Basin scale

Rivers

Dominant plant community type

Basin area (km²)

River-crossing structure

Water level change

Dam

Wear headworks

Hydraulic drop

(Jan 2006-Jul 2010)

①

②

③

④

⑤

Main river

Branch

Main river

Branch

a

b

c

large

Miya

IV

IV

−

+

II

920

2

1

4

Kushida

II

II

III

+

III

461

1

8

1

Kumozu

I

I

−

IV

III

550

1

5

9

1

Suzuka

+

I

−

II

V

323

10

5

Small

Shinbori

VI

+

+

−

−

6.3

1

2

Shio

−

VI

I

+

+

37.3

16

21

Tanaka

+

IV

+

IV

I

8.5

6

1

Harai

+

V

I

I

III

15.2

1

Dominant community type

Component rate of the area (%)

① Annual salt marsh plant community

+

0% - 5%

② Perennial salt marsh plant community (flooding type at tidal flat)

I

5% - 10%

③ Perennial salt marsh plant community (non-flooding type at tidal flat)

II

10% - 20%

④ Coastal plant community

III

20% - 40%

⑤ Land∙exotic plant community

IV

40% - 60%

Water level change

V

60% - 80%

a) Germination period (Mar-May)

VI

80% - 100%

b) Growth period (Jun-Oct)

−

No communication

c) Wintering period (Nov-Feb)