Visual Hydraulics - Environmental XPRT · 2019. 6. 26. · Section 11 – Aeration tank effluent weirs • Weir type – Sharp crested • Weir length – 24 feet • 2 weirs total

Visual HydraulicsVisual HydraulicsHydraulic Modeling Software

Innovative Hydraulics

Visual Hydraulics DemonstrationVisual Hydraulics Demonstration

• Program overview


• Standard features

• Special features

• Sample hydraulic profile

• Questions/comments

• Special features examples

What can Visual Hydraulics model?What can Visual Hydraulics model?

• Full flow pipes • Open channels/tanks

• Gates/orifices/baffles • Weirs

• Flumes • Racks/screening devices

• Tank launders • Filter media

• Venturi meters • Contractions/enlargements

Standard Features


What can Visual Hydraulics model?What can Visual Hydraulics model?

• Unique/unequal flow splits

Special Features

• Special losses with known hydraulic data

• Manifolds/Diffusers

• Submerged weirs


Sample Hydraulic ProfileSample Hydraulic Profile

• Model a section of a wastewater treatment plant, from the outfall back through the aeration tanks


Aeration tanks

Final clarifiers

Chlorine tanks

Plant effluent channel

Step 1 Step 1 –– Starting water surface elevationStarting water surface elevation

• Water level at plant outfall = 850.75 (known value)

• Other option – Determine starting water surface elevation from a weir


Step 2 Step 2 –– Specify plant flowsSpecify plant flows

• Visual Hydraulics can model any number of plant flow conditions,including return flows. For this example, assume the following plant design flows:

Forward flows:

Minimum flow: 4 mgd

Average flow: 8 mgd

Max monthly flow: 13 mgd

Peak design flow: 20 mgd

Minimum flow: 2 mgd

Average flow: 4 mgd

Max monthly flow: 5 mgd

Peak design flow: 6 mgd

Return flows:


Step 3 Step 3 –– Begin the hydraulic profile!Begin the hydraulic profile!

Start calculating the hydraulic profile by working upstream of your downstream control point, which in this case is the plant outfall.

Section 1 – Outfall effluent weir

• Weir length – 6 feet

• Weir type – Sharp crested

• Weir elevation – 852.5

• Flow over weir – 4 mgd


Section 2 – Plant effluent channel

• Channel length – 120 feet

• Channel width – 6 feet

• Manning’s ‘n’ for concrete – 0.013

• Channel shape - rectangular

• Channel downstream invert – 847.0

• Channel slope – 0 ft/ft

• No channel bends

• Flow through channel – 4 mgd


Section 3 – Chlorine contact tanks effluent pipes

• Pipe length – 30 feet

• Diameter – 30 inches

• Hazen-Williams ‘C’ value - 120

Fittings:Flush entrance2 – 90 degree bendsExit

• Flow through pipe – 2 mgd each (4 mgd total)

• 2 pipes total


Section 4 – Chlorine contact tanks

• Tank length – 90 feet

• Tank width – 15 feet

• Manning’s ‘n’ for concrete = 0.013

• 2 tanks total

• 0 slope, invert = 841.0

• Each tank has six 90 degree bends


• Flow through tank – 2 mgd each (4 mgd total)

Section 5 – Chlorine tanks influent pipe from flow split




Fittings:Flush entrance4 – 90 degree bends3 – 45 degree bendsExit

• Flow through pipe – 4 mgd

• 1 pipe


Section 6 – Final clarifier effluent pipes to flow split




Fittings:Flush entranceExit

• Flow through pipe – 1 mgd each (4 mgd total)

• 4 pipes total (4 clarifiers)


Section 7 – Final clarifier effluent launders

• Launder length – 115 feet

• Launder width – 2 feet

• Launder invert at outlet = 853.8

• 4 launders total (4 clarifiers)


• Launder slope = 0 ft/ft

• Flow per launder – 1 mgd each (4 mgd total)*

* 0.5 mgd for half of the launder

Section 8 – Final clarifier effluent weirs

• 90 degree v-notch weir

• V-notch invert = 855.0

• Notches per tank = 265

• 4 weirs total (4 clarifiers)


• Flow over weir – 1 mgd each (4 mgd total)

Section 9 – Final clarifier influent pipes from flow split

• Pipe length = 65 feet

• Pipe diameter = 24 inches

• 4 pipes total




• Flow through pipe – 1.5 mgd each (1 mgd forward flow, 0.5 mgd return flow)

Section 10 – Aeration tank effluent pipes to flow split

• Pipe length = 325 feet

• Pipe diameter = 36 inches

• 2 pipes total




• Flow through pipe – 3 mgd each (2 mgd forward flow, 1 mgd return flow)

Section 11 – Aeration tank effluent weirs

• Weir type – Sharp crested

• Weir length – 24 feet

• 2 weirs total


• Weir elevation – 856.5

• Flow over weir – 3 mgd each (2 mgd forward flow, 1 mgd return flow)

Editing FeaturesEditing Features

• So what happens if something changes?

• Use Visual Hydraulic’s editing features to:- Change any part of your hydraulic profile- Insert a new section between two existing sections- Delete any section- Change flow conditions at any time- Take units off-line or put units on-line

• Any time a change is made, the entire hydraulic profile is automatically recalculated for you.


Editing ExamplesEditing Examples

• Insert a section between two existing sections

- Final clarifier center well ports

- 8 ports per clarifier, 8” x 12” in size

- Invert of ports – 851.0

• Change flow conditions


• Take units off-line

Summary FeaturesSummary Features

• Calculation summaries

• Summary equations

• Summary reports


Special FeaturesSpecial Features

• Head loss graph


• K value database

• Unequal flow splits

• Manifolds/Diffusers

• Special loss equations

Questions/CommentsQuestions/Comments


You can learn more about Visual Hydraulics at www.innovativehydraulics.net

Documents

Visual Hydraulics - Environmental XPRT · 2019. 6. 26. · Section 11 – Aeration tank effluent weirs • Weir type – Sharp crested • Weir length – 24 feet • 2 weirs total