Storm Water Drainage Master Plan for Jaisalmer City

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Storm Water Drainage Master Plan for Jaisalmer City

I prepared and finalized the above master plan in year 2007- 8 under Asian Development Bank assisted RUIDP – Phase II programme.

During the year 2006, due to excess rainfall Jaisalmer city experienced the problem of stagnation and flooding of residential and commercial areas.

Even the railway line was under water for 2-3 days. Therefore under above programme, I prepared the above drainage master plan as Storm Water Drainage Specialist . It took about 6 to 7 months to study, collect basic information, survey, design, drainage master plan, preparing cost estimates and then bid document. The cost of the works under drainage master plan was arrived at as Rs 46.50 million.

Due to financial constraints, only essential drains and other works constructed. But now the Jaisalmer city is is free from flood havoc and there is no report of flood damages in Jaisalmer city after construction of the essential drains and works. I understand that if the catchment area of the natural drains affecting the city is considered and than a proper drainage master plan is prepared, the city can be free from the flooding problem, at a reasonable cost. I will welcome comments if any, in this respect.

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  1. Dear Mr. Achar,

    1. Methodology – The topographical sheets from survey of India were obtained to determine the drainage area from which rain water will reach into Jaisalmer city. The contours and natural drainage channels were marked on the topographical sheets. The catchment area has been calculated using ‘tracing graph paper’. The total drainage area was determined as 120 square km. The Jaisalmer city, existing drains and various proposed alignments of new drains were visited and discussions were held with the Collector Jaisalmer, officials of the Municipal Board, PWD (B&R), Railway department & BSF. The study also revealed that the Railway station & Jaisalmer-Jodhpur railway line are the lowest level portion in the city. Thus the natural drainage of the city is along the railway line. The rain water from all sides of city has a natural flow towards railway station. Thereafter I visited the natural drainage channel below the catchment area upto its outfall into a river. The survey of the proposed drains and natural drainage channel upto river was got done. Longitudinal sections and cross sections were prepared upto river. With the help of L-sections and X-sections, the design of drains and their cross drainage structures were designed.

    2. Estimation of peak rainfall intensity by Statistical method

    The return period peak rainfall intensity and peak floods are estimated by statistical analysis, using available hydrological data at or around the site of the project./ structure. The statistical analysis is done to calculate peak rainfall intensities. Daily rainfall data of Jaisalmer city is available for the period year 1980 to 2007. Using this data, one day peak rainfall during a year has been identified. These peaks have been used for arriving at 1/2/5/10/25/50/100 year return period 24-hourly rainfall intensity by Gumbel Method, Least square method and Bell’s method. For one year return period only Bell’s formula is applicable. The Gumbel method is applicable for a storm having return period of 5 years or more. As per para 4.3 of IRC: SP: 50 – 1999, return period of one year has been adopted for estimation of run off from the catchment

    3. Software used – Microsoft excel sheet was used for the calculations. No particular software was used.

    I understand, I have replied to your query. Do you have any other question?

    Regards

    Yogesh Agrawal


  2. Dear Mr. Yogesh,
    Nice to know that a storm water drainage master plan was prepared for Jaisalmer. As a hydrologist I am curious to know what was the methodology adopted for establishing the total flow for drainage design. Was simple Rational Method adopted or a Regional Study and equation already established in the area utilised ? Any software was used in drainage design?
    Regards,Achar

  3. Its good to hear that Flooding is a problem with a solution. I hope you like the drainage system Wateringpipe. I hope it will help cities such as Jaisalmer but for less cost. www.Wateringpipe.co.uk

    1 Comment reply

  6. Sorry, I have been able to extract the map and enlarge it. Are the numbers significantly? Is the yellow specific areas? Thanks, John

  7. Great to see what you have done and this could be a model for other cities. It is hard to see what's on the Map so would it be possible to send a high resolution copy to jtrought@bigpond.net.au ? Thanks, John