B.E./B.Tech. DEGREE EXAMINATIONS, APRIL/MAY-2013CE-2355 ENVIROMANTAL AND IRRIGATION DRAWING LAB(B.E. CIVIL ENGINEERING) REGULATIONS-2008 Time: 3 hours Max. Marks: 100

1. Design the rapid sand filter unit of 5 million liter/day of supply with all its principal components. Draw the plan and longitudinal section of the

2. Design and draw coagulation-cum-sedimentation tank with continuous flow for a population of 70,000 with a daily per capita water allowance of 120 liters.

3. Design a septic tank for 120 persons. Assume per capita sewage as 150 lpcd cleaning period is 1 year L/B=4.5 percolation rate in soak well = 1300 l/m3/day DT = 24 hrs. Draw the plan and section only

4. A rectangular grit chamber is designed to remove particles with a diameter of 0.2 mm specific gravity 2.65; settling velocity for these particles has to be found to be between 0.016-0.022 m/s depending on their shape factor. A flow through velocity of 0.3 m/s will be maintained by proportioning weir. Determine the channel dimension for a maximum waste flow of 20, 000 m3/day. Draw the plan and longitudinal cross-section

5. Design a screen chamber for a sewage treatment plant treating a peak flow of 60 MLD of sewage

6. Design a concrete gravity Dam for following data: max. allowable compressive stress = 300kN/m2 , max reservoir level = 200 m, R.L. of bottom of dam = 100 m, specific gravity of dam material (Sc) = 2.4.7. Design and draw the cross-section of a sludge digestion tank for the primary sludge with the help of the following data. 1. Ave flow = 30 MLD2. Total suspended solids in raw sewage = 300 mg/L3. Moisture content of digested sludge = 85 %Assume any other suitable data you require.

8. Design and draw a sluice taking off from a tank Irrigating 225 hectares at 1000 duty. Thetank bund through which the sluice is taking off has a top width of 2 meters with 2:1 sideslopes. The top level of bank is +40.00 and ground level at site is +34.50. Good hardsoil for foundation is available at +33.50The sill of the sluice at off take is +34.00. The maximum water level in tank is 38.00.The full tank level is +37.00. Average low water level of the tank is + 35.00 . The detailsof the channel below the sluice are as under.Bed Level = +34.00F.S.L = +34.50Bed width = 1.25 metersSide slopes = 1 to 1 with top of bank at + 35.50

9. Draw a detailed sketch of a canal cross regulator

10. Design a surplus weir for minor tank forming a group of tanks with the following available information. Combined catchment area = 30 sq.km. Catchment area intercepted by the upper tank = 20 sq.km. Ryyes constant or coefficient = 9 The earth bund has the following details:Top width = 2.4 m Side slopes = 2 : 1 on both sides Top level of bund = 100.5 m Full tank level = 98.0 m Maximum water level = 98.75 m General ground level at the site is 97 m Ground level slopes of to a level 96 m in a distance of 8 m Provision is to be made to store water upto maximum water level in times of necessity Draw half longitudinal section and half longitudinal elevation.