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Watershed problem and management ; study on Khulna University,Bangladesh

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Watershed Management

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Watershed problem and management ; study on Khulna University,Bangladesh

  1. 1. Course Title: Watershed Management Sessional / Field work
  2. 2.  Watershed  Objectives of watershed survey.  Measurement areas in a watershed  Buildings, roads and other constructions of Khulna University  Water bodies of Khulna University  Vegetative areas of Khulna University  Survey results  Problems to the watershed of Khulna University area  Overall condition of Khulna University Watershed.
  3. 3.
  4. 4.  A watershed, also called a drainage basin or catchment area, is defined as an area in which all water following into it goes to a common outlet.  It can be defined as a unit of area that covers all the land which contributes runoff to a common point
  5. 5.  The area of land that drains water, sediment, and dissolved materials to a common outlet at some point along a stream channel”.(De Barry)  According to FAO (1986) “Watershed is a topographically delineated area that has drained by a stream system i.e. the total land area that is drained to some point on a stream or river”.
  6. 6.  To know how to estimate the watershed of any given area.  To know the drainage condition of the area.  To know the health of the vegetation .  To identify watershed problems and potential sources of pollution.  To determine the possible cautions to preserve watershed.  To help in proper management of watershed.
  7. 7.  To know the features of watershed  Carrying capacity assessment  Health assessment of watershed  Risks assessment of watershed  Planning and design  Implementation  Monitoring  Readjustment of the plan of monitoring
  8. 8.  Vegetation: Including trees, grasses, It prevents soil erosion and land degradation  Topography  Soils: Drainage system, water holding capacity, texture all the properties control watershed  Water body: Main component of watershed. Pollution of water is responsible for changing ecosystem and environment. Propagation of fishes and other aquatic animals depends on water body.
  9. 9. Watershedfunction ecological function hydrological function Confluence function water conservation function regulating function the function of chemical transport Habitat function
  10. 10. Concrete Surface. • Roads • Buildings • Other constructions Water Body • Lakes • Ponds • Canals • Rivers
  11. 11. 19
  12. 12. Road Area(sq. meter) Brick road from Aparajita hall to teachers’ quarter 1824 Brick road to employees building 272 Brick road beside Khan Bahadur Ahsanullah Hall 1000 Brick road in front of Bangabandhu hall 1032 Pucca road from Khanjahan Ali hall to Aparajita hall gate 4632 Pucca road from KU lake to Aparajita hall gate 80 Pucca road from KU main gate to Hadi Chattor 3048 Pucca road in front of KU Medical 152 Brick road in front of Khan Bahadur Hall 648 Pucca road in front of bus stand 324
  13. 13. Road Area (sq. meter) Cafeteria road 164 Pucca road(s) from administration building to teachers quarter 2368 Brick road beside teachers quarter 868 Brick road to the play ground 128 Brick road beside administration building 1152 Brick road beside post office, bank 268 Brick road beside bank 144 Brick cover beside 2nd academic building 448 Brick road in front of Adammo Bangla 1056 Brick road from central library to the back of 2nd academic building 2088
  14. 14.  Moderate to severe surface erosion  Road Shoulder erosion  Direct flow to water body
  15. 15.  The buildings and constructions have a negative effect on a watershed.  The clearing of vegetation due to construction, leads to erosion. Building materials are also washed into the water bodies. This has an adverse effect on stream and river health too.
  16. 16. Buildings
  17. 17. Building Name Area (sq.m) Academic Building- 1 2580 Academic Building -2 5432 Academic Building -3 5040 Khan Jahan Ali Hall 2980 Khan Bahadur Ahasanullah Hall 2800 Aparajita Hall 6012 Shaik Mujib Hall 2980 Caféteria 532 Central Mosque 360 Motor Cycle Stand 130 Primary School 280 BNCC Office 105 Purnendo Gain Lab 72
  18. 18. Building Name Area (sq.m) V.C Banglo 244 Stuff Quarter - 1 580 Stuff Quarter - 2 600 Sharli Islam Library 415 Central Library 2556 Adohmmo Bangla 144 Shahid Miner 120 New Bank 85 Administrator Building 2292 Post Office 80 Agroni Bank and KU Studies 288
  19. 19. Building Name Area (sq.m) Teachers Quarter - 1 180 Teachers Quarter - 2 185 Mukto Mancho 155 Medical Office 256 Agro-technology lab - 1 240 Agro-technology Lab - 2 240 Green House 54 Police Fary New 205 Forestry Lab - 1 245 Forestry Lab - 2 244 Roterate office 72
  20. 20.  Run off after precipitation  Roof run off causing erosion  Improper ground water recharge
  21. 21.  Total area of roads : 5.359 Acres.  Total area of buildings and other constructions :8.50421 Acres.  So, total runoff area is  5.359+8.50421=13.8632 Acres
  22. 22.  Crucial part of a watershed.  Consists mainly of Lakes Ponds Channels Rivers Seas Ocean
  23. 23. Survey Area Name Area(m2) Pond of Khan Bahadur Ahsanullah Hall 2368 Frontage pond of Khan Bahadur Ahsanullah Hall 576 Ponds behind the Khan Jahan Ali Hall 1728 Central library(frontage side) pond (small) 360 Canal behind the 3rdaceademicbulding 3712 Pond Behind the quarters 1272 Fisheries' area beside the 2nd academic building 4340
  24. 24. Pond(small) behind the Odommo Bangla monument 3311 Fisheries area beside the 1st academic building 33588 42 Pond behind the Aporajita Hall 1356 Pond beside the Mosque 2688 University lake 14776 Total: 40075
  25. 25.  The total area of water body = 9.899 Acres.
  26. 26.  Moderate to severe erosion  Ditch erosion  Throwing plastics, bottles, garbage etc to the paths of water flow  Filling the water channels with sediments and waste materials.
  27. 27.  Another inseparable element in any watershed is vegetation. The vegetation in watersheds have impacts on  The quality of the water  Reducing sedimentation  Wildlife and bird habitat,  Soil health.  Air quality, etc. Grasses, shrubs, and trees make up the majority of plant cover . As leaves fall and decompose, they add the organic matter to the soil
  28. 28.  Total Vegetative area =81.8378 Acres.
  29. 29.  Slight or moderate surface erosion  Direct flow or runoff to water bodies  Throwing various waste materials  Using some forest grounds as parking lot.
  30. 30. Ridge line Sub Stream Outlet Main Stream Figure-1: Watershed in river basin with sub stream Sub Watershed Sub Watershed Sub Watershed Sub Watershed Main channel Sub channel Sub channel Sub channel Outlet Figure-2: A watershed with sub watershed and sub basin
  31. 31. Play ground and Agricultural land of Khulna University
  32. 32. Components Area (acre) Water Body 7.319 Building 9.408 Road 5.359 Vegetative land 81.40 Total area 105.6
  33. 33. Water Body Building Road Vegetative Land
  34. 34.  Khulna University area possesses sub parallel and radial type of watershed

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