Managem ent Process for Realization of River Basin Control tow ards - - PowerPoint PPT Presentation

▶
managem ent process for realization of river basin
SMART_READER_LITE
LIVE PREVIEW

Managem ent Process for Realization of River Basin Control tow ards - - PowerPoint PPT Presentation

Aug 30, 2022 137 likes •553 views

Managem ent Process for Realization of River Basin Control tow ards the Creation of the Urbanized Hydrological System to be W ell-balanced Asian Science and Technology Sem inar ( ASTS) in Thailand March 1 1 , 2 0 0 8 Masahiro I m be

slide-1
SLIDE 1

1

Managem ent Process for Realization

  • f River Basin Control

tow ards the Creation of the Urbanized Hydrological System to be W ell-balanced

Masahiro I m be Association for Rainwater Storage and Infiltration Technology ( ARSI T)

Asian Science and Technology Sem inar ( ASTS) in Thailand March 1 1 , 2 0 0 8

A R S I T

slide-2
SLIDE 2

2

Outline of this Presentation

Introduction Outline of Study Area Feature of Master Plan Development of Procedure for Action Plan Future Aspects Conclusions

slide-3
SLIDE 3

3

Impact on Hydrological System in Urban Areas

Urbanization

Expansion of urban area Improvement of lifestyles High population density High grade of land utilization

Impact on hydrological system

Expansion of impermeable area Increase in water demand Increase in waste water Reduction of water areas and green spaces

Introduction

slide-4
SLIDE 4

4

Location of Study Area

slide-5
SLIDE 5

5

Outline of Shingasi River Basin

runs from north-west to south-east into Tokyo Bay has been urbanized since the 1960s Basin area : 390 km2 River length : 34.6km Population : 2,440,000 (As of 2003) Ratio of Urbanization Area

13% in 1961 increase to be 49% in 2002

Ratio of Sewerage Propagation : 89.6% in 2002

slide-6
SLIDE 6

6

Extraction of Problems in Shingasi River Basin Contour lines of unconfined groundwater level and saturated hydraulic conductvities

slide-7
SLIDE 7

7

Subjected Items of Analysis

Evaporation Precipitation Evaporation Water Supply Surface Runoff River Irrigation Sewerage Well Unconfined Aquifer Artesian Aquifer Un-saturated Layer Pressurized Layer

slide-8
SLIDE 8

8

Extraction of Problems in Shingasi River Basin

Physically based distributed model Surface Runoff: 1D Kinematic Wave Infiltration: Unsaturated Flow (Richards Equation) Groundwater Flow: Darcy’s Law Evapotranspiration: Harmon’s Empirical Formula

River

slide-9
SLIDE 9

9

Extraction of Problems in Study Area

a.

Increase of flood volume

206 290 409 100 200 300 400 500 past present future (mm/yr)

annual direct runoff (Shingasi River)

(in 1945) (in 2025)

slide-10
SLIDE 10

10

Extraction of Problems in Study Area

b.

Increase of water demand

22 775 1,123

200 400 600 800 1,000 1,200

past present future (mm/yr)

annual water supply (Shingasi Basin)

(in 1945) (in 2025)

slide-11
SLIDE 11

11

Extraction of Problems in Study Area

c.

Deterioration of water quality

Water quality (BOD) of dominant rivers in Shingasi river basin

name

  • bservation

point

  • bserved

value(mg/ l) name

  • bservation

point

  • bserved

value(mg/ l) Furo River Furo Bridge 28.7 Asahi Bridge 9.1 Yanase River Sakae Bridge 11.2 Sasame Bridge 8 Kurome River Azuma Bridge 12 Shimo Bridge 6.4 Shirako River Ochiai Bridge 6.4 Shingasi River The target value recommended by the government is 10 mg/ l in this river basin)

slide-12
SLIDE 12

12

Extraction of Problems in Study Area

d.

