Annex V of Resolution 411/09 – Studies for Determining the Volumetric Yield Coefficient of Commercial Log in Sawn Timber Valid for a Coefficient Lower than the One Laid in Annex II



Present a roadmap for determining the volumetric yield coefficient, in order to increase the weighting established by this Resolution, for the transformation of commercial sawn timber.


The volumetric yield coefficient -CRV determined by this Resolution will be adopted by the competent environmental agency for the conversion of wood logs of tropical hardwood species in sawn timber. The CRV varies according to the species, the quality of the raw material, the type of manufacturing process, the level of industry’s technology, the type and quality of the final product, the realization of commercial use.

Due to the uniqueness in the establishment of a CRV that meets specifically all industries, this Resolution provides that the competent environmental agency can accept, through technical analysis, specific CRVs, provided that the applicant companies submit technical and scientific studies.

3. TECHNICAL ASSESSMENT METHODOLOGY 3.1 Characterization of the company
3.1.1 General information Industry name Geographical coordinates Postal address, telephone, fax and e-mail Name and function of contact person IBAMA Registry
3.1.2 Equipment

List the equipment (platform of logs, logs carriage, tape saw, multiple circular saw, circular saw, destopadeira. oven, plane and others), and the respective quantities, year of manufacture, power and other technical specifications.

3.1.3 products generated List the main final products produced in the last 12 months. List products of utilization produced and marketed by the company (pre-cut, short, plywood, packaging and other) within the past 12 months. List the products produced and consumed by the company over the past 12 months. List the types of waste generated and used by the company.

3.2 Cubage of logs processed
The information about the logs processed should be grouped into spreadsheets for each of the studied species. The worksheets for each species should be included in the ANNEX to the technical-scientific report presented.

3.2.1 Wood species
Identify the species studied by common and scientific name.
3.2.2 Size of logs Diameter: determine the cross diameters (larger and minor), without considering the shell at both ends of the log . Cubing log sheets must present the four values of diameters determined for each log, using the meter (m) as the unit of measure. Length: determine the smallest and largest length of log . These values should appear on the cubage sheets presented, using the meter (m) as the unit of measure.
3.2.3 Determining the volume of the log

The volume of logs must be determined by the geometric method, i.e. using using Smalian’s equation. It should be used to calculate the mean of the diameters and the average of the lengths.

3.3 Determining the volume of sawn timber

The information on the volume of sawn timber, obtained from the processed logs should be grouped into spreadsheets for each of the studied species. These worksheets should be included in the annex to the technical- scientific report presented.

3.3.1 Dimensions of items produced

For each sampled log, inform the dimensions (length, width and thickness) of items produced and the respective quantities.

3.3.2 Volume of sawn timber
For each sampled log, determine the volume of sawn timber obtained from the amount of items.
3.4 Determination of the volume of secondary or products for exploitation.
The products resulting from the processing of logs whose dimensions and quality does not meet the requirements for the main product, but they are marketed by the company should be considered products for exploitation.

3.4.1 Dimensions and volume of by-products or waste

For each sampled log, relate the dimensions (length, width and thickness), volume and quantities of products resulting from the primary processing that do not meet the requirements of the main product and the marketing of which is subject to verification.

3.5 Determination of the volumetric yield coefficient (CRV)

The CRV is determined by the ratio between the volume of logs processed and the volume obtained from sawn timber, plus, when applicable, the volume obtained with products for exploitation, provided they are properly marketed. It should be determined by the average of the CRV species determined individually for each log.

3.6 Coordination, supervision and conduct of work

The technical-scientific study should be signed by legally qualified professional with due note of technical responsibility and legal representative of the company.