Effectiveness of Time of Concentration Elongation on Peak Flow Reduction

2008 ◽  
Author(s):  
K. Zomorodi
Keyword(s):  
Peak Flow ◽  
Time Of Concentration ◽  
Flow Reduction

Peak flow reduction from small catchments using smart inlets

2019 ◽  
Vol 17 (7) ◽  
pp. 577-586 ◽  
Author(s):  
Nils Kändler ◽  
Ivar Annus ◽  
Anatoli Vassiljev ◽  
Raido Puust
Keyword(s):  
Peak Flow ◽  
Flow Reduction ◽  
Small Catchments

scholarly journals Modeling for Mitigating Storm Water Unban Flooding and Water Quality Issues by Using Small Serial Dams: A Case Study of the City of San Angelo

2021 ◽  
Keyword(s):  
Water Quality ◽  
Peak Flow ◽  
Pollutant Removal ◽  
Storm Water ◽  
Coefficient Of Determination ◽  
Event Mean Concentration ◽  
Flow Reduction ◽  
Pollutant Reduction ◽  
Water Pollutant ◽  
The City

<p>The City of San Angelo has been imposed on urban flooding and no-point source pollution and develop storm water monitoring and modeling project for managing these storm water issues. This study focuses on the stormwater peak flow reduction and water pollutant improvement by using small serial retention structures. The storm water data collected are utilized to verify storm water and event mean concentration in SWMM model. The verified SWMM that has range from 0.6 to 0.8 of coefficient of determination is modeled to evaluate small serial dams for reducing peak flow and water quality loading. Small serial dams explain the 26%~55.3% peak flow reduction and 53.2%~93.7% water pollutant removal percent. Sensitivity analysis results for three kinds of orifice sizes provide that smaller size increases the hydraulic retention and reduces the peak flow than other bigger size while the bigger size shows effective water pollutant reduction than small size.</p>

scholarly journals Evaluation of low impact development and best management practices on peak flow reduction using SWMM

2021 ◽  
Vol 646 (1) ◽  
pp. 012045
Author(s):  
Bryant Chong Choy Xian ◽  
Choong Wee Kang ◽  
Mahyun Ab Wahab ◽  
Mohd Remy Rozaini Mohd Arif Zainol ◽  
Fauzi Baharudin
Keyword(s):  
Best Management Practices ◽  
Management Practices ◽  
Peak Flow ◽  
Low Impact Development ◽  
Flow Reduction ◽  
Best Management

scholarly journals A Simple Method to Develop a Formula for Estimating Concentration Time of Drainage Design

2020 ◽  
Vol 8 (3) ◽  
pp. 137-142
Author(s):  
Alfiansyah Yulianur ◽  
Sugianto Sugianto ◽  
Frystia Mala Puspita
Keyword(s):  
Catchment Area ◽  
Rainfall Intensity ◽  
Peak Flow ◽  
Measurement Data ◽  
Zoysia Japonica ◽  
Simple Method ◽  
Time Of Concentration ◽  
Estimation Formula ◽  
Concentration Time ◽  
Drainage Design

Concentration time of rainfall is an important aspect to determine drainage design. A general rational formula is used to determine design flood or peak flow in urban drainage planning, especially for storm sewer design. The use of this balanced formula requires rainfall intensity, whose duration of rain is equal or more than the time of concentration. This time of concentration is determined using an estimation formula whose formation requires measurement data of the time of concentration. This study introduces how to measure the time of concentration using the concept of-rational-hydrograph, in which peak flow occurs at the time of concentration. To fulfill the aim of this research, an experimental of catchment area planted with Zoysia Japonica grass and showered with a rainfall simulator was conducted. The length of the flow path on the land, L, given in 5 variations, namely 50 cm, 100 cm, 150 cm, 200 cm, and 250 cm, was used. The slope of the land, S, is given in 3 variations, namely 2.8 %, 5,6%, and 8.8%. For each variation of L and S, the experimental catchment area was poured with a fixed rainfall intensity, which is 60 mm/hour. The flow was measured every 5 minutes intervals. Then, from the relationship of flow and time, a rational hydrograph was formed, from which the time of concentration, Tc, was deduced. This Tc value was treated as the measured Tc to form the Tc estimation formula using the regression formula. The formula is Tc = 3.543 + 1.211 L – 17.119 S, with the coefficient of determination R2 = 0.98. These results show that the determination of Tc using the concept of the rational- hydrograph is acceptable. This formula applies to L and S values greater than zero and applies to land covered by Zoysia Japonica grass. Further research is needed for other types of land cover to validate the formula obtained in this research.

Using the Rational Method for Design in Complex Urban Basins

1998 ◽  
Vol 29 (2) ◽  
pp. 73-90
Author(s):  
Lars Bengtsson ◽  
Janusz Niemczynowicz
Keyword(s):  
Peak Flow ◽  
Drainage System ◽  
Rational Method ◽  
Design Flow ◽  
Time Of Concentration ◽  
Planning And Design ◽  
Urban Planning And Design ◽  
Derived Design ◽  
Reduced Time ◽  
Different Parts

Because of its simplicity the rational method is still frequently used in urban planning and design. In this paper using the time-area method and statistically derived design storms, the design peak flow is computed for urban basins of different complexity and compared with the design flow determined from the rational method. It is shown that the design flow is underestimated using the rational method unless a reduced time of concentration is used. The relation between travel times in different parts of a drainage system is used to correct the design flow computed by the traditional rational method.

AN EXAMPLE OF IN-STREAM PEAK FLOW REDUCTION TARGETS BASED ON HABITAT AND GEOMORPHIC INDICES

2004 ◽  
Vol 2004 (4) ◽  
pp. 892-902
Author(s):  
Scott Dierks ◽  
Theresa Dakin ◽  
Michael J. Wiley ◽  
Michelle West
Keyword(s):  
Peak Flow ◽  
Geomorphic Indices ◽  
Flow Reduction
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