9227 4TH AVE W 2024-08-12 - Laserfiche WebLink

REPORT SUMMARY DRAINAGE INFORMATION SUMMARY FORM Project Total Area: 0.35 of an acre Project Development Area: 0.35 of an acre Number of Lots (if applies): 1 Summary Table Drainage Basin Information Individual Basin Information A B C D On-Site Sub-basin Area (acres) 0.35 Type of Storage Proposed N/A Approx. Live Storage Volume (cu. ft.) Approx. Dead Storage Volume (cu. ft.) N A Soil Type(s) (Natural Resource Conservation C Service) Pre-developed Runoff Rates Q (cfs.) 2 yr. 0. 040227 10 yr. 0.092572 100 yr. 0.19738 Redevelopment Area Post-development Runoff Rates Q (cfs.) 2 yr. 0. 079379 10 yr. 0.143832 100 yr. 0.25587 Existing Conditions Summary: The site is located at 9227 41h Ave. W., Everett, WA 98204 in Snohomish County, and in NW 1/4 SE 1/4 Section 13, Township 28N., Range 4E, Willamette Meridian. See Figure 1 - Vicinity Map. The entire property consists of one lot totaling 0.35 acres. Approximately 0.2676 acres will be disturbed for this project. Land use around the site is primarily single-family. There is an existing single family home structure and a detached garage to be demolished and removed. Access to the duplex will be through a new improved driveway in the same location as the exiting driveway from 4th Ave W. The existing site consist of one lot that is trapezoidal in shape with an average dimension running east west of 235 feet and average width running north south of 63 feet. The grades on the site are almost flat (1% to 2%) sloped toward the southeast away from the proposed building structure. Terrain on the portion of the site to be disturbed is sloped moderately with slopes ranging from 1%-2%. The vegetation found on the existing property mainly consists of landscaping mostly lawn. Drainage Report—9227 4th Ave W Everett,WA 98204 Nov. 10,2022 Page 7