Full ecoregional plan - Conservation Gateway

13 and 14 split from 15-17 primarily due to elevation as 13,14 have significant amounts of highand some very high elevation areas. 13 split from 14 because 13 is primarily acidic granitic and14 is acidic sedimentary. Both are similar in landform. 15 and 16 split from 17 because 15 and16 have calcareous or moderately calcareous bedrock and 17 is primarily acidic sedimentary. 15split from 16 as 16 is more strongly calcareous and 16 has more steep slopes.Saco/Merrimack/Charles18,19,20,23 split from 21,22,24 because 21,22,24 were coastal low elevation systems while 18,19, 20, 23 had some moderate to high elevation areas and were inland. 19 split from 18, 20, 23 as19 was the only system primarily in the high elevation zone, with even some areas of very highelevation. 18 split from 20 and 23 as 18 was more dominantly acidic granitic and drain directlyto east coast Maine while 20 and 23 are more mixed acidic granitic and acidic sedimentary anddrain to the Merrimack River. 20 split from 23 due to 23 being more southerly and includingmore low elevation and gentle slopes. 24 split from 21 and 22 as 24 was extremely flat while 21and 23 were hilly. 21 split from 22 as 21 was flatter and flowed directly into the ocean or estuarybays without going through a size 3 river.Cape CodThere were only 5 size 2 examples in the Cape Cod EDU. They were all so similar in physicalsetting, the decision was made not to split them into further system classes.Figure 5: Size 3 System TWINSPAN SplitsSize 3 Watershed TWINSPAN Splits712 1419515 16 13 1898 1 10 1146 172 3REVISED 6/2003AQUA-RESULTS-14