The Step Draw-Down Pumping Test (SDT) was developed by Jacob to determine aquifer transmissivity and well properties in cases where the standard method is inapplicable, for example, the absence of observation wells.
| Title | Step draw-down pumping test |
| Publication Type | Miscellaneous |
| Year of Publication | 1991 |
| Authors | Hydbom, B |
| Secondary Title | Water and engineering technical information bulletin |
| Volume | no. 4 |
| Pagination | 14 p.: fig. |
| Date Published | 1991-01-01 |
| Publisher | UNICEF |
| Place Published | Copenhagen, Denmark |
| Keywords | aquifers, hand pumps, models, testing, well yield |
| Abstract | The Step Draw-Down Pumping Test (SDT) was developed by Jacob to determine aquifer transmissivity and well properties in cases where the standard method is inapplicable, for example, the absence of observation wells. The suggested field procedure for a complete well test is to first carry out an air-lift pumping test, then a 1-hour discharge test, then the SDT, then the recovery test. The SDT consists of 4 to 5 pumping stages of 30 to 120 minutes each. These are plotted logarithmically and evaluated according to the procedures outlined in the report. Two sets of equations are presented, one for assumed laminar flow and one for assumed turbulent flow. |
| Custom 1 | 232.2 |
