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<br /> <br /> <br /> <br /> <br /> <br />Table 2.4-1 LUC Values <br />Value Land Condition and Use <br />1 hay field (overland flow) <br />3 short grass pasture (overland flow) <br />5 compacted dirt roads (overland flow) <br />6 grassed waterway (concentrated flow) <br />7 paved area (gravel), and small upland drainages <br />8 diversion ditches <br />' 2.5 Hydrograph Response Shape <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br />Hydrograph response shapes reflect the rapidity that a watershed sheds water, rated in <br />SEDCAD+ as fast, medium, or slow. A slow response shape would correspond to a <br />forested area or an area with a lot of obstructions, while a fast response shape would <br />correspond to an unvegetated or poorly protected area. These ratings are for overland flow. <br />Once overland flow is surpassed, a fast rating is assigned. <br />Table 2.5-1 Hydrograph Response Shapes <br />Land Use Condition ~ Slopes s 2~% ~ Slopes > 2~% <br />hay field !slow (S) ~ not encountered <br />short grass pasture ~ slow ~ medium <br />graveled (paved) areas j medium (M) ~~ not encountered <br />compacted dirt roads fast (F) not encountered <br />grassed waterways (concentrated <br />tlow) ~ fast fast <br />upland drainages fast fast <br />diversion ditches fast fast <br />2.6 Crverland Flow <br />' Length of overland flow (sheet and rill drainage) is a direct input parameter for SEDCAD+ <br />sedimentology analyses, and has indirect influence on other parameters, such as LUC. <br />Estimated mardmum permissible lengths of overland flow are consistently applied in this <br />' analysis as presented in the Table 2.6-1. <br />' Page ~ of 34, 7 Oct 96 <br />