The RMA is based on the principle of sustainable management whichinvolves considering effects of activities on the environment now andin the future when making resource management decisions.- Large scale hydro schemes have environmental impacts that must bemanaged/mitigated. These impacts means large scale hydro is quotedas being unlikely to be built in the future.- Project Aqua was a recent large hydro project that failed to proceed for anumber of reasons, with the RMA being cited as one of the issues