An-Najah National University

Faculty Of Engineering

Department Of Civil Engineering

HYDROLOGICAL Study for DESIGN AL MALEH DAM

Prepared By: MUHAMMAD SAADEH OSAMA ABU MUTAW’ AHMAD ABU KHADRAH

UNDER THE SUPERVISION OFDR. NUMAN MIZYD

Introduction

بقدرها } أودية فسالت ماء ماء الس من أنزلابيا ر زبدا يل الس الرعد (17) { فاحتمل سورة

IMPORTANT OF WATER.

Objectives

• Study the characteristics of the study area.

• Conduct a yield analysis for the watershed. • Establish a hydrological model using computer

software to estimate the design flood flow.

• Design the dam embankment.

Methodology

Project Define Objective

Data collections

Watershed Delineation

Watershed Characteristics

Yield Analysis

Statistical Analysis

Hydrological Model

Embankment Design

Spillway, outlet and stilling

basin DesignResults Recommendations

Data Collections

• previous studies• Ministry of Agriculture• Tubas Municipality• Meteorological Department

Study Area

WATERSHED DELINEATION

• DEM data. • GIS Software • Arc Hydro toolbar.• HEC-Geo HMS toolbar.

WATERSHED DELINEATION

Watershed Characteristicssub

basinArea (km2)

Stream Length

(m)

stream slope %

Distance from centroid to outlet

(m) Longest

flowpath (m)

CN

1 4.15 2490 4.86 1800 5500 77.15

2 2.08 1113 4.49 1300 3060 70.42

3 6.8 3742 1.68 1566 4500 72.45

4 1.37 1320 1.97 977 2400 70.16

6 3.65 3264 2.30 1846 4350 71.9

7 2.18 1223 4.82 1194 3770 71.04

8 1.88 425 3.76 1180 3000 77.06

9 3.29 2613 3.75 2290 4400 78.06

10 0.95 1317 1.97 1160 3250 79.11

11 1.85 224 0.89 790 2820 81.6

Yield AnalysisYear Average annual rainfall (mm) Runoff volume (m3)1990 316 8000001991 939.5 47500001992 465.5 15800001993 333.5 980001994 444.5 1260001995 378.5 5270001996 521.5 7000001997 514 6100001998 184.5 640001999 385.7 8000002000 266.1 110002001 501.5 6600002002 639.5 14000002003 322.5 150002004 436 10000002005 454 4250002006 372 510002007 325 3850002008 393 8650002009 440 450000

STATISTICAL ANALYSIS

-2.400 -2.000 -1.600 -1.200 -0.800 -0.400 0.000 0.400 0.800 1.2000.00

0.20

0.40

0.60

0.80

1.00

1.20

EmpericalNormal

Runof volumes

Com

ulati

ve P

ropa

pilit

y

Hydrological analysis

Hydrological analysisModel Parameter

• Sub basin• Junctions• Reach• Outlet (Sink)

Hydrological analysis

IDF Curve (100- Year)

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 4000.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

110.00

f(x) = 207.312788653497 x -0.47673755154584R² = 0.998565475539085

IDF Curve

duration ( min )

intin

sity

( mm

/hr )

Design Flood Flow

Resulted Hydrograph at Outlet

Flood Routing for Reach 1

Embankment Design

Dam Dimensions

• Dam storage volume is 600000 CM.• Max. length for the dam is 170m.• Max. width of the dam is 103m.• Max. height of the dam is 15m.• Crest width is 6m.• Side slope for upstream is 3.5:1• Side slope for Downstream is 3:1

Dam Dimensions

0 200000 400000 600000125

130

135

140

145

150

155

Depth Volume Curve

Cumulative Volume (m3)

Elev

ation

0 20000 40000 60000 80000125

130

135

140

145

150

155

Depth Area Curve

Cumulative area (m2)

Elev

ation

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0125

130

135

140

145

150

155

Depth Discharge Curve

discharge ( m3/s)

Elev

ation

Dam Layers

1 Central Core ( impervious , compacted clay )

2 Downstream ( pervious material )

3 Upstream ( pervious material )4 Foundation ( impervious rock foundation )

5 Cutoff trench ( 3m width , 1:1 side slope )6 Gravel layer ( 0.5 m )

7 Sand drain filter ( 2 m )

Spillway Design(spillway layout)

Spillway Profile

Spillway Geometry

• Q = 1.7 B H1.5 • C (discharge coefficient) is 1.7 • B (width of spillway) is 10m • H (design head) is 2.4m• The length of spillway is 250m• Elevation Difference is 30m

Stilling basin Design

• Stilling basin length is 55m• Water depth before stilling is 0.5m• Water depth after hydraulic jump is 13m

Outlet Design

• Pipe diameter is 12inch.• Pipe slope is 2%.• Pipe capacity is 0.58 m3 / s.

Outlet Design

Recommendations• Geotechnical study • Geophysical survey • Environmental study• Cost analysis study• Water quality studies

For Your Attention