A new updated report has been released detailing the risk of earthquake-induced liquefaction in Hawke’s Bay. The report gives greater insight into how properties may be affected in the event of an earthquake. Since 1840, Liquefaction effects have been reported during four of the seven earthquakes having produced ‘strong shaking’ in Hawke’s Bay (Hawke’s Bay Civil Defence, 2017). There are areas of Hawke’s Bay underlain by potentially liquefiable soils, and there are several earthquake faults within or near the area capable of generating strong earthquakes. Low lying areas of Hawke’s Bays, particularly near the coast, and reclaimed land are particularly susceptible to liquefaction. The 2017 report refines previous work being more specific and is a worthwhile reference for property owners, tenants, developers and investors concerned with potential seismic risks. The report is available here and a FAQ sheet available here. Councils are currently reviewing the updated hazard information and how it will be incorporated into building and resource consent applications and District plans. The Hawke’s Bay Civil Defence Emergency Management Group in conjunction with the region’s five Councils commissioned the GNS Science report, which builds upon the historic GNS Liquefaction study carried out in the Hawke’s Bay region in 1999. The report concludes that there is little change in mapped liquefaction susceptibility to Wairoa, Napier, Hastings, and Havelock North with a reduction in the mapped liquefaction hazard in parts of Taradale and a significant reduction in the hazard assessed in Central Hawkes Bay. Liquefaction has been widely recognized as one of the principle earthquake hazards (Department of Civil Engineering, Universirty of Canterbuy, 2014). ‘Liquefaction is the process where, during earthquake shaking, sand and silt grains in wet soil are rearranged and the water in the spaces between the grains is squeezed. Pressure builds up until the silt and sand grains float in the water, and the soil behaves more like a liquid than a solid. The pressurized water is forced up to the ground surface through the easiest path it can find – often through cracks and crevasses in the ground or concrete. The water takes silt and sand with it, forming boils or volcanoes. The ground surface above liquefied soil often tilts and sinks.’ (ECAN, 2017) As a result of earthquake induced liquefaction, buildings, roads, pipes and other associated infrastructure can be damaged by the tilting or sinking of the ground. ‘Lessons learned about liquefaction after the Canterbury earthquakes has allowed scientists to significantly refine and improve existing liquefaction susceptibility maps for the Hawke’s Bay region, using existing geological, geomorphological, groundwater and geotechnical conditions’ (Hawkes Bay Emergency Management, 2017). The report noted that liquefaction effects had been reported in the Hawke’s Bay during historical earthquake events with ‘ground damage including sand boils, water ejection, subsidence and fissuring and lateral spreading’ (New Zealand Herald, 2017). Hawke’s Bay is considered one of the most seismically active, with several large and damaging earthquakes having occurred since records began. ‘Hawkes Bay is located on the Australian Plate, about 150km west of the Hikurangi Trough, which marks the … Read more
There are approximately 860 properties in Central Hawkes Bay that still require a completed Farm Plan by 31 May 2018 in order the meet the requirements under the Tuki Tuki Plan Change. The deadline of 31 May 2018 is quickly approaching, with just over 6 months left to go, the Hawkes Bay Regional Council is advising that financial penalties will be imposed if land owners have not completed a Farm Plan by this deadline. Our advice to farmers is to not put this off, nutrient management regulations are a tool used by Regional Councils to meet their responsibilities imposed by the Resource Management Act and are being rolled out nationwide, so this is not something that will go away. Hayley Mortleman and Jay Sorensen are fully qualified to undertaken Nutrient Budgeting and Farm Environmental Management Plans, and have completed a number of Farm Plans for clients within the Tukituki Catchment. Both Registered Rural Valuers, Hayley and Jay have extensive knowledge and understanding of both farming systems and nutrient management implications, a diverse rural support network and a strong connection with the land. “We want to work with you to develop a farm plan that not only complies with the plan change requirements, but also works for you in the long run providing practical, workable and affordable solutions and strategies for your farming enterprise” If you have any Farm Environmental Management Plan questions or require any no obligation advice, please contact Hayley or Jay at Logan Stone Ltd, Hastings.
Water is a finite resource. While it appears to flow endlessly down our rivers, and is pumped perpetually from the ground, there is only so much to go around. Effective management of our water resource is vital to ensure its benefits can be fully captured to optimise the productivity of our land, and ensure New Zealand maintains its clean green image. A large amount of legislation has been introduced from both Central Government and Regional Councils to ensure the quality of our waterways are maintained or improved. There is some belief that these imposed standards are not tough enough, however these rules need to be balanced to ensure land use practices remain sustainable, not only from an environmental perspective but also from a financial and productive standpoint. From a financial perspective, if the land is not profitable, land owners will have no capital to invest in their properties ensuring rules such as fencing waterways, are complied with. From a productive perspective, it is paramount that we produce enough food to feed our expanding population. There is a growing disconnect between the urban population and the land; policy setting needs to address protection and enhancement of our water resources, but we also need to be realistic and understand that food does not simply just appear in the supermarket. Most farmers and growers see themselves as custodians of the land, and are extremely proud and passionate about their properties. The majority are also farming for future generations and do not want to see a deterioration of water quality over their lifetime. It’s also true that most farmers are not nutrient specialists, relying instead on recommendations for nutrient inputs to ensure productivity is maintained or enhanced, and excess nutrients are not lost into waterways. The introduction of Regional Plans means that farmers will have a better understanding of the way nutrients move through their property, which should have both financial and environmental benefits. These plans do come at a cost, but this needs to be weighed against the long-term image of land based practices within this country. New Zealanders want to improve water quality, and this needs to be a collaborative effort throughout a varied range of industries and communities. Regional Plans will also introduce tougher rules around low flow levels in our streams and rivers, with water takes being tightly monitored to ensure a better allocation of our finite water resource. Resource Consents for water takes are likely to become more valuable, especially for properties in water-short areas. Various water catchments within Hawke’s Bay are currently in a ‘fully allocated’ or ‘over-allocated’ state. This includes the Tukituki, Karamu and Ngaruroro catchments. Land owners of properties in these areas should be very aware of their Resource Consent limits, ensuring they manage their water efficiently. There is a risk in these areas that if you are not using your full water allocation, your allocation may be reduced back to a level aligning with actual water usage, which could impact the future land use of … Read more