|
|
|
|
|
|
|
based on the minimum tractive tension (rather than self-cleansing velocity) design approach: this is now commonly used in southern Brazil and it needs to be more widely known. |
|
|
|
|
|
|
|
|
I hope that this book will help to disseminate low-cost sewerage to a wider audience. If it succeeds in this, its publication will have been most worthwhile. |
|
|
|
 |
|
|
|
|
DUNCAN MARA
LEEDS, FEBRUARY 1996 |
|
|
|
|
|