Ordinance 2213-97 - Laserfiche WebLink

Table 4-1 Summary of Potential Wetland Mitigations by Basin Basin Potential for Potential for Potential for Enhancement of Enhancement of Water Enhancement of Habitat Hydrological Support, Quality Control Functions Flood/Storm Water Functions Control Functions Big Gulch Basin Yes-Create check dams to pond Yes-Measures recommended for Yes but limited-Scrub/Shrub water for B27-30 and BG16a,b,c previous function should be enhancement on BG 16a,b,c(also implemented buffer plantings)and BG28,30 and coniferous plantings on BG28,30. Japanese Gulch Little potential on existing Little potential-Raise the outlet Yes but limited mainly to replanting Basin wetlands-already performing at elevation for JG 7 and 10 the riparian buffer along the middle high level and lower reaches of Japanese Gulch Creek. Edgewater Creek Yes-enhancement and creation of Yes-raise the outlet elevation of Yes-habitat structure for EC3 would this function in the upper EC3 be improved through additional watershed flooding recommended under water quality control function. Powder Mill Gulch Limited because of extent of Limited because of extent of Limited-enhance habitat in PM 11, development in upper basin, development. Increase height of 15,and 16 through coniferous and Increase height of outlet on PM18 outlet on PM18 scrub/shrub plantings and additional to increase flood and stormwater buffer plantings. control. Narbeck Creek Yes-Create and enhance wetland Yes-Create and enhance wetland Yes-Create and enhance wetland north of Narbeck Swamp(NC6) north of Narbeck Swamp(NC6) north of Narbeck Swamp(NC6). Control cutting of forested slopes in Narbeck Creek and replant with more diverse coniferous species. Other wetlands in the upper watershed such as 7 and 8a,b,c have limited biological significance. Merrill and Ring Yes-raise the outlet elevation or Yes-Same recommendations as for Limited-most of the degraded Creek berm the outlets of MR5 to 8. the Flood/Storm water control wetlands in the upper watershed Create wetland within ravine north function. Also consider raising the (MR2 to 8)are isolated,near major of Upper Ridge Road and adjacent outlet elevation of MR9(without roadways,and have limited biological to Hardeson Road by raising the affecting fish passage). significance. MR6 can be outlet elevation. Create additional expanded/enhanced to create much wetland at MR6. more diverse habitat. Phillips Creek Basin Yes-create additional wetland by Yes-raise the outlet elevation of None identified raising the outlet elevation of PHC1 PHC1 Glenwood Creek Yes-Infiltration function presently Yes-Water quality treatment Yes-Enhance GC2,4,5,and 7 with Basin occurring in Associated Sand and function provided by infiltration at scrub/shrub,forested and buffer Gravel operation must be sand and gravel operation must be plantings. Create more diverse maintained when operation closes maintained in order to protect high wetland habitat structure in GC9 by in future. performing downstream wetland removing fill. functions. Increase flooding in GC9 (without affecting fish passage). Glenhaven Creek Little Potential Little Potential Little Potential Basin Pigeon Creek#2 Yes-Maintain infiltration function Yes-Maintain infiltration function Yes-Create more diverse emergent, provided by Associated Sand and provided by Associated Sand and scrub/shrub and forested wetland by Gravel operation in upper Gravel in upper watershed. restoring PC2(remove sediment, watershed. Remove sediment Remove sediment from PC2 and create open water). Create more from PC2 and raise the outlet raise the outlet elevation. Raise the diverse habitat by expanding and 28