Introduction all now that flooding is a natural disaster.

Introduction    The drainage system is a very important in floodmanagement in srilanka. In Colombo city some locations are heavily affected byflooding. The main reason for this flooding is urbanization, population andchanges in climate. If the urban flooding occurs there can be a disaster forenvironmental as well as infrastructure damages such as roads, buildings, houses,and the lives of people   as well astheir properties.

the existing drainage system is   very ancient and design on the early design data’s.So, in order to do some modification in an efficient way to overcome theflooding. The main aim of drainage system is to dispose of rain water andsewages to overcome un wanted diseases and pollution to the environment. The increaseof urbanization may lead to flood discharge where there are changes in surfaceprofile also causes runoff patterns. When we compare the forest land and the urbanland we can clearly see that in forest land surface runoff is very lowpercentage and in the urban land the percentage of the surface run off is veryhigh.

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From this how the urbanization influence in the flood management inColombo city. For the drainage system for the Colombo city isplanning to design in SWMM (Storm Water Management Model) which is very easy todesign by inputting hydrological data’s.  Problem Statement Colombo city is busy city in srilanka. So, in order todo a flood management in a proper way.so we have to design a good drainagesystem to overcome the flooding.

If the flooding occurs because of poordrainage system and causes damages to human beings as well as property. So Givea good solution is a must in Current scenario. Significance of the research as all nowthat flooding is a natural disaster. We can’t stop that as we want.

so we mustmake a solution to over come that issue in Colombo city. urbanization inColombo city is a main problem for flooding. but we can’t stop the urbanizationbecause of Colombo city is very much people are dense because of the higherstudies and career development. So, any way we have to do some analysis on floodmanagement in Colombo city. First we have to do the analysis in the criticalarea which is heavily affected by flooding.

so if we do this research in veryeffective manner in the end of this we can clearly give a valuable results tothe people who are affected .so in that view the drainage system development isvery useful for the nation. We have identified the issues in that existingsystem and do modification or design a new drainage system according to the nowa day’s climate changes and futures expectation. That is also very useful forfuture generation as well.  Scope of the studyFor the case study we are using SWMM (Storm WaterManagement Model)for analyzing the results of the existing drainage systemand find out the blunders in that system using this software.

This is very commonlyused software and effective tool in utilized flooding.  From the SWMM software we can design the drainagesystem as we want and also we can adjust the current drainage system. For theparticular area. first we have to identify the catchment area and also receiveof precipitation. Then we must get the rainfall data’s and other relevantthings from the department.

Not only that we must identify the sub catchmentarea and find out the quality and quantity of run off generated in each area.From SWMM software  ·        Time to time varying climate changes as the reason forrainfall differences.·        Evaporation from the surface·        Infiltration in to the groundthis consideration should be done in SWMM softwarethen only we can design a perfect drainage system.  Aims and Objectives Identify the most critical frequently affected area inColombo city and develop a drainage system with very cost-effective manner tothe nation people.

   Methodology ·        Analyzing and finding critical area in Colombo city whereflooding occurs frequently·        Gathering data’s in particular zone from the relevantdepartment such as rainfall ,run off data’s and other hydrological data’s·        Interview the residence people about their problem whenflooding occurs·        Get an rough idea about the run off land profile of the area.·        Get familiar with the SWMM software for the designing.·        Design the drainage system using gathered information ineffective manner.·        Finalize the model and implementing the design