Entrance resistance of enveloped drain pipes | |
| Author | Sekendar, M. A. |
| Call Number | AIT Thesis no.AE-81-06 |
| Subject(s) | Pipe--Testing Drainage |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Entrance resistances and effective radii of drain pipes without envelope and with six different prewrapped envelopes were evaluated in a sand tank experiment. With a K-value of the sand of 22.0 m/day, the entrance resistance of the naked pipe was 0,0136 days/m. The enveloped drain pipes gave entrance resistances of 0.0024 to 0.0067 days/m of which the four sheet type envelopes have the values 0.0036 to 0.0067 days/m. These values are high compared to the two voluminous types about 1 cm thickness, entrance resistance values of 0.0024 and 0.0025 days/m were found. Assuming a field K-value of 0.50 m/day, all the enveloped pipes could be classified as very good. The voluminous type of envelopes. gave higher quantity of sand washed into the pipe (587 to 827 gm/m) compared to sheet types (215 to 459 gm/m). The effective radii of 0.47, 1.44 and 2.5 cm were found for naked, fibertex sheet I and coco fibre, respectively. These were used in three steady state drainage equations instead of the actual drain radius to evaluate the effect on the drain spacing in a homogeneous soil. All the equations showed an increase in drain spacing by using enveloped pipes compared to the naked pipe. |
| Year | 1981 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Olesen, Svend Elsnab; |
| Examination Committee(s) | Apichart Anukularmphai ;Christoph, Ing. Fried ; |
| Scholarship Donor(s) | The Royal Norwegian Government ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1981 |