2. General Rules Volume Two 2.9.6. Construction or placement of a temporary maimai or whitebait stand in, on or over the bed of a lake or river. 2.9.6.1. No more than 1m of lakebed or riverbed must be disturbed. 3 2.9.6.2. The maimai or stand must be open piled. 2.9.6.3. The maimai or stand must be located at least 50m from any other structure. 2.9.6.4. A maimai must be no more than 9m 2. 2.9.6.5. The maimai or stand must be constructed or placed and subsequently removed within the following periods: (a) a maimai must only be constructed or placed up to one week before, and removed no later than one week after, the official duck shooting season of the year of use; (b) a whitebait stand must only be constructed or placed after 1 August, and must be removed no later than 15 December, within any year. 2.9.7. Culvert installation in, on, under, or over the bed of a river. 2.9.7.1. A secondary flow path must be provided which enables overtopping floodwaters to return to the downstream channel without increasing the flood hazard to any person’s property not undertaking the culvert installation. 2.9.7.2. The culvert must be placed below the level of the riverbed by a distance equating to the diameter of the pipe divided by 5 (i.e., 20% of the culvert pipe) and at the same slope as the existing bed of the river. 2.9.7.3. There must be no increase in the velocity of flow through or downstream of the culvert at the river’s median flow. 2.9.7.4. The total length of the culvert must not exceed 8m, except for a culvert passing beneath a State Highway where the total length of the culvert must not exceed 20m. 2.9.7.5. The culvert installation must be designed and implemented to ensure there is no erosion or scour downstream of the culvert. 2.9.8. Minor upgrading in, on, or under the bed of a lake or river of the following utilities: (c) transmission line existing at 9 June 2016; (d) telecommunication or radio communication facility existing at 9 June 2016. 2.9.8.1. The utility must have been lawfully established. 2.9.8.2. The activity must not increase the plan or cross-sectional area of the utility by any more than 5% of the original utility. 2.9.8.3. There must be no significant change to the external appearance of the utility. 2.9.8.4. No greater than 10% of the cross-sectional area of the bed of a lake or river must be disturbed. 2.9.9. Livestock entering onto, or passing across, the bed of a river. 2.9.9.1. The entering onto or passing across the bed of a river of stock must not involve intensively farmed livestock if there is water flowing in the river. 2.9.9.2. After reasonable mixing, the entering onto or passing across the bed of a river by the livestock must not cause any conspicuous change in the colour or visual clarity of any flowing river, measured as follows: 2 – 14