For a 900-acre watershed with a time of concentration of 4.5 hrs, determine the triangular and curvilinear UHs using the Soil Conservation Service (SCS) Method. Plot both UHs.

Rational Method: Determine the pre (C = 0.3) and post development (C= 0.75) peak runoff for a 90-acre site that experiences a 0.35 inches/hour rainfall intensity, using the rational method. Show all your work, including any assumptions you will make.

A watershed is 30% meadow (good condition) and 70% commercial and business areas (85% impervious). The watershed has 50% soil group C and 50% soil group D. Calculate the weighted Curve Number for the whole watershed. (CN for different land uses and Hydrologic Soil Groups are provided in the table below (Table 2-1 of the textbook)). Land Use Description Cultivated land¹ Without conservation treatment With conservation treatment Pasture or range land Poor condition Good condition Meadow Good condition Wood or forest land Thin stand, poor cover, no mulch Good cover² Open spaces, lawns, parks, golf courses, cemeteries, etc. Good condition: grass cover on 75% or more of the area Eric Fair condition: grass cover on 50%-75% of the area Commercial and business areas (85% impervious) Industrial districts (72% impervious) Residential³ Average lot size 1/8 ac or less 1/4 ac 1/3 ac 1/2 ac 1 1 ac Paved parking lots, roofs, driveways, etc.5 Streets and roads Paved with curbs and storm sewers Gravel…

Different steps of watershed modeling are provided in the options below. Select the option that is related to the last steps of the watershed modeling. O Evaluation and refinement of study objectives Sensitivity analysis, and usefulness evaluation Model selection, and input data gathering O Method selection, and model calibration