235 



ATT AL HAIl M'\ A 



ATTACHMENT A 

 HOW MUCH TIMBER IS RETAINED BY A 1 00 FOOT BUFFER STRIP' 



At the request of the Riparian Group working on the Revision of the State Forest Practice Act, 

 the US Forest Service provided information on the effect of 1 00 toot buffer in a sample 

 drainage On a representative drainage on Prince of Wales Island, the effect of a 1 00 foot 

 stream Duffer around every visible stream was as follows- 



This data is graphically diplayed below 

 Effect of 1 00' Buffers on Timber- 1 08,3 1 9 acre drainage 



High Vol.0 6. 

 Med Vol 6 

 Low Vol. 0.6. 

 Young 6rowth 

 Non Prod Fores 

 Non Forest 



 Acres 



□ Acres in Buffer 



10000 20000 30000 40000 50000 

 Acres 



This scenario does not include 1 00 foot buffers around intermittent streams. However it does 

 include 1 00 foot around visible tributaries that may be considered a Class 1 1 1 stream when in 

 the field, hence limiting this scenario to only Class I and 1 1 streams would result In less than 

 9% timber retention for fish habitat. If one looks at the distribution of timber retained in 1 00 

 foot buffer strips, only 1 0% of the timber left is high volume old growth timber , the timber 

 which drives the economics of timber sales. The distribution of timber types and volumes that 

 would be retained Inside a 1 00 foot buffer is graphically depicted on the following page 



