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<h4>2019</h4>
Portsmouth Water has no large raw water storage reservoirs.  It relies almost entirely upon groundwater reserves in the chalk aquifers of the South Downs and abstracts its raw water from wells, boreholes and springs.  It has one river abstraction at Gaters Mill on the River Itchen, a chalk river with a groundwater baseflow.

Those reserves rise and fall with the seasons and so Portsmouth Water pays particular attention to the local hydrogeological data by monitoring rainfall at its Havant Offices, groundwater levels in the chalk at Idsworth on the Hampshire/Sussex border, as well as the total yield from the natural springs at Havant and Bedhampton.

These resources are monitored on a daily basis and reported upon on a monthly basis.  The information here is therefore at times one month behind the most current situation.

The information gathered is reproduced here for information purposes; no guarantee is given as to its accuracy.

<em>The information provided in this section shows the Water Supply data for the 12 months from April to March. The monthly data for our resource levels can be found <a href="https://www.portsmouthwater.co.uk/category/water-supply-news/">here</a>.
</em>

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[divider height="30" style="none" line="default" themecolor="1"]

[accordion title="" open1st="0" openAll="0" style=""]

[accordion_item title="Rainfall"]

The weather during 2018/19 was typical of a ‘Dry Year’ with low rainfall in June and July.  Over the whole year rainfall was 87% of the long term average but rainfall in November and December was sufficient to ensure full groundwater recharge in January.

The graph below shows recorded rainfall as a blue bar and the Long Term Average (LTA) rainfall as a black line.

<a href="https://www.portsmouthwater.co.uk/wp-content/uploads/2018/07/havrain2017-8-1.png">
</a><a href="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/rainhav20189.png"><img class="aligncenter wp-image-9035 size-full" src="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/rainhav20189.png" alt="" width="667" height="411" /></a>

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[/accordion_item]

[accordion_item title="Groundwater Levels"]

The Company has monitored the groundwater level at Idsworth Well, Rowlands Castle, for many years since the well is unaffected by abstraction and is representative of groundwater conditions in the South Downs chalk.  Around 85% of Portsmouth Water’s abstractions are from underground sources and so groundwater levels are critical to maintaining supplies.

Groundwater in the local aquifer normally fluctuates approximately 9.5m between maximum and minimum annual levels. Groundwater levels were above the long term average at the start of 2018/19 but they fell to below average in November as a result of the dry summer. Rainfall in November and December resulted in a strong groundwater recovery. There was well below average rainfall in January but rainfall in February caused a second rise in ground water levels.

<a href="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/ids20189.png"><img class="aligncenter wp-image-9036 size-full" src="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/ids20189.png" alt="" width="669" height="475" /></a>

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[/accordion_item]

[accordion_item title="Abstraction"]
<p style="vertical-align: baseline; margin: 0cm 0cm 11.25pt 0cm;"><span style="font-size: 10.5pt; font-family: 'Arial',sans-serif; color: #424242;">Annual abstraction is drawn from three types of source: the River Itchen Works which treats surface water, boreholes and wells which abstract groundwater from the underground chalk, and Farlington Water Treatment Works which treats spring water from Havant and Bedhampton.</span></p>
<p style="vertical-align: baseline; margin: 0cm 0cm 11.25pt 0cm;"><span style="font-size: 10.5pt; font-family: 'Arial',sans-serif; color: #424242;">Abstraction from the Company’s sources in 2018/19 was as shown in the table below:</span></p>

