Estimation of Storm-Centred Areal Reduction Factors from Radar Rainfall for Design in Urban Hydrology

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Abstract

In the design practice of urban hydrological systems, e.g., storm-water drainage systems, design rainfall is typically assumed spatially homogeneous over a given catchment. For catchments larger than approximately 10 km2, this leads to significant overestimation of the design rainfall intensities, and thus potentially oversizing of urban drainage systems. By extending methods from rural hydrology to urban hydrology, this paper proposes the introduction of areal reduction factors in urban drainage design focusing on temporal and spatial scales relevant for urban hydrological applications (1 min to 1 day and 0.1 to 100 km2). Storm-centred areal reduction factors are developed based on a 15-year radar rainfall dataset from Denmark. From the individual storms, a generic relationship of the areal reduction factor as a function of rainfall duration and area is derived. This relationship can be directly implemented in design with intensity–duration–frequency curves or design storms.
Original languageEnglish
Article number1120
JournalWater
Volume11
Issue number6
ISSN2073-4441
DOIs
Publication statusPublished - 2019

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Hydrology
Radar
radar
hydrology
Rain
Drainage
rain
rainfall
drainage systems
urban drainage
Catchments
Denmark
stormwater sewer systems
rainfall duration
catchment
rain intensity
water
Water
precipitation intensity
drainage

Bibliographical note

This article belongs to the Special Issue Urban Rainfall Analysis and Flood Management.

Keywords

  • Areal reduction factor
  • Areal rainfall
  • Design storms
  • Urban drainage

Cite this

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title = "Estimation of Storm-Centred Areal Reduction Factors from Radar Rainfall for Design in Urban Hydrology",
abstract = "In the design practice of urban hydrological systems, e.g., storm-water drainage systems, design rainfall is typically assumed spatially homogeneous over a given catchment. For catchments larger than approximately 10 km2, this leads to significant overestimation of the design rainfall intensities, and thus potentially oversizing of urban drainage systems. By extending methods from rural hydrology to urban hydrology, this paper proposes the introduction of areal reduction factors in urban drainage design focusing on temporal and spatial scales relevant for urban hydrological applications (1 min to 1 day and 0.1 to 100 km2). Storm-centred areal reduction factors are developed based on a 15-year radar rainfall dataset from Denmark. From the individual storms, a generic relationship of the areal reduction factor as a function of rainfall duration and area is derived. This relationship can be directly implemented in design with intensity–duration–frequency curves or design storms.",
keywords = "Areal reduction factor, Areal rainfall, Design storms, Urban drainage, Areal reduction factor, Areal rainfall, Design storms, Urban drainage",
author = "Thorndahl, {S{\o}ren Liedtke} and Nielsen, {Jesper Ellerb{\ae}k} and Rasmussen, {Michael R.}",
note = "This article belongs to the Special Issue Urban Rainfall Analysis and Flood Management.",
year = "2019",
doi = "10.3390/w11061120",
language = "English",
volume = "11",
journal = "Water",
issn = "2073-4441",
publisher = "M D P I AG",
number = "6",

}

Estimation of Storm-Centred Areal Reduction Factors from Radar Rainfall for Design in Urban Hydrology. / Thorndahl, Søren Liedtke; Nielsen, Jesper Ellerbæk; Rasmussen, Michael R.

In: Water, Vol. 11, No. 6, 1120, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Estimation of Storm-Centred Areal Reduction Factors from Radar Rainfall for Design in Urban Hydrology

AU - Thorndahl, Søren Liedtke

AU - Nielsen, Jesper Ellerbæk

AU - Rasmussen, Michael R.

N1 - This article belongs to the Special Issue Urban Rainfall Analysis and Flood Management.

PY - 2019

Y1 - 2019

N2 - In the design practice of urban hydrological systems, e.g., storm-water drainage systems, design rainfall is typically assumed spatially homogeneous over a given catchment. For catchments larger than approximately 10 km2, this leads to significant overestimation of the design rainfall intensities, and thus potentially oversizing of urban drainage systems. By extending methods from rural hydrology to urban hydrology, this paper proposes the introduction of areal reduction factors in urban drainage design focusing on temporal and spatial scales relevant for urban hydrological applications (1 min to 1 day and 0.1 to 100 km2). Storm-centred areal reduction factors are developed based on a 15-year radar rainfall dataset from Denmark. From the individual storms, a generic relationship of the areal reduction factor as a function of rainfall duration and area is derived. This relationship can be directly implemented in design with intensity–duration–frequency curves or design storms.

AB - In the design practice of urban hydrological systems, e.g., storm-water drainage systems, design rainfall is typically assumed spatially homogeneous over a given catchment. For catchments larger than approximately 10 km2, this leads to significant overestimation of the design rainfall intensities, and thus potentially oversizing of urban drainage systems. By extending methods from rural hydrology to urban hydrology, this paper proposes the introduction of areal reduction factors in urban drainage design focusing on temporal and spatial scales relevant for urban hydrological applications (1 min to 1 day and 0.1 to 100 km2). Storm-centred areal reduction factors are developed based on a 15-year radar rainfall dataset from Denmark. From the individual storms, a generic relationship of the areal reduction factor as a function of rainfall duration and area is derived. This relationship can be directly implemented in design with intensity–duration–frequency curves or design storms.

KW - Areal reduction factor

KW - Areal rainfall

KW - Design storms

KW - Urban drainage

KW - Areal reduction factor

KW - Areal rainfall

KW - Design storms

KW - Urban drainage

U2 - 10.3390/w11061120

DO - 10.3390/w11061120

M3 - Journal article

VL - 11

JO - Water

JF - Water

SN - 2073-4441

IS - 6

M1 - 1120

ER -