div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Thurston County HomeSquare Feet of Parcel one acre = 43560 sq ft Percentage of Impervious Surface Coverage J Divided By K The Drainage Manual defines impervious surface src=https:reader033vdocumentsmxreader033viewer20220426015f67ebab7d4f3813a37d518dhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: Thurston County HomeSquare Feet of Parcel one acre = 43560 sq ft Percentage of Impervious Surface Coverage J Divided By K The Drainage Manual defines impervious surface src=https:reader033vdocumentsmxreader033viewer20220426015f67ebab7d4f3813a37d518dhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 3button div class=ts-image amp-img class=ts-thumb alt=Page 3: Thurston County HomeSquare Feet of Parcel one acre = 43560 sq ft Percentage of Impervious Surface Coverage J Divided By K The Drainage Manual defines impervious surface src=https:reader033vdocumentsmxreader033viewer20220426015f67ebab7d4f3813a37d518dhtml5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdiv