The watershed shown in the figure below is located in Bowling Green, Kentucky (western Kentucky).Â Â The entire...

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Civil Engineering

The watershed shown in the figure below is located in BowlingGreen, Kentucky (western Kentucky).Â Â The entire watershedis 100 acres in size and is predominantly forested (woods in goodcondition) before mining begins.Â Â The soils are Macomber(HSG C) and Saragosa (HSG B) with about 50% of the entire watershedin each. These soil types do not change when mininghappens.Â Â One seam of coal is to be surface mined asindicated in the figure below (hatched area), with this strip mineland-use being considered â€œcultivated land without conservationtreatment.â€Â Â The remaining non-mined land use remains asforested. Please feel free to treat the mining strip (hatched) areaas a rectangle with the width 180 ft and length 4500 ft (18.6acres).
(2.5 points) Calculate the Curve Number for the BeforeMining watershed condition
(2.5 points) Determine how much of the rainfall fallingon this before mining watershed would be removed as initialabstractions.Â Â
(2.5 points) Calculate the Curve Number for the AfterMining watershed condition.
(2.5 points) Determine how much of the rainfall fallingon this after mining watershed would be removed as initialabstractions.Â Â

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3.9 Ratings (697 Votes)

Ans a Before mining condition According to NRCS TR55 methodCurve number for HSG B soil with woods in good condition 55Curve number for HSG C soil with woods in goodcondition 70Averge CN 05055 05070 See Answer

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