Best Practice for Detention Basin Design Gavin Fields Senior Water - - PowerPoint PPT Presentation

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Nov 25, 2022 14 likes •306 views

Best Practice for Detention Basin Design Gavin Fields Senior Water Resources Engineer XP Solutions XPSolutions Software for modeling wastewater, stormwater, and floods Graphical User Interface (GUI) and analytical engines CAD/GIS

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Best Practice for Detention Basin Design

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Gavin Fields Senior Water Resources Engineer XP Solutions

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Software for modeling wastewater, stormwater, and floods Graphical User Interface (GUI) and analytical engines CAD/GIS type interface and data management tools Graphical reports, maps, animations 1D analytical engine solves the complete St. Venant (Dynamic Flow)

equations for gradually varied, one dimensional, unsteady flow

2D analytical engine embedded as xp2D

XPSolutions

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This is part of our XP-LIVE educational program Webinars have been recorded and are available at

http://www.xpsolutions.com/

Question/Answer XP-LIVE Webinars

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Introduction Theory Application Demonstration Q&A Best Practice for Detention Basin Design

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Introduction

Why do we need / design detention devices? Pre-developed Developed

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The good

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The bad

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The ugly

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History The impact of development has been directly observed

throughout history

Engineers and scientists challenged themselves to

understand stormwater systems to protect our populations, buildings and infrastructure

Thus the field of hydrology evolved… and at times

detention basins are seen to be the ‘cure’

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Theory Detention relies on the principle that flows can be

delayed by the addition of storage or a new lossto the system

Calculations must conserve mass and energy For orifice controls a key equation is:

()

() = 1

()

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Theory Open detention basins that are subject to infiltration

calculations are driven by depth, generally based on Darcy’s Law, Horton or Green-Ampt Equations

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Application Industrial Site – 2.83ha – 80% Impervious

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Application

0.1 0.2 0.3 0.4 0.5 0.6 0:00 0:14 0:28 0:43 0:57 1:12 1:26 1:40 Discharge (m 3/ s) Tim e Tim e

Indu ndustr strial ial Si Site: 1 te: 100 00 Year ear 90 90 Mi Minute nute Di Discharges scharges

Existing

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Application

0.1 0.2 0.3 0.4 0.5 0.6 0:00 0:14 0:28 0:43 0:57 1:12 1:26 1:40 Discharge (m 3/ s) Tim e Tim e

Indu ndustr strial ial Si Site: 1 te: 100 00 Year ear 90 90 Mi Minute nute Di Discharges scharges

Existing Developed

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Application

0.1 0.2 0.3 0.4 0.5 0.6 0:00 0:14 0:28 0:43 0:57 1:12 1:26 1:40 Discharge (m 3/ s) Tim e Tim e

Indu ndustr strial ial Si Site: 1 te: 100 00 Year ear 90 90 Mi Minute nute Di Discharges scharges

Existing Developed Orifice

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Types Types

Open solutions (parks, ponds, lakes, etc.)

Cost effective to build, but land consumptive

Closed solutions (rainwater tanks, underground storage)

Expensive to build, but increase yield

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Example Closed Solutions

SPEL StormChamber

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Example Closed Solutions

SPEL Aquaflo

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Controls Structural controls include:

Pipes; Weirs; Orifices; and Valves.

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Controls

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What makes a good detention basin?

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Low Head

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Clever Control Example Hydraulic Brakes

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Optimised for Depth/Area/Discharge

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Modelling Detention Basins 1D data requirements Node Data

Storage Geometry Inflow

Link Data

Geometry Flow Losses, e.g. roughness and

structure impacts

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Tailwater Effects

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Software Demonstration

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Questions? Comments?

Thank you for joining this presentation,

Best Practice for Detention Basin Design

By Gavin Fields

gavin.fields@ xpsolutions.com

Contact XP Solutions

Americas: +1 888 554 5022 amsales@ xpsolutions.com Asia Pacific: +61 7 3310 2302 ausales@ xpsolutions.com EMEA: +44 0 1635 582555 uksales@ xpsolutions.com www.xpsolutions.com