coefficient field, enter a value of 0.750.

01:24

This means that during a rainfall event,

01:30

into the drainage system and eventually into the pond,

01:35

Enter a discharge rate of 16.1 which was

01:37

calculated earlier from the Green Field Runoff.

01:41

You can also enter a value for the ponds infiltration rate

01:45

or how much water will go into the ground through the walls of the pond.

01:50

In this case assume that the pond lining is Impenetrable

01:53

and do not enter a value.

01:56

The safety factor in this example is set to

02:04

expand the drop down below it and set it too quick.

02:08

Next

02:09

make sure the srp wizard F S R option is enabled,

02:14

click calculate to view the results.

02:17

The quick storage estimate for this pond is somewhere in the range of 705 and 997 m3.

02:25

Keep in mind these values are only estimates and

02:28

should not be used for final design purposes.

02:32

Click OK.

02:34

The sizing calculator now displays a volume of 850.796 m3 which is

02:40

the middle of the estimated volume range from the quick storage estimate.

02:44

Keep in mind that a full simulation will be required to confirm

02:47

the actual volume but this is a good approximation for now.

02:51

Click OK

02:53

notice that the ponds dimensions change slightly in the preview area of the pond.

02:57

Dialogue

02:59

click OK.

03:01

In the plan view you can see the

03:02

pond's appearance changed to reflect its new measurements.

03:06

In this example, the pond displays a blue line,

03:11

this is a layer of imported cad data that

03:13

gave an outline of the pond's initial shape and size

03:17

since it is no longer relevant,

03:19

click the box next to the pond outline dot D W G node in the tree view to deactivate it

Video transcript

00:03

once the basic shape of a pond has been defined,

00:06

the next task is to conduct a quick storage

00:08

estimate to obtain an approximate value for the volume.

00:13

This is then refined by simulating the network with a series of design storms

00:19

with a model open in the plan view in the results

00:22

tab click in flow summary and scroll to the bottom.

00:27

Note that the area to be analyzed is 2.5-1 hectares.

00:32

Keep that last value in mind as it will play

00:35

a critical role in setting the size of the pond.

00:37

Close the dialog

00:40

in the plan view double click the pond icon and open the sizing calculator.

00:46

Set the method. Drop down to quick storage estimate

00:49

and set the design up to drop down to free board.

00:53

You have the option to manually enter a

00:55

volume but instead click the calculator icon.

00:60

This opens a dialogue where you can input several values

01:04

set,

01:05

the input type drop down to user input and the area

01:09

field to 2.5 to the 2.5 to 1 hectares being analyzed,

01:15

rounded down

01:17

In the volumetric runoff coefficient field, enter a value of 0.750.

01:24

This means that during a rainfall event,

01:30

into the drainage system and eventually into the pond,

01:35

Enter a discharge rate of 16.1 which was

01:37

calculated earlier from the Green Field Runoff.

01:41

You can also enter a value for the ponds infiltration rate

01:45

or how much water will go into the ground through the walls of the pond.

01:50

In this case assume that the pond lining is Impenetrable

01:53

and do not enter a value.

01:56

The safety factor in this example is set to

02:04

expand the drop down below it and set it too quick.

02:08

Next

02:09

make sure the srp wizard F S R option is enabled,

02:14

click calculate to view the results.

02:17

The quick storage estimate for this pond is somewhere in the range of 705 and 997 m3.

02:25

Keep in mind these values are only estimates and

02:28

should not be used for final design purposes.

02:32

Click OK.

02:34

The sizing calculator now displays a volume of 850.796 m3 which is

02:40

the middle of the estimated volume range from the quick storage estimate.

02:44

Keep in mind that a full simulation will be required to confirm

02:47

the actual volume but this is a good approximation for now.

02:51

Click OK

02:53

notice that the ponds dimensions change slightly in the preview area of the pond.

02:57

Dialogue

02:59

click OK.

03:01

In the plan view you can see the

03:02

pond's appearance changed to reflect its new measurements.

03:06

In this example, the pond displays a blue line,

03:11

this is a layer of imported cad data that

03:13

gave an outline of the pond's initial shape and size

03:17

since it is no longer relevant,

03:19

click the box next to the pond outline dot D W G node in the tree view to deactivate it

Video quiz

Which of the following is NOT critical for calculating an appropriate pond size?

(Select one)
Select an answer

1/1 questions left unanswered

Conducting a Quick Storage Estimate Step-by-Step Guide

It appears you don't have a PDF plugin for this browser.

Was this information helpful?