This can pass…
Try and get a morning or evening photo over the lake (similar to where this one taken). The main photo can be made very appealing (sunset / sunrise /blue skies)
Talk up the history of the PARK of which the lake is the central feature… Lake surrounded by community park land. The park and lake formed following major remediation of the former X mine in year blah. Mining commenced once the local canal was built in blah. Now used as recreational community park.
You can include in supporting Evidence for exercise include it being part of a ramblers walk. Numerous birding articles talk to its place for birdwatchers. Find all evidence of locals using it for recreation and sport etc etc. Get the links
My advice is gather all your supporting information. Get the right photos. You can take photos earlier and upload in nomination. When you make your nomination. Select upload later. Go to wayfarer. Go to your submissions. Now upload. Refresh my submissions - when your nomination appears put the nomination on hold. Now you can fine tune the title text supporting text.
DO NOT place the pin on the lake. Start supporting information with Great place to explore, exercise and socialise. Seen in Google STreet view and aerial. Evidence of history here (link) Evidence of exercise (link here and here) - include link to here and just say - according to Niantic Criteria Clarification community parks such as this can meet criteria as a valid waypoint Parks & Outdoor Recreation - Criteria Clarification Collection - Niantic Wayfarer Community
PS - ensure evidence linked in supporting - there is a wiki page… then this is the history of the mine and land - British Mining No 55 Memoirs 1995 pp41-46) Go to your local library. Even write to council and ask if any evidence of history. Don’t say for a game. Just say you interested in history etc etc Or write to the withymoor community association… There may even be great supporting info from the local Withymoor facebook page (or photos of activities (link to them))
Before release hold. Copy and paste nomination in nomination support and ask for help on it passing. Often will get great advice 
My advice does not guarantee a pass. But I have done parks like this in the past. And I know with the right evidence and photos they can pass
Good luck @froshybb