Compute the runoff from a 5-in. rainfall from a watershed which has four soil groups overall and the land cover is fair grass cover. Also, estimate the effect of urbanization if the land cover changed into four urban categories as shown below: Land Use Land use Soil Group CN CN Before Urbanization After urbanization Before Urbanization After Urbanization Grass Residential 40% C 79 83 Grass Grass 25% D 83 80 Grass Commercial C 79 94 20% Grass Industrial 15% D 83 93

A small watershed has four rain gauging stations. During a particularstorm event, these four rain gauging stations W, X, Y and Z recorded 28.4mm,24.9mm, 31.6mm and 29.8mm of precipitations respectively. As shown in thefigure, segment formed by connecting stations W & Z is the perpendicularbisector of the segment formed from stations X & Y and vice versa. Determinethe areal average precipitation for this watershed using the (i) Thiessen Polygon Method

Calculate a 30 minute SCS triangular unit hydrograph for a watershed of area 550 ha and time of concentrationof 50 minute and draw a triangualar unit hydrograph.

a drainage basin with an area of 5 km2 receives 25 mm ofrainfall. The losses due to interception and evaporation during the rainfall event amountis 5 mm. There is also some surface runoff. There is 2% of the rain falls directly falls intothe stream as channel precipitation. A very large part of the rainfall infiltrates into thesoil. The amount of 40000 m3 of volume of water discharges at the out let of thewatershed, where 75% of this amount is baseflow. What is the runoff coefficient (%)?Hint (Runoff coefficient is surface runoff/precipitation)

WATER RESOURCES ENGINEERING: The ordinates a one-hour intervals of a unit hydrograph are 350.2, 753.2, 1556.0, 1980.1, and 224.3 cfs/in. Determine the direct runoff hydrograph from a three-hour storm in which 0.6 inches of rainfall excess occurred in the first hour, 1.3 inches in the second hour, and 0.3 inches in the third hour. What is the watershed area in mi2?

If the annual precipitation is 114 cm/yr, the land area is 13,289 m2, and the runoff coefficient is 0.4, what is the storm water runoff from this land area? (in m3/d with 2 decimal points)

Calculate the runoff from a watershed of (0.01 x 4737) ha. The following data are available: Depth of rainfall is 100 mm. Antecedent rainfall condition, AMC 1: Row crop, good condition in 40 ha (Soil group C) Woodland, good condition in 20 ha (Soil group B) The day after the rainfall of 100 mm, another rainfall of 50 mm occurred. Solve for the surface runoff from the watershed. [ NOTE: Where R is the last four digits of your Registration Number. R = 4737 ]

A small catchment area 300 km2received a rainfall of 15cm in 1 hour, due to a storm draining thecatchment was dry before the storm and experienced a runoff lasting for 5 hours with an averagedischarge Value of 3 m3/sec. The stream was given dry after the runoff event.(a) What is the amount of water in cm3 which was not available to runoff alone to combined effectof infiltration, evaporation and transpiration.(b) What is the ratio of total and direct runoff to precipitation.

3 hr unit hydrograph - (t(hr),q(m3/s)) : (0,0) , (1,0) , (2,13.3) , ( 3,56.6) , (4,129.6) , (5,166.3) , (6,163) , (7, 116.6) , (8,80) , (9,45) ,(10,18.3) Use the 3-hr hydrograph to develop the watershed response to the following storm T (hr) P (cm): (0 – 3, 3)( 3 – 6, 6) (6 - 9, 4.5)

R The following table show the precipitation in (mm/hr.) observed at the rain gages (A, B, and C) which shown in figure belo 1. Find the average precipitation each hr. over the catchment by Thiessen method . 2. Draw a graphical relation between the average precipitation each hr. and the time. - 3. Find the (& and W- index), if the runoff volume=104.4 cm.km® thr.) 1 2 3 a 5 Rain gage A 5 | [45 [ | & 8 3 7 [35 = [ 2 % a 9 |20 | 12 | & ain gage c i 10km rain gage - ain gge 106m