Gannon Molumby - Runoff & Erosion Project_ Calculations

Procedure a. Calculate the area of each type of land cover. Land Cover Identifier Curve Number % total area Poor Condition Grass 79 8.89% Fair Condition Grass 69 29.50% Good Condition Grass 61 8.53% Impervious Areas 98 36.35% Paved; curbs and storm sewers 98 0.00% Paved; open ditches 89 0.00% Gravel 85 12.55% Dirt 82 4.18% Sums 100.00% b. Calculate the storage, S, and the initial abstraction, Ia S 2.150560184 Ia 0.4301120368 c. Calculate the runoff, Q (in inches) for each month in inches, cubic feet, and liters and put it in d. Calculate the Nitrogen and Phosphorus in the runoff each month. Remember to convert mg t Month Inches of Rain Runoff (inches) Jan 4.64 2.78646350894289 Feb 3.82 2.07408139156679 March 4.35 2.5312005426037 April 3.25 1.59980908954451 May 4.16 2.36581700404051 June 3.86 2.10809797525077 July 4.39 2.56621319800932 Aug 4.46 2.62764068383967 Sep 4.86 2.98215363566907 Oct 3.3 1.64054217468888 Nov 3.46 1.77209013751177 Dec 3.43 1.74729024243156 TOTAL 26.8013995840994

Soil Loss Calculation a. Find the rainfall energy factor R= b. Record the Erodability factor (K) from the figure. K= c. Calculate the slope-length factor length= slope= LS= d. Pick a suitable cropping factor and protection factor. C= e. Calculate the soil loss in tons/ha using the universal soil loss equation. f. Calculate the expected mass of soil loss in kg using the table below. Q1: Is there more nitrogen and phosphorus carried away in the water or in the sediment? Q2: What assumptions are you most unsure of? Q3: Name at least one thing that could be done on campus to Reduce Runoff Reduce Sediment Transfer away and more than 12 times as much phosphorus. hydrologic soil type they belonged to was quite difficult. creating denser bodies of grass can substantially reduce runoff.