| Impact ID | 8007 |
| Impact Type | Infrastructure |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Large communities of Glyceria maxima (reed manna grass) can impede water flow, alter hydrology, and even restrict access to natural waterways and irrigation or drainage channels. In Tasmania, populations of G. maxima have created so much additional silt (from reduced water flow) that shallow dams have become useless. |
| Reference | 25474 |
| Cost | |
| Location | Tasmania |