Urban Storm Water Drainage System in the Central Part of Addis Ababa, Ethiopia—Present State and Proposals for the Improvements

2002 ◽  
Author(s):  
D. Muschalla ◽  
M. Ostrowski
Keyword(s):  
Present State ◽  
Addis Ababa ◽  
Drainage System ◽  
Storm Water ◽  
Water Drainage ◽  
Urban Storm

scholarly journals Hydrological and Hydraulic Analyses of Urban Storm Water Drainage System of Major Area of Pokhara, Nepal

2020 ◽  
Vol 3 (1) ◽  
pp. 78-91
Author(s):  
Keshav Basnet ◽  
Krishna Chettri ◽  
Ganesh Parajuli ◽  
Achyut Bhandari
Keyword(s):  
Surface Runoff ◽  
Drainage System ◽  
Storm Water ◽  
Estimation Methods ◽  
Water Drainage ◽  
Major Area ◽  
The Road ◽  
On The Road ◽  
Almost All ◽  
Urban Storm

The immense increase of the structural activity which decreases the pervious area of the city is alarming danger situation pertaining to drainage. Urbanization and improved area of imperviousness are the major contributors that make the existing drainage network insufficient while inadequate maintenance and haphazardly throwing rubbish on the road and drain are other issues. The major objective of the study is to analyze the hydrological and hydraulic status of the urban storm water drainage system of the major area of Pokhara City of Nepal and to compare the calculated result with existing situation, using Rehm tools HYKAS and GraPS under AutoCAD environment. The results of this study show that the size of the existing road side drains is inadequate to handle all the surface runoff. It is found that the existing situation of the drainage system is quite poor and need to be redesign or reconstruct immediately. The hydraulic load of almost all the conduit is beyond the limit assigned. The hydraulic design of the most of the drainage conduit is inadequate and re-design of the drain is essential based upon accurate flow estimation methods. This study concludes that the applicability of the current drainage system is quite poor and needs to make certain changes with their construction immediately in order to avoid any danger and adverse effect possessed by surface flooding over the road surface and other paved surfaces. The surface runoff is significantly increased compared to the situation before the construction of existing drainage system and therefore for the appropriate storm water management of the urban area of Nepal, it is critical to design the drainage system based on both hydrological and hydraulic analyses considering reliable data.

Impacts of urban storm-water drainage channels on a northern Australian mangrove forest

Trees ◽  
2001 ◽  
Vol 16 (2-3) ◽  
pp. 195-203 ◽  
Author(s):  
Anja Moritz-Zimmermann ◽  
Keith A. McGuinness ◽  
Manfred Küppers
Keyword(s):  
Mangrove Forest ◽  
Storm Water ◽  
Water Drainage ◽  
Drainage Channels ◽  
Urban Storm

scholarly journals Simulation studies of storm water drainage in Wrocław

2018 ◽  
Vol 44 ◽  
pp. 00129
Author(s):  
Monika Nowakowska
Keyword(s):  
Hydrodynamic Model ◽  
Drainage System ◽  
Storm Water ◽  
Simulation Studies ◽  
Water Drainage ◽  
Residential Areas ◽  
Residential Communities ◽  
Flood Volume ◽  
Maximum Water ◽  
Water Impoundment

In the paper were made the verification of the operation of a rainwater drainage system in the residential communities of Gaj and Tarnogaj in Wrocław, carried out in the hydrodynamic model using SWMM software. There were used two criterial precipitation: Euler’s model (with a frequency of C = 3 years) and the actual precipitation (C = 5 years). The criteria of overloading the system was the specific flood volume (SFV). For both cases of precipitation load of catchment, the simulated calculations showed the occurrence of outflows from the channels. Due to the value of SFV indicator (respectively: 19 m3/ha and 42,9 m3/ha), it was found that the tested system needs modernization, therefor acceptable instantaneous water level above the maximum water impoundment were more often than 1 per 3 years, which leads to overflows from channels for residential areas more often than allowed once every 20 years.

scholarly journals Flood Mitigation Techniques—A New Perspective for the Case Study of Adayar Watershed

2017 ◽  
Author(s):  
Vidyapriya V. ◽  
Ramalingam M.
Keyword(s):  
Drainage System ◽  
Flood Mitigation ◽  
Storm Water ◽  
Mitigation Measures ◽  
Complex Nature ◽  
Adjacent Area ◽  
Drainage Network ◽  
Flood Events ◽  
Water Drainage ◽  
Impervious Area

Mostly populous city like Chennai is subjected to frequent flooding due to its complex nature of natural and man-made activities. From the analysis of the past records of flood events of 1943,1976,1985,2005 and 2008,it has been observed Adayar watershed is subjected to cataclysmic flooding in low-lying areas of the city and its suburbs because of inoperativeness of the local drainage system, rainfall associated with cyclonic activity, topography of the terrain, encroachments along the floodplain, hugh upstream flow discharge into the river and the highly impervious area which blocked the runoff to flow into the storm water drainage. After looking into these problems of flooding, a study have been conducted on Adayar watershed to develop a 2D hydrodynamic model for the two scenarios of existing condition of storm water drainage network and revised conditions of storm water drainage network using high resolution Lidar DEM to assess the volume of runoff with respect to time and duration on flood peaks for the two flood events of 2005 and 2015.Secondly to develop a 1D flood model to predict the river stages during peak floods using MIKE 11 for the Adayar watershed. Thirdly to integrate the coupled 1D and 2D model using MIKEFLOOD for assessing the extent of inundation in the floodplain area of Adayar river. Finally results from the integrated model have been validated and the results found satisfactory. As a part of mitigation measures, two flood mitigation measures have been adopted. One measure such as revised storm water drainage system which enhances the flood carrying capacity of the drains and results in less inundated area which solves the problem of urban flooding and second measure such as regrading the river bed which reduces the floodplain inundation around the adjacent area of the river. After adopting these measures, the river is free to flow into the sea without any blockades.

scholarly journals AN ANALYSIS ON THE EFFICIENCY OF GREEN ROOF IN MANAGING URBAN STORMWATER RUNOFF

2021 ◽  
Vol 19 (17) ◽  
Author(s):  
Shazmin Shareena Ab. Azis ◽  
Muhammad Najib Mohamed Razali ◽  
Nurul Hana Adi Maimun ◽  
Nurul Syakima Mohd Yusoff ◽  
Mohd Shahril Abdul Rahman ◽  
...  
Keyword(s):  
Flash Flood ◽  
Meta Analysis ◽  
Green Roof ◽  
Drainage System ◽  
Green Roofs ◽  
Storm Water ◽  
Water Runoff ◽  
Extensive Green Roof ◽  
Storm Water Runoff ◽  
Urban Storm

Modernization has created new impervious urban landscape contributed to major catastrophe. Urban drainage system incapable to convey the excess rainwater resulting in flash flood due to heavy rainfall. The combination of green roof on building have tremendously proved to control stormwater efficiently. This study is conducted to review the efficiency of intensive and extensive green roof in reducing urban storm water runoff. This study identifies characteristic of green roof that contributes to lessening urban storm water runoff. Data was collected based on rigorous literature reviews and analyzed using meta-analysis. Overall, findings revealed intensive green roof performed better in reducing storm water runoff compared to extensive green roof. Green roof performance increases as the depth of substrate increased. Origanum and Sedum plants are both highly effective for intensive and extensive green roofs. The performance of green roof reduces as degree of roof slope increased.

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