The northern sandy land wants to build a fish pond. Who can tell me how to be waterproof?

The construction and protection of fish ponds in high sandy soil areas have high sediment content and not thick loam on the surface. The fish ponds built by conventional methods are easy to collapse and have shallow siltation. In this regard, the following measures should be taken during excavation and daily protection. 1. 1 protective measures in fish pond excavation1.1gentle slope or step excavation is changed to 1: 2 ~ 2.5 gentle slope, slope ratio 1: 3 ~ 3.5, When the steps are excavated, the upper layer is medium soil, the excavation slope is1:1.5, and the depth is controlled at about 1.0 m, then a platform with a width of about 0.8 m is left, and then the excavation is carried out to a predetermined depth, and the slope ratio is1:2.5. The function of the platform is to prevent collapse, act as a dining table, and operate the walkway by pulling the net. 1. 1.2 slope protection method 1: excavate by conventional methods, then cover with non-woven fabric (geotextile) or green yarn and old fishing net, and then cover with concrete for compaction, with a thickness of about 30 cm. If the pool is surrounded by a field ridge, the middle ridge (partition ridge) can be excavated in steps, and then the woven bag is fixed by piling to tamp the soil to prevent collapse. Conditional can use cement precast slab or stone barge. 1. 1.3 The deep pond shall be silted according to the requirement that the water depth of high-yield fish pond is 2.5 ~ 3.0m, and the deep pond shall be used shallowly, that is, 3.5 ~ 4.0m shall be dug horizontally during excavation, and the water depth shall be controlled during use. In this way, even if there is a collapse, the appropriate water depth can still be maintained for several years. 1. 1.4 width: the top width of the bank along the river bank 10 ~15m, and the pond spacing is greater than10m. If there are slope protection measures in the middle ridge, the top width should be greater than 5 meters. 1.2 Planting green feed on the exposed slope ridge can not only solve some fish feed, but also reduce the damage of rainwater erosion to the pond ridge and reduce shallow pond sedimentation. 1.3 Add a downcomer at the water inlet, so as not to directly impact the slope, and the slope protection and oxygenation can kill two birds with one stone. 1.4 Adjust the culture structure to reduce the damage of fish foraging activities to the pond ridge. 1.5 Fish ponds are adjacent. When the pond dries up, the water level should be lowered simultaneously or gradually to prevent the water level from falling over the ridge, and more attention should be paid to the narrow fish pond in the middle ridge.