Forest Practices Code, Province of B.C.

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Coastal Watershed Assessment Procedure Guidebook (CWAP)

This Forest Practices Code Guidebook is presented for information only

It is not cited in regulation. The Forest and Range Practices Act and its regulations took effect on Jan. 31, 2004. This replaced the Forest Practices Code of British Columbia Act and regulations. For further information please see the Forest and Range Practices Act.

This guidebook was superceded by the following 1999 Watershed Assessment Procedure Guidebook available at: /tasb/legsregs/fpc/FPCGUIDE/wap/WAPGdbk-Web.pdf  

Level 1 Analysis

August 1995


Authority

Forest Practices Code of British Columbia Act

Operational Planning Regulation
Part 3 (Forest Development Plans)


Table of Contents

Introduction

Overview of the watershed assessment procedure
When to do a watershed assessment

The CWAP procedure

The multi-agency round table
Level 1 analysis
Level 2 and 3 analyses
Developing watershed constraints for the forest development plan

The level 1 analysis procedure

Map work
Data compilation
Peak flow
Surface erosion
Riparian buffers
Landslides
Headwaters
Watershed characteristics
CWAP conversion table
Watershed report card

Interpretations and recommendations

Determining hazard index scores
Level 2 watershed assessment (channel assessment)
Air photograph analysis
Field assessments
Making interpretations and recommendations
Interpretation matrices
Interpretation worksheet

Appendices

  1. Compilation of data sources needed to complete the CWAP
  2. Identification of stream orders, sub-basins, and the point of interest in community watersheds
  3. Definition of unstable slopes and those with a potential for landsliding
  4. Definition of areas with a potential for surface erosion
  5. Forestry impacts on stream flow and directions on calculating equivalent clearcut area (ECA)
  6. Forestry impacts on surface erosion and directions on filling in the surface erosion and road inventory forms
  7. Forestry impacts on floodplains and riparian zones and directions on filling in the riparian forms
  8. Forestry impacts on landslides and directions on filling in the unstable terrain forms
  9. Hydrological zone map
  10. Headwaters
  11. Classification of bedrock geology
  12. Computer spreadsheet version of the CWAP (excel spreadsheet no longer available).

List of figures

  1. Flowchart for completing a watershed assessment procedure

List of tables

  1. Coastal watershed assessment conversion table

List of forms

  1. Area measurements by elevation band and sub-basin
  2. Peak flow index calculations by sub-basin
  3. Road inventory and density
  4. Roads adjacent to streams
  5. Riparian buffer impacts
  6. Landslide hazard
  7. Headwaters
  8. Watershed characteristics by sub-basin
  9. Watershed characteristics by sub-basin
  10. Watershed report card
  11. Hazard index

List of matrices

  1. Peak flow vs. channel instability
  2. Peak flow vs. surface erosion
  3. Peak flow vs. landslide
  4. Landslide vs. channel instability
  5. Riparian vs. channel instability
  6. Headwaters vs. channel instability
  7. Headwaters vs. peak flow

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