.1 Foundation takes the priority
Infrastructure
Scheme I (raise the ground elevation to 12m)
Total investment
In the planned construction area, the total earthwork investment will be 2 billion yuan. Near-term investment
In the planned construction area, the earthwork investment in the near term will be 450 million yuan.
Scheme II (build a flood prevention dyke outside the area)
Total investment
Construction of a flood prevention dyke with a peripheral length of 130km around the planned area, and the associated gate stations and pump stations, with a total investment of 1.76 billion yuan.
15 gate stations will be required, and the flood drainage station capacity will be about 400cu.m/s.
Near-term investment
Construction of a flood prevention dyke with a peripheral length of 35km around the planned area in the near term, and the associated gate stations and pump stations, with a total investment of 430 million yuan.
5 gate stations will be required, and the flood drainage station capacity will be about 80cu.m/s.
Raise the ground elevation to 12m
Scheme I
Flood prevention dyke
Comparison of schemes
The two schemes require similar amount of investment
Scheme I (raise the ground elevation to 12m) provides good safety for flood prevention, and is good for water drainage from the area;
Scheme II (building flood prevention dyke) is not so safe in flood prevention and draining stagnated water, and pump stations will be needed, requiring complicated management, and the elevation in the area is low, not good to water drainage. Scheme I is recommended in the planning, to raise the ground elevation of the planned area to 12m.