<table width="531">
<tbody>
<tr>
<td rowspan="2" width="168">Source</td>
<td colspan="4" width="364">Annual Abstraction - Ml/Yr</td>
</tr>
<tr>
<td width="87">Source Licence</td>
<td width="101">Source Actual 2017/18</td>
<td width="87">Group Licence</td>
<td width="88">Group Actual 2016/17</td>
</tr>
<tr>
<td width="168">Northbrook</td>
<td width="87">7,487</td>
<td width="101">5,031</td>
<td rowspan="2" width="87">7,487</td>
<td rowspan="2" width="88">5,031</td>
</tr>
<tr>
<td width="168">Lower Upham</td>
<td width="87">640</td>
<td width="101">0</td>
</tr>
<tr>
<td width="168">West Street</td>
<td width="87">3,328</td>
<td width="101">556</td>
<td width="87"></td>
<td width="88"></td>
</tr>
<tr>
<td width="168">West Meon</td>
<td width="87">1660</td>
<td width="101">0</td>
<td width="87"></td>
<td width="88"></td>
</tr>
<tr>
<td width="168">River Itchen</td>
<td width="87">15,916</td>
<td width="101">10,702</td>
<td width="87"></td>
<td width="88"></td>
</tr>
<tr>
<td width="168">Maindell</td>
<td width="87">2,040</td>
<td width="101">0</td>
<td width="87"></td>
<td width="88"></td>
</tr>
<tr>
<td width="168">Soberton</td>
<td width="87">3,294</td>
<td width="101">616</td>
<td rowspan="2" width="87">3,294</td>
<td rowspan="2" width="88">619</td>
</tr>
<tr>
<td width="168">Newtown</td>
<td width="87">695</td>
<td width="101">3</td>
</tr>
<tr>
<td width="168">Worlds End</td>
<td width="87">8,296</td>
<td width="101">3,815</td>
<td width="87"></td>
<td width="88"></td>
</tr>
<tr>
<td width="168">Lovedean</td>
<td width="87">4,148</td>
<td width="101">1,583</td>
<td width="87"></td>
<td width="88"></td>
</tr>
<tr>
<td width="168">Havant &amp; Bedhampton</td>
<td width="87">35,770</td>
<td width="101">19,842</td>
<td width="87"></td>
<td width="88"></td>
</tr>
<tr>
<td width="168">Walderton</td>
<td width="87">9,955</td>
<td width="101">6,760</td>
<td rowspan="6" width="87">23,740</td>
<td rowspan="6" width="88">16,806</td>
</tr>
<tr>
<td width="168">Woodmancote</td>
<td width="87">1,103</td>
<td width="101">188</td>
</tr>
<tr>
<td width="168">Fishbourne</td>
<td width="87">3,741</td>
<td width="101">2,669</td>
</tr>
<tr>
<td width="168">Funtington</td>
<td width="87">2,920</td>
<td width="101">1,720</td>
</tr>
<tr>
<td width="168">Lavant</td>
<td rowspan="2" width="87">9,950</td>
<td width="101">4,198</td>
</tr>
<tr>
<td width="168">Brickkiln</td>
<td>1,271</td>
</tr>
<tr>
<td width="168">Eastergate</td>
<td rowspan="4" width="87">&nbsp;

&nbsp;

10358*

&nbsp;</td>
<td width="101">3,153</td>
<td rowspan="4" width="87">10,358</td>
<td rowspan="4" width="88">8,038</td>
</tr>
<tr>
<td width="168">Westergate</td>
<td width="101">2,083</td>
</tr>
<tr>
<td width="168">Slindon</td>
<td width="101">657</td>
</tr>
<tr>
<td width="168">Aldingbourne</td>
<td width="101">2,145</td>
</tr>
<tr>
<td width="168">Total</td>
<td width="87">116,066</td>
<td width="101">66,992</td>
<td width="87">44,879</td>
<td width="88">30,494</td>
</tr>
</tbody>
</table>
&nbsp;

[/accordion_item]

[accordion_item title="Treated Water Distributed"]

The dry weather in June and July produced an early peak in demand and a longer than average period of high demand. There was a dry Autumn but ground water levels recovered well in the Winter. January was very dry and the ground water recession started early. Luckily there was above average rainfall in February and ground water levels recovered for a second time to above average conditions. Average demand for the year was 174.58 Ml/d.

<a href="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/dist20189.png"><img class="aligncenter wp-image-9037 size-full" src="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/dist20189.png" alt="" width="671" height="461" /></a>

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[/accordion_item]

[accordion_item title="Leakage"]

For the year 2018/19 average leakage is calculated (post MLE) at 28.12 Ml/d. This is against the target of 29.85 Ml/d. 2018/19 was a good year for leakage control with the introduction of new technology and new techniques.

<a href="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/leakage20189.png"><img class="aligncenter wp-image-9038 size-full" src="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/leakage20189.png" alt="" width="668" height="370" /></a>

The harsh winter of 2018 led to a 4.0 Ml/d rise in leakage in late 2017/18 that would need to be recovered during 2018/19. Consequently, a successful leakage recovery plan was put in place aimed at innovating through collaboration to reduce leakage by 7.0 Ml/d from April 2018 to March 2019. Specifically:-
<ul>
 	<li>Noise correlators to improve leakage detection efficiency, listening for leaks in real-time on 25% of its network.</li>
 	<li>Flow and pressure logging and software to improve network understanding.</li>
 	<li>Specialist leakage detection technician resources</li>
 	<li>Leakage management, analysis and consultancy</li>
 	<li>Improvements to repair processes and techniques</li>
</ul>
[/accordion_item]

[accordion_item title="Burst Mains"]

The number of burst mains experienced in 2018/19 was 347, exactly the same as 2017/18, compared to our annual target of 342.  It equates to 104 bursts per 1,000km in the reporting year.

A large number of bursts occurred in the summer of 2018 as the long dry period continued into the early autumn. This measure is very dependent on weather conditions.

<a href="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/burstpipes20189.png"><img class="aligncenter wp-image-9039 size-full" src="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/burstpipes20189.png" alt="" width="897" height="474" /></a>

[/accordion_item]

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<a href="https://www.portsmouthwater.co.uk/wp-content/uploads/2019/11/WRMP-Annual-Review-June-2019.pdf">To view a copy of the Annual Review for 2019, please click here</a>

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