Decrease of base runoff

24 217 61

50 100 150 200 250

past present future

(mm/yr)

annual base runoff

(Furo River) (in 1945) (in 2025)

slide-13
SLIDE 13

13

Extraction of Problems in Shingasi River Basin

e.

Decline of ground water level and dry-up of spring water

38.78 40.66 41.14

35 40 45 past present future (m)

average groundwater level(Shingasi Basin)

315 255 183

100 200 300 400 500 past present future (mm/yr)

annual spring water discharge (Shingasi Basin)

(in 1945) (in 1945) (in 2025) (in 2025)

slide-14
SLIDE 14

14

Extraction of Problems in Shingasi River Basin

f.

Change of climate

447 360 287

100 200 300 400 500 past present future (mm/yr)

annual evaporation (Shingasi Basin)

(1945) (2025)

slide-15
SLIDE 15

15

  • Problems in Shingasi River Basin
  • Increase of flood volume
  • Increase of water demand
  • Deterioration of water quality
  • Decrease of base runoff
  • Decline of groundwater level and dry-up
  • f spring water
  • Change of climate

Extraction of Problems in Shingasi River Basin

slide-16
SLIDE 16

16

An interim report

“How should the well-balanced hydrological system be in river basins.”

(the Sub-committee of Water Cycle, the River Council for river control ,July 1998)

com prehensive m aster plans should be drafted for urbanized areas Yanase River Basin (as a pilot project)

Introduction

slide-17
SLIDE 17

17

Outline of Study Area

The Yanase River Basin biggest tributary of the Shingashi River Basin runs north-west of Tokyo has been urbanized since the 1960s Basin area : 100km 2 River length: 27km Population: 222,000 in 1945 630,000 in 2003 Ratio of Urban Areas: 54.3% in 1994 Ratio of Sewerage Propagation: 60 % in 2000

slide-18
SLIDE 18

18

  • Photo image of Yanase River

Outline of Study Area

slide-19
SLIDE 19

19

  • Photo image of Yanase River

Confluence Point Main Flow from Left Yanase River from Right Low er Reach of Yanase Children having a fun Main Flow Yanase River

Outline of Study Area

slide-20
SLIDE 20

20

  • Photo image of Yanase River

Upper Reach of Yanase River Covered w ith Rich Green at Riverside

Outline of Study Area

slide-21
SLIDE 21

21

  • Photo image of Yanase River

Azum a River ( Tributary) Flow ing in the City Area Typical Deteriorated Condition of Urban River Azum a River Typical Conventional Revetm ent

Outline of Study Area

slide-22
SLIDE 22

22

The Master Plan

investigative committee ・ academic advisors ・ government officers ・ representative citizens

Feature of Master Plan

2000 2005 Master Plan Action Plan 200７

slide-23
SLIDE 23

23

Basic Concept and Policy Authorized for Master Plan

slide-24
SLIDE 24

24

Basic Concept and Policy Authorized for Master Plan

CONCEPT Conservation of Hydrological System deteriorated by Urbanization in terms of 1.Flood 2.Ordinary Flow 3.Underground Water and Spring Water 4.Water Quality which describes the well

  • balanced hydrological system

regarding water quantity and quality. Implementaion of Measures which succeed to the Future to make a well

  • balance of

Flood Control, Water Utilization and Aqua-Environment which describes the policy for practical measures to be done by governments and inhabitants . Involvement of Relevant People which pursue the cooperative society regarding water which describes the social activities such as education , clean up, festival, seminar etc. FUNDAMENTAL POLICY

slide-25
SLIDE 25

25

Basic Idea for Setting up Project Goal

Two types of viewpoints

Quantitative index

(Engineering approach)

Environmental condition

(understandable for ordinary inhabitants)

slide-26
SLIDE 26

26

Basic Idea for Setting up Project Goal

Setting up Image of Project Goal Investigation of Implemented or Planned Measures by Local Governments Detailed Procedure for Decision Making of Project Goal Setting up Measures to be Considered Numerical Simulation to estimate Effectiveness of Proposed Measures Setting up Quantitative Targets

Comparison

OK to Next Sheet No Good

Reconsideration

slide-27
SLIDE 27

27

Comparison

Proposition of Project Goal O.K. N.G.

