Project Data Sheet

Project

Southern Water AMP5 DG5 Programme

Client Approximately 60 flooding locations investigated using hydraulic models across 24 different catchments within the Southern Water region during AMP5. Notional solutions were developed to remove the flooding. The solutions varied from small scale single pipe upsize to large scale upsize with offline tanks. For each flooding location the following modelling activities were undertaken: Value • Review existing model and prepare a fit for purpose assessment detailing any model upgrade work required. £95 k • Undertake model upgrade. • Develop notional options for each flooding location covering online upsize, flow transfer or diversions and offline storage. In some cases tidal influence was also assessed. • Prepare options report. • Recommend further model upgrade work if required including survey work.

Hydraulic Modelling 18.0 17.0 Blackbrook Business Park

16.0 Blackbrook Road

15.0

14.0 Tank sewer in Gudge Heath Lane Flood Risk & Planning Control 13.0 The Gillies Fareham CSO m AD m 12.0 Tank sewer in Paxton Road 11.0

10.0

9.0

GIS & Data ManagManageeeementment 8.0 E115_100 E115_110 E115_120 SU56063401 SU56064401 SU56064402 SU56065401 E115_135 MH04 MH05 MH06 MH07 MH08 SU56068101 SU56068206 GHL MH05 7.0 m 90 131 169 201 283 307 357 520 596 630 674 721 786 817 897 964 1057 1152 1234 1279 1313 1412 1445 1488 Link E115_090.1 ------E115_130.1 MH03.1 - - - MH07.1 - - - MH05 GHL.1 MH04 GHL.1 MH03 GHL.1 - - E115_240.1 - - length (m) 90.0 41.0 38.0 32.4 81.3 - 50.4 153.0 62.3 33.9 44.5 47.3 64.9 - 79.7 67.8 92.2 95.8 81.6 45.5 33.8 99.0 - 43.1 width (mm) 300 450 450 450 450 450 450 600 1200 1200 1200 1200 1200 - 450 3000 3000 3000 3000 1800 375 600 - 675 us inv (m AD) 16.270 - - - 14.245 - 13.160 12.000 10.000 - 9.898 9.851 9.801 - 9.510 8.500 8.436 8.350 8.260 8.183 - 8.110 - 7.190 ds inv (m AD) 15.100 - - - 13.430 - 12.187 11.590 9.934 - 9.851 9.801 9.733 - 9.480 8.436 8.350 8.260 8.183 8.140 - 7.770 - 7.070 pfc (m3/s) 0.111 0.248 0.196 - 0.286 - 0.398 0.316 1.227 - 1.227 1.227 1.227 - 0.055 8.111 8.111 8.111 8.111 4.253 - 0.358 - 0.439 Node ------E115_130 E115_135 - MH04 - MH06 MH07 - - - - MH05 GHL MH04 GHL MH03 GHL ------ground (m AD) - 17.610 - - 15.630 14.730 - - 14.170 12.950 - - - - 12.700 - - - - 12.020 12.410 12.750 12.180 - 10.450 10.900 - - Civil Engineering flood vol (m3) -1.0 -2.4 -3.2 -1.4 -1.3 -1.2 -1.4 - -1.6 -0.6 - -4.0 -4.5 -4.6 -5.2 -6.4 -2.8 -0.9 -8.5 -16.9 -21.2 -25.0 -18.7 - -1.1 -1.9 - -

The 24 catchments worked on were Peel Common, Budds Farm, East Worthing, , Bognor, Woolston, Wickham, , Brading, Morestead, , Thornham, Pagham, , South , Godshill, , East Meon, Shorwell, Liss, Billinghurst, Storrington, Pulborough and Henfield. Example Projects:Projects RES Environmental Ltd Example Projects Office 116 • Peel Common - Gudge Heath Lane & Blackbrook Road, developed large schemes to Westthorpe Business Innovation Centre resolve flooding - see images above. Westthorpe Fields Business Park • East Meon - rural village, new model built to Southern Water's AMP5 modelling Killamarsh Derbyshire specification, historically verified and notional solutions developed. S21 1TZ • East Worthing - solution development to remove 5 flooding locations. The influence of the tide in design events was assessed and modelled using joint probability. Tel 01142 180642 Fax 01142 180643 Budds Farm - Station Road - for this flooding driver an existing model was upgraded in the vicinity of Mainland and Cosham WPS. A new flow survey was installed comprising 11 flow www.res-env.co.uk and 9 depth monitors and the model verified to gain a better understanding of the interaction of Mainland and Cosham WPS and the tide on the Station Road flooding location. Using the newly verified model, options were then developed to remove the flooding. The interaction of Mainland and Cosham WPS includes a complex arrangement of penstocks, transfer lines, storms tanks, pumps which have been modelled using RTC.