Estimation of Necessity Possibility of Implementation

Consensus Building for Project Goal Target Values Measures Allotment of Responsibility O.K. N.G.

slide-28
SLIDE 28

28

Setting up the Image for Desirable River Basin

Project goal in Two conditions

For Flooding

river improvement plan by relevant local governments

For usual time

using the catchphrases and pictures

slide-29
SLIDE 29

29

Co-operative System for Drafting Master Plan

For building the consensus of the plan

slide-30
SLIDE 30

30

Co-operative System for Drafting Master Plan

For building the consensus of the plan

slide-31
SLIDE 31

31

Setting up the Image for Desirable River Basin

Catchphrase

Towards the river where children can get in and safely have a fun

Ex.

slide-32
SLIDE 32

32

Setting up the Image for Desirable River Basin

Catchphrase

Towards the river which tempts people to go fishing.

Ex.

slide-33
SLIDE 33

33

Setting up the Image for Desirable River Basin

Catchphrase

Towards the river where domestic species sensitive to environmental change can live

Ex.

slide-34
SLIDE 34

34

Subjected Items of Analysis

Evaporation Precipitation Evaporation Water Supply Surface Runoff River Irrigation Sewerage Well Unconfined Aquifer Artesian Aquifer Un-saturated Layer Pressurized Layer

slide-35
SLIDE 35

35

Setting up target values at check points and correlated fundamental measures

Evapotranspiration Water supply from another basin Conservation of agricultural land Infiltration facilities Rain water use Water reuse Conservation

  • f forest

Precipitation Surface runoff River channel improvements Sewage Sewage plant Ground water use Ground water use Discharge Discharge Discharge Paddy field

①Conservation of green zone and agricultural land ②Promotion of rainwater storage and infiltration facilities ③Implementation of sewerage system improvement

slide-36
SLIDE 36

36

Development of Procedure for Action Plan

Establishment of Promotion Council & Working Group Organized by Government Establishment of Promotion Council & Working Group Organized by Government

Formulation of Action Plan

Existing Measures Monitoring Program Newly Developed Program Discussion Session with Residents Discussion Session with Residents Election of Representatives Condition Assessment Progress Assessment Establishment of Investigative Sessions Trial Implementation at Model Areas Setting up of Citizen's Network Planning, Assessment on Monitoring and Establishment of New Session Planning, Assessment on Monitoring and Establishment of New Session Assessment of Master Plan and Action Plan and Review of Both Plans Assessment of Master Plan and Action Plan and Review of Both Plans

every year every 5 years Cooperation Opinion Opinion

slide-37
SLIDE 37

37

Future Aspects

Conservation of green zone and

agricultural land → Funding system

P u r c h a s e L

  • c

a l G

  • v

e r m e n t 1 G r e e n L a n d A g r i c u l t u r a l L a n d P u r c h a s e L

  • c

a l G

  • v

e r m e n t 1 L

  • c

a l G

  • v

e r m e n t 2 C i t i z e n s E n t e r p r i s e s G r e e n L a n d A g r i c u l t u r a l L a n d

slide-38
SLIDE 38

38

Future Aspects

Promotion of rainwater storage and

infiltration facilities → create the ordinance

slide-39
SLIDE 39

39

Conclusions & Future Subjects

Conclusion

indicates the investigative procedure

and consideration to draw up the Master plan and the Action plan

Future subjects – to make Action plans

understandable, reasonable, and sympathy Producing the positive activity of the

co-operative system in which local governments, inhabitants and companies get involved

slide-40
SLIDE 40

40

Thank you for your attention

A R